OpenSolar Review 2026: Pricing, Pros, Cons, Alternatives

Start here if OpenSolar is on your shortlist

OpenSolar earns its money with a residential solar installer running roughly 1 to 25 designers, closers and office staff on rooftop retrofit and battery attach work, where the same tool has to produce the design, the interactive proposal, the finance comparison and the deposit request, and where paying nothing for seats matters more than owning a two-way accounting sync. If that's you, it does the job. The sections below are the parts worth checking before you sign. But the fit is narrower than the marketing suggests, and the price isn't the whole cost.

It starts at $0. And pricing was verified on 7 August 2026, so you can check every figure below in a browser tab.

OpenSolar: right buyer, wrong buyer

It fits a residential solar installer running roughly 1 to 25 designers, closers and office staff on rooftop retrofit and battery attach work, where the same tool has to produce the design, the interactive proposal, the finance comparison and the deposit request, and where paying nothing for seats matters more than owning a two-way accounting sync. That's the half most reviews print. Here's the other half, which is the one worth your time.

Don't buy it if you're Any contractor who isn't doing solar. Roofers, HVAC shops, remodelers and electricians without a PV arm.. OpenSolar is built entirely around the solar object model: modules, inverters, batteries, racking, shading, tariffs, incentives, STC and MACRS. And there's no generic job type. The trade taxonomy on the platform is solar and adjacent electrification (batteries, EV chargers, heat pumps), so a roofing crew would be fighting the data model on day one. Look at JobNimbus instead.

Don't buy it if you're A solar business whose bookkeeper works inside QuickBooks or Xero and expects the two systems to stay in step both ways.. The Xero usage guide states 'Direction: One-way from OpenSolar to Xero', and QuickBooks Online behaves the same way. And corrections made in the accounting package never flow back. On top of that, the connector is a $49 USD a month subscription on a platform sold as free, and the Enterprise Services page separately lists 'Accounting integrations' as an Enterprise-plan inclusion, so which envelope it belongs in is genuinely unclear until you ask. Look at Aurora Solar instead.

Don't buy it if you're A dealer or EPC building a real integration between OpenSolar and Salesforce, NetSuite or a proprietary ops system on a fixed budget.. API access became paid on 17 March 2026 and is billed per project created, and the fee isn't published in any of the three places OpenSolar discusses it. And worse, the contractual fair-use limits in the terms and the published throttle limits in the developer docs describe different ceilings, so the cost and the technical envelope of the integration are both unknown until you're in a sales conversation. Look at Aurora Solar instead.

Don't buy it if you're A team that needs a dependable offline-tolerant field app for site surveys and in-home closing on phones.. The app carries repeated blank-screen and login-loop reports across the US, UK and Australian storefronts spanning 2019 to 2026, and the most recent Android review says 'Very buggy for Android. Pretty good for Pc Web browser'. And the web platform is the strong half of this product. Look at CompanyCam instead.

The money question on OpenSolar

The tiers are public. And that's worth more than it sounds in a category where half the vendors make you ask.

There is no per-seat price at all on the core product, which is the single most unusual thing about OpenSolar's economics in a category where Aurora Solar and HelioScope both bill per license. The vendor states it plainly: 'We pride ourselves as a free of charge platform that will always be free for you to use' and 'OpenSolar works with partners who all pay us to be a part of the platform, making OpenSolar free for solar professionals.' The meters that do exist are not seats. Two of them are per-project: API Access is 'billed as a per-project fee' applied 'when you create a project', and premium Nearmap imagery is bought per roof out of a prepaid Wallet. Two of them are flat per-account: the Xero or QuickBooks connector at $49 USD a month, and the Enterprise Services plans at US$500 and US$1,350 a month. So headcount never moves your bill, but project volume does the moment you want your data in another system.

There is a discount for paying annually up front: No annual discount is published, and there is no annual plan to discount. The core platform is free, the Accounting Connectors are described as a 'flat monthly subscription', and the two priced Enterprise Services plans are both quoted '/ month' with no annual toggle on the page. The only volume mechanism disclosed anywhere sits inside CashFlow, where the transaction-rate articles say 'Volume discounts may be available - speak to your account manager for more details' without naming a threshold or a rate. And an annual prepay discount tells you an annual commitment exists, which is worth knowing before anyone mentions a term length out loud.

What a OpenSolar quote leaves out

Payment processing. CashFlow is the in-product payment rail and it is where OpenSolar's published pricing gets genuinely detailed. The framing is 'With CashFlow, you only pay when you get paid. There is no cost to signing up, and no recurring fees.' US rates: Credit Card Standard (US personal Visa and Mastercard) 2.9%, Credit Card Premium (all other US-issued credit cards) 3.25%, Credit Card International 4.0%, the same 2.9 / 3.25 / 4.0 ladder on debit, and ACH Direct Debit at 0.2% with a $15 cap per transaction. UK rates run much lower: 1.3% standard, 2.1% premium, 3.2% international, and bank transfers are 'Free'. AU rates are 1.5% standard, 1.7% premium, 3.4% international, with BECS Direct Debit at 0.3% capped at $15. Then there are the failure fees most installers will never model. A declined card authorisation costs $0.10. A first-time ACH payer costs a $1.50 account validation fee because 'Nacha, the US governing body for the ACH payment network, requires businesses to validate the bank account details of any consumer that sends them ACH payments.' A reversed ACH payment costs $15. A chargeback costs $25 USD / $25 AUD / £25 GBP, and fighting it costs a further $10 USD / $10 AUD / £10 GBP representment fee, which are 'non-refundable and will not be returned, regardless of the outcome of your representment.' Card payouts land 2 business days after approval in the US and 3 business days in the UK and AU.

Implementation and onboarding. No separate one-off implementation or onboarding fee is published, because onboarding is bundled into the monthly Enterprise Services plans rather than sold as a project. The US$500 a month Support plan is what carries 'Guided setup, faster response times, and hands-on support', and its inclusions list reads 'Process discovery session', 'Admin training', 'Team design training' and an 'Account setup' block covering company info, pricing scheme, cost scheme, adders, payment options, hardware favorites and contract and file template upload. Self-serve onboarding on the free platform costs nothing and comes with no committed setup help.

Minimum term. The free platform carries no minimum term, and the User Terms and Conditions say 'You may close your Account at any time.' Anything paid is different, because it sits under a separate Service Agreement whose term you do not see until you are shown it. Clause 5 says a Service Agreement will set out 'the start date for the Service Agreement and any applicable term during which the services will be provided' and 'the fees payable for any services and the payment terms for those fees (set out in the respective Fee Schedule)', and that 'Each Service Agreement will commence at the time that you click "agree"'. The public terms never state a default minimum, so the term is whatever the unpublished Fee Schedule says.

Getting out. There is no published early-termination percentage or buyout figure. The terms push it into the per-service paperwork: 'You may terminate the Additional Services as set out in the terms of the respective Service Agreement, and you will be liable for Fees due and owing, as set out in the respective Service Agreement.' Breach is treated more aggressively. If OpenSolar closes your account for breach, 'you must pay us all fees owed to us and reimburse us for all losses and costs (including any and all of our employee time) and reasonable expenses (including legal fees) related to investigating such breach and collecting such fees.'

Auto-renewal. Ask for the actual Service Agreement and Schedule A Fee Schedule before you click agree on any paid product, and ask three things of it in writing: does the term auto-renew, what notice window cancels it, and what happens to the Enterprise Services customisations (bespoke proposal templates, custom forms, custom documents, showcase components) if you stop paying. And the public terms define 'Fees Schedule' as 'Schedule A of a Services Agreement which sets out the fees payable by you' and never publish one, so renewal mechanics are invisible until you're inside the flow.

Modules sold separately. , , , , , , , . But the entry tier is not the price you'll pay. Add the modules your shop needs on day one and compare OpenSolar on that total.

Third-party services you will also pay for. , , , . These are not on OpenSolar's invoice, and they are still part of what this decision costs you every month.

The OpenSolar costs that land afterwards

The subscription is the part everyone quotes. These are the lines that land afterwards, and the ones we could not find are named as unpublished rather than left blank.

Sold separately. , , , , , , , . Price the configuration you'll really run, because an add-on you need on day one is part of the price.

Third-party services you'll also pay for. , , , . None of these are on OpenSolar's invoice, and all of them are part of what this decision costs every month.

The five workflows you pay for

Feature totals are noise. So a shop in this category lives or dies on five things, and those are the five to grade, and each one below carries the evidence it's graded on.

The whole product is arranged so a roof becomes a signable, financed proposal in one sitting, and the free tier is the complete version of that path Auto Design, Mounting Designer and Single Line Diagrams sit on the design side; Sales Machine Proposal, Integrated Finance, CashFlow and E-signature sit on the sell side; Shop and Bill of Materials, Supplier Assist, Expo, Project Management CRM and On-demand Permitting sit on the manage side. And none of those are gated behind a paid tier. The vendor's own framing on the API page is 'OS 3.0 is a full solar operating system offered free of charge. Use the API when you choose to run workflows in third-party systems and move data in and out of OpenSolar.' In other words, staying inside OpenSolar is free and leaving it is what costs money.

Finance is a market-by-market grid of 20 named lenders, not a single global rail The Integrated Finance page splits the world four ways. The UK gets a Finance Marketplace (Propensio Finance, Selina, Hometree Finance, Smart Ease) framed as a way to 'Offer flexible financing without the cost or regulatory burden of becoming a credit broker'. The US gets direct lender and TPO options (Deep Green Solar, Dividend Finance, Energy Loan Network, EnFin, Figure HELOC, Goodleap, LightReach, Sungage, Sunlight Financial). Australia gets 28Watt, Handypay, Humm, LoanOptions.ai, Parker Lane, Plenti and Smart Ease. And Germany gets Cloover alone. The vendor is explicit that it takes no credit risk: 'No. OpenSolar connects the proposal to supported finance providers and marketplace options. Finance products, rates, applications, approvals, and agreements are handled by the finance provider.' But dealer fees are yours to model, and OpenSolar gives you a percentage field, a fixed-dollar field and a Dealer Fee Adjustment that decides how much of it the customer sees.

CashFlow is the most transparently priced thing OpenSolar sells, and the surcharge switch is the decision that matters You configure payment methods per milestone, so the deposit can accept cards while the final balance is ACH or bank transfer only. And the lever that changes your margin is smart surcharging: 'When this is enabled on a payment method and the project’s region allows surcharging, the maximum allowable card fee is added onto the invoice amount for the customer to pay. If surcharging is not applied to a payment method, the payment method fee is deducted from the original invoice amount upon payout.' Australia adds a regulatory constraint: 'AU regulations require merchants to offer at least one payment method that does not include a surcharge. As a result, the BECS Direct Debit payment method is ineligible for surcharging.' And UK bank transfers are free and instant; US ACH is 0.2% capped at $15 but takes 3 business days to approve and 2 more to pay out.

Getting data out is possible but rationed three different ways: a 2,000-row export cap, a paid per-project API, and a one-way accounting push The CSV route is free, admin-gated for the full field set, and truncates silently at 2,000 projects. The API route is paid per project created and its fee is unpublished. The accounting route pushes invoices and payments to Xero or QuickBooks for $49 a month and never reads back. And there's also a DXF export for CAD. So taken together, an installer can leave OpenSolar with their project list, but reconstructing designs, proposal history and payment records elsewhere is real work rather than a button.

