ClosaraOpen-source and self-hosted Sellsy alternatives
Sellsy sells modules. Closara installs one complete CRM at your place, with no boxes to tick.
The open-source CRMs that replace Sellsy
Sellsy is proprietary software offered as SaaS: it does not install on your server. These CRMs do; the licence is read from their public repository.
| CRM | Licence | Language | Source code |
|---|---|---|---|
| EspoCRM | AGPL-3.0 | PHP | github.com/espocrm/espocrm |
| SuiteCRM 8 | AGPL-3.0 | PHP | github.com/SuiteCRM/SuiteCRM-Core |
| Odoo Community | LGPL-3.0 | Python | github.com/odoo/odoo |
| Twenty | AGPL-3.0 (some files under a commercial licence) | TypeScript | github.com/twentyhq/twenty |
| Closara | Proprietary, source code delivered (not an OSI licence) | Node.js, SQLite | - |
Licences checked on 2026-09-24 in each public repository's licence file. All of them install on your own server; so does Closara, but its code is delivered under a proprietary licence.
Sellsy and Closara, line by line
| Sellsy | Closara | |
|---|---|---|
| Hosting | SaaS, on the vendor's servers | Your server or your VPS |
| Code licence | Proprietary, code not published | Proprietary, source code delivered (not an OSI licence) |
| Billing model | Per user, with modules (CRM, invoicing, cash, marketing) each adding to the bill. | One tier plus modules, unlimited seats |
| Price | Sellsy pricing page | Closara pricing |
No price is copied here: prices change without notice. We compare billing models, and each column links to the original pricing page.
How Sellsy bills
Per user, with modules (CRM, invoicing, cash, marketing) each adding to the bill. French vendor, French hosting.
What keeps you on Sellsy
Lock-in is almost never a contract clause. It is accumulated work you cannot take with you.
- Modules sell separately and rejoin poorly elsewhere.
- Commercial and accounting documents create a long dependency.
- Vendor-hosted.
What Closara does instead
- On your server, not in their cloud
- No per-seat subscription
- The AI runs locally
- White-label included
- The code and the database are yours
Details, the demo and pricing are on the Closara page.
Migrating from Sellsy to Closara
Exports are per module; the difficulty is rebuilding links between quotes, invoices and deals.
- Read before writing: a full Sellsy export is loaded read-only into Closara. Nothing is deleted on their side, nothing is irreversible.
- One week in parallel: the team works in both tools for seven days. Deliberately short: beyond that, nobody keeps it up and the data diverges.
- Move the users: accounts move to Closara, running sequences are replayed at the same cadence, meetings follow.
- Cancel, not before: the Sellsy subscription stops once a full week has run without falling back. Keep a dated export: that is your safety net.
When you should stay on Sellsy
If you want a complete French suite from quote to collections, Sellsy is broader than Closara on paperwork.
We would rather lose a sale than install a tool nobody will use. A migration costs team time, and that time never comes back.
Frequently asked questions
Is there an open-source alternative to Sellsy?
Yes: EspoCRM (AGPL-3.0), SuiteCRM 8 (AGPL-3.0), Odoo Community (LGPL-3.0) and Twenty (AGPL-3.0, some files under a commercial licence) are open source and install on your own server (licences checked in their repositories on 2026-09-24). Closara is not open source: it is a self-hosted CRM whose code is delivered to you, with local AI and unlimited seats.
Is Sellsy open source?
No. Sellsy is proprietary software hosted by its vendor: you can export your data, but you cannot audit the code, install it in-house, or modify its code.
Can you self-host Sellsy?
No. No edition of Sellsy installs on your infrastructure. If self-hosting is your criterion, the answer is not to negotiate with them but to change tool category.
How do you migrate from Sellsy to Closara?
Exports are per module; the difficulty is rebuilding links between quotes, invoices and deals. The switch happens in four steps: pull the data read-only, run one week of outbound in parallel, move the users, then shut the old tool down. Nobody works in two tools for more than seven days.
Is Closara cheaper than Sellsy?
It depends on your headcount, and we do not quote their prices: they change. Sellsy applies its own model, described on its pricing page; Closara charges one tier plus modules, never the number of users, and hosting it yourself is free. Run the numbers with your seat count on Closara's pricing page, which compares the two models.
What data can you export from Sellsy?
Exports are per module; the difficulty is rebuilding links between quotes, invoices and deals.
When should you stay on Sellsy?
If you want a complete French suite from quote to collections, Sellsy is broader than Closara on paperwork. We would rather say it plainly: a failed migration costs more than a subscription.
The other comparisons
More on self-hosted CRMs
Written by Skander Mallek, founder of INEYA Studio, which builds Closara. Reