Honest comparison. OpenSolar's design tool is free but charges fees per accepted proposal. Diaz Editor wins on offline work + battery design + predictable costs. Bonus: Diaz Editor also handles electrical, HVAC, plumbing, and structural work — OpenSolar is solar-only.
OpenSolar is strong for sales-driven installers who want online proposals + e-signature + CRM. Diaz Editor is strong for design-driven installers who want speed, offline work, and battery design. Different philosophies — choose based on where your bottleneck is (sales or execution).
For a sales-led residential install business, OpenSolar's workflow is well-built.
| Feature | Diaz Editor | OpenSolar |
|---|---|---|
| 3D roof design | ✓ | ✓ |
| Works offline | ✓ | — (cloud-only) |
| Battery system design | ✓ (full) | — (basic) |
| Branded proposals + e-signature | — (export to your tool) | ✓ |
| Built-in CRM | — | ✓ |
| Per-deal costs | €0 | — (proposal fee) |
| PDF permit pack export | ✓ | ✓ |
| Local language UI (NL/ES) | ✓ | ✓ (limited) |
| Lifetime license available | ✓ | — |
Source: OpenSolar public pricing page + Diaz Editor v0.3 changelog. Updated May 2026.
OpenSolar's exact fee per proposal depends on region and plan. The €15 estimate is conservative — for some markets it runs to €30+. Check their pricing page for your situation.
Diaz Editor wins on speed + battery + offline + predictable cost. No surprises at month-end.
OpenSolar's all-in-one workflow may fit better. CRM + proposal + signature in one tool is valuable if sales is your bottleneck. Some installers use both: Diaz Editor for design, OpenSolar (or their own CRM) for sales flow.
OpenSolar's design tool is free, but they charge per accepted proposal (transaction fee model) and offer paid add-ons (CRM, e-signature, payments). For high-volume installers, the proposal fees add up quickly. Diaz Editor has zero transaction fees.
Yes. Diaz Editor is a desktop application — works fully offline. OpenSolar is cloud-only. If your internet is down or you're at a remote site, Diaz Editor keeps working.
Export your OpenSolar projects as PDF + CSV. Re-create in Diaz Editor in 5-15 minutes per residential project. The roof traces are typically the longest part — Diaz Editor's roof tools speed this up.
OpenSolar's branded proposal generator is one of its strengths. Diaz Editor's PDF export is more design-focused (technical permit pack). For sales-pitch documents, you'd combine Diaz Editor's 3D output with your own proposal template.
OpenSolar's strength is the sales workflow — branded proposals, e-signature, CRM. If sales is your primary bottleneck, OpenSolar may fit. If design speed and offline desktop work matter more, Diaz Editor is the better tool.
100 founding spots. No subscription. No transaction fees.
Claim founding spot — €99One-time. Lifetime. 3 seats. No subscription.
Built for self-employed tradespeople + small teams (1-10 people). Not for architects or utility-scale engineering — AutoCAD and Aurora are better at those.
Regular price (after founding):
€1.000 €99 today
100 spots total. Stripe checkout. Instant download after payment.