The Shop is where OpenSolar's revenue model becomes visible, and the vendor says so out loud The help centre article on the Solar Outlet hardware ordering partner doesn't dress it up: 'Help OpenSolar stay free. OpenSolar generates revenue through partnerships and integrations, so whenever you put an order through with Solar Outlet, OpenSolar gets a small portion of the total order amount.' And there are stated incentives for routing procurement through the platform, including a 0.5% rebate for every $5,000 ordered online and a $25 deposit per $5,000 transaction against pay-per-project premium imagery. So that's a clean, honest disclosure, and it also tells you exactly whose interests shape the roadmap.

OpenSolar trade fit

The OpenSolar integration that decides everything else

Xero connects one way only, so edits made in your books do not come back, gated to a higher tier. QuickBooks Online connects one way only, so edits made in your books do not come back, gated to a higher tier. Accounting Connectors (pricing, both connectors) connects one way only, so edits made in your books do not come back, gated to a higher tier. Your costs map through cost codes, so test yours against your own chart of accounts before you commit. A code your books don't recognise is how a labour charge quietly lands somewhere useless.

Past those, the road ends. Any accounting package other than Xero and QuickBooks Online, A publicly countable integrations directory, Two-way sync with anything, A published price for API Access do not connect. So if your books run on an ERP rather than the platforms named above, weigh that before anything else.

Beyond accounting it connects to Stripe (Payment processing behind CashFlow for integrated online payments, replacing BlueSnap for new customers), Nearmap (Premium high-resolution 2D and 3D imagery bought per project out of the OpenSolar Wallet), MetroMap and 3D Plus (The other two Imagery Marketplace providers, priced per image and not published), SolarAPP+ (Automated residential permitting submission in participating US jurisdictions), UtilityAPI (Pulling homeowner utility interval usage data into the design, US only), Solar Outlet (Solar Juice) (Hardware ordering and bill-of-materials fulfilment from inside the design, Australia), Palmetto / LightReach (Third-party ownership (TPO) lease and PPA origination from the proposal, US), Bridge Select (STC (small-scale technology certificate) claiming, Australia), Amber Electric (Wholesale-price savings modelling for Australian battery proposals), Finance partner directory (20 lenders counted) (Named finance providers listed in the Integrated Finance directory grid). A public API exists: A REST API at https://api.opensolar.com/api/ covering organizations and projects, systems and designs, contacts, roles and workflows, pricing, payments and costing, the hardware component catalog, incentives and tariffs, teams and sharing, plus events, IDs and webhooks. It became a paid product on 17 March 2026 under two plans. API Access is core access where 'Some endpoints return a reduced set of data' (the System Details response omits custom_data and the Projects design field 'is omitted or null'). Raw Data API Access returns 'full design-related data where applicable'. Both carry a 30-day free trial and both are billed as a per-project fee applied at project creation, deducted from the OpenSolar Wallet, with an unfunded Wallet blocking new projects entirely. Documented throttle limits include 10 project creations per minute per user against 10,000 per day per org, and 100 project reads per minute per user. Note that the User Terms and Conditions state a different and much tighter fair-use ceiling: 1,000 Google Solar API calls per calendar month, 200 per calendar day, and 2,000 webhook calls per calendar month.

OpenSolar support, and what it costs you

The OpenSolar term, and what leaving costs

Nobody reads this section before they buy, and it's the one that costs money afterwards. Four terms decide what leaving looks like.

Minimum term. The free platform carries no minimum term, and the User Terms and Conditions say 'You may close your Account at any time.' Anything paid is different, because it sits under a separate Service Agreement whose term you do not see until you are shown it. Clause 5 says a Service Agreement will set out 'the start date for the Service Agreement and any applicable term during which the services will be provided' and 'the fees payable for any services and the payment terms for those fees (set out in the respective Fee Schedule)', and that 'Each Service Agreement will commence at the time that you click "agree"'. The public terms never state a default minimum, so the term is whatever the unpublished Fee Schedule says.

Auto-renewal. Ask for the actual Service Agreement and Schedule A Fee Schedule before you click agree on any paid product, and ask three things of it in writing: does the term auto-renew, what notice window cancels it, and what happens to the Enterprise Services customisations (bespoke proposal templates, custom forms, custom documents, showcase components) if you stop paying. And the public terms define 'Fees Schedule' as 'Schedule A of a Services Agreement which sets out the fees payable by you' and never publish one, so renewal mechanics are invisible until you're inside the flow.

Early termination. There is no published early-termination percentage or buyout figure. The terms push it into the per-service paperwork: 'You may terminate the Additional Services as set out in the terms of the respective Service Agreement, and you will be liable for Fees due and owing, as set out in the respective Service Agreement.' Breach is treated more aggressively. If OpenSolar closes your account for breach, 'you must pay us all fees owed to us and reimburse us for all losses and costs (including any and all of our employee time) and reasonable expenses (including legal fees) related to investigating such breach and collecting such fees.'

Payment processing. CashFlow is the in-product payment rail and it is where OpenSolar's published pricing gets genuinely detailed. The framing is 'With CashFlow, you only pay when you get paid. There is no cost to signing up, and no recurring fees.' US rates: Credit Card Standard (US personal Visa and Mastercard) 2.9%, Credit Card Premium (all other US-issued credit cards) 3.25%, Credit Card International 4.0%, the same 2.9 / 3.25 / 4.0 ladder on debit, and ACH Direct Debit at 0.2% with a $15 cap per transaction. UK rates run much lower: 1.3% standard, 2.1% premium, 3.2% international, and bank transfers are 'Free'. AU rates are 1.5% standard, 1.7% premium, 3.4% international, with BECS Direct Debit at 0.3% capped at $15. Then there are the failure fees most installers will never model. A declined card authorisation costs $0.10. A first-time ACH payer costs a $1.50 account validation fee because 'Nacha, the US governing body for the ACH payment network, requires businesses to validate the bank account details of any consumer that sends them ACH payments.' A reversed ACH payment costs $15. A chargeback costs $25 USD / $25 AUD / £25 GBP, and fighting it costs a further $10 USD / $10 AUD / £10 GBP representment fee, which are 'non-refundable and will not be returned, regardless of the outcome of your representment.' Card payouts land 2 business days after approval in the US and 3 business days in the UK and AU.

OpenSolar, from the people who bought it

The realistic shortlist against OpenSolar

Here's the shortlist OpenSolar competes against in real deals. Some of these will tell you the price tonight. That difference tells you how the sales conversation is going to go.

Aurora Solar. LIDAR-assisted modelling, bankable shade reports that survive lender underwriting, and battery modelling for backup, self-consumption and arbitrage. And it's the tool most US lenders recognise on sight. But Costing anything at all. A three-designer shop pays roughly $5,700 a year on Basic monthly before any add-on, where the same three designers pay nothing on OpenSolar, and Aurora meters projects per seat on top of the seat price.

HelioScope. Commercial and industrial PV simulation. The Basic plan claims 'Accuracy within 1% of PVsyst' and designs up to 1.25 MW DC, with the Pro plan at $259 USD a month reaching 5 MW DC and Enterprise reaching 30 MW DC with PVsyst export. But Residential sales. There's no CRM, no proposal-to-payment rail and no finance marketplace, and the 10-projects-per-month license cap is brutal for a residential shop that opens dozens of addresses a week.

Solargraf. Publishing a fully worked annual price with the overage rates attached, which almost nobody in this category does. And every plan includes proposals, shading, permitting, financing and CRM, and Enterprise at $12,999 USD a year includes public API access that other plans buy at $4,000 annually. But Sunk cost. You commit a year up front against a project and user allowance, where OpenSolar charges nothing until you touch imagery, the API or the accounting connector.

Pylon. Being the honest middle. And it runs the same per-project economics OpenSolar runs on imagery and API, but it publishes the number on a page headed 'Simple, transparent pricing. Only pay for what you use', where OpenSolar makes you start a trial to learn its per-project API fee. But Breadth of the free surface. Pylon charges per project from the first design; OpenSolar's design, proposal, CRM, e-signature, permitting and bill-of-materials workflow costs nothing at all.

Who should not buy OpenSolar

Don't buy OpenSolar if you're Any contractor who isn't doing solar. Roofers, HVAC shops, remodelers and electricians without a PV arm.. OpenSolar is built entirely around the solar object model: modules, inverters, batteries, racking, shading, tariffs, incentives, STC and MACRS. And there's no generic job type. The trade taxonomy on the platform is solar and adjacent electrification (batteries, EV chargers, heat pumps), so a roofing crew would be fighting the data model on day one. Look at JobNimbus instead.

Don't buy OpenSolar if you're A solar business whose bookkeeper works inside QuickBooks or Xero and expects the two systems to stay in step both ways.. The Xero usage guide states 'Direction: One-way from OpenSolar to Xero', and QuickBooks Online behaves the same way. And corrections made in the accounting package never flow back. On top of that, the connector is a $49 USD a month subscription on a platform sold as free, and the Enterprise Services page separately lists 'Accounting integrations' as an Enterprise-plan inclusion, so which envelope it belongs in is genuinely unclear until you ask. Look at Aurora Solar instead.

Don't buy OpenSolar if you're A dealer or EPC building a real integration between OpenSolar and Salesforce, NetSuite or a proprietary ops system on a fixed budget.. API access became paid on 17 March 2026 and is billed per project created, and the fee isn't published in any of the three places OpenSolar discusses it. And worse, the contractual fair-use limits in the terms and the published throttle limits in the developer docs describe different ceilings, so the cost and the technical envelope of the integration are both unknown until you're in a sales conversation. Look at Aurora Solar instead.

Don't buy OpenSolar if you're A team that needs a dependable offline-tolerant field app for site surveys and in-home closing on phones.. The app carries repeated blank-screen and login-loop reports across the US, UK and Australian storefronts spanning 2019 to 2026, and the most recent Android review says 'Very buggy for Android. Pretty good for Pc Web browser'. And the web platform is the strong half of this product. Look at CompanyCam instead.

The verdict, by shop size

Owner-operator to 5-person residential solar shop

Yes, and this is the shape the product is built for. At this size the seat-price arithmetic is the whole decision, and OpenSolar wins it by default. Design, proposal, CRM, e-signature, permitting and bill of materials cost nothing, where Aurora Solar's Basic plan would be about $1,908 a year for one designer and HelioScope the same. And the paid edges barely apply: you're unlikely to need the API, the free base imagery covers most suburban roofs, and CashFlow only charges when money moves. So the one thing to do on day one is set up the Wallet with auto top-up so a premium-imagery purchase never stalls a live design, and export your projects to CSV once a quarter so the two-day termination clause stays theoretical. This band runs 1 to 5 on the crew, doing residential work, and that's the profile the recommendation is written for.

6 to 25 designers and closers, residential and light commercial, still running one system of record

Only under conditions, and they are worth being honest about. The free platform still scales here, because nothing is priced per seat. But what changes is that the paid edges start firing. Once your bookkeeper wants invoices in Xero, that's $49 USD a month. Once you want a 2-hour SLA and a named contact, that's US$500 a month, which is still less than four Aurora seats. And the condition is the accounting sync: it's one-way, so decide before you commit whether OpenSolar or the accounting package is the source of truth for invoice status, because you'll be reconciling by hand in one direction forever. Also budget for the mobile app being the weak half, and keep the field workflow on tablets or laptops until you've tested the app on your reps' actual phones. This band runs 6 to 25 on the crew, doing residential and commercial and service work, and that's the profile the recommendation is written for.

Multi-branch or dealer-network solar business integrating OpenSolar with Salesforce, NetSuite or a proprietary ops stack

No. This is the band where free stops being the relevant number. Your integration is the product, and OpenSolar's API went paid on 17 March 2026 at a per-project fee it doesn't publish anywhere, with an unfunded Wallet able to block project creation outright. And on top of that, the contractual fair-use ceiling in the User Terms (1,000 Google Solar API calls a month, 2,000 webhook calls a month) and the published throttle limits in the developer docs (10,000 project operations a day per org) describe different systems, so nobody quoting your build can size it honestly. Then read clause 18: OpenSolar can terminate 'at any time by giving you two days’ notice in writing', and clause 13 lets it close your account 'at any time without reason' with 'no claim whatsoever against us'. So a business whose revenue runs through a bespoke integration shouldn't sit on a two-day notice period with an unpriced meter attached. Price Aurora Solar's Enterprise tier against it and pay for the contract you can plan around. This band runs 26 or more on the crew, doing residential and commercial work, and that's the profile the recommendation is written for.

Non-solar home-services contractor evaluating OpenSolar because it's free

No. Free isn't a reason to adopt a tool built around modules, inverters, batteries, racking, shading, tariffs, STC and MACRS. And there's no generic job object in OpenSolar. A roofing, HVAC or restoration shop would spend more time bending the data model than it would ever save on licence fees, and none of the integrations (SolarAPP+, UtilityAPI, Solar Outlet, Bridge Select, twenty solar lenders) do anything for a non-solar job. This band runs 1 or more on the crew, doing residential and service and insurance work, and that's the profile the recommendation is written for.

Our OpenSolar sources, and their limits

And here's what we can and can't stand behind on OpenSolar. The basis is 40 vendor pages for OpenSolar, read on 7 August 2026, and every review we could retrieve, sorted by complaint. Pricing was verified the same day, and every figure above traces to a page we opened.

So: 14 quotes on this page, three from Google Play, 3 stars, two from Google Play, 5 stars, two from Google Play, 2 stars, one from Apple App Store (US storefront), 5 stars, review title "OpenSolar is fantastic", one from Apple App Store (US storefront), 3 stars, review title "Worked great - for one day", one from Apple App Store (US storefront), 1 star, review title "Can’t be used without an account", one from Apple App Store (UK storefront), 1 star, review title "Blank screen", one from Apple App Store (UK storefront), 5 stars, review title "Amazing", one from Apple App Store (AU storefront), 1 star, review title "Doesn’t work at all" and one from Google Play, 1 star.

And Capterra: direct curl returns HTTP 403. Guessed product URL https://www.capterra.com/p/181802/OpenSolar/reviews/ returned 404 via WebFetch, https://www.capterra.com/search/?q=OpenSolar renders results client-side and returned only loading text, and OpenSolar doesn't appear in the 30 products listed on https://www.capterra.com/solar-software/. No Capterra review pool located., Software Advice: direct curl returns HTTP 403. https://www.softwareadvice.com/solar/opensolar-profile/ returned 404 and OpenSolar isn't among the 45 products on https://www.softwareadvice.com/solar/. No Software Advice profile located., GetApp: direct curl returns HTTP 403. https://www.getapp.com/all-industries-software/a/opensolar/reviews/ returned 403 and OpenSolar isn't among the 38 products on https://www.getapp.com/operations-management-software/solar/. Note that Capterra, Software Advice and GetApp are all Gartner properties reading one review pool, so their absence is one missing source, not three., https://support.opensolar.com/hc/en-us (HTML help centre) returns HTTP 403 to both curl and WebFetch; the underlying Zendesk REST API at /api/v2/help_center/ was open and was used instead, https://www.opensolar.com/partners/ 301s into the authenticated app at https://app.opensolar.com/expo, so the full partner and integration roster is behind login and couldn't be counted, G2, TrustRadius, Trustpilot and Reddit weren't reachable for quotation and no content from them appears in this bank and DuckDuckGo HTML, DuckDuckGo Lite, Bing and Mojeek all returned zero usable result links for site-scoped review-platform queries refused automated retrieval for OpenSolar. Forum and social threads are the ones people most want quoted, and they are exactly the ones we cannot verify, so none of them are here.

What that leaves untested: the OpenSolar app itself, which requires a Pro account, so no first-hand verification of the reported blank-screen and login-loop behaviour. And everything above is 40 vendor pages and a review corpus, which is documentary rather than hands-on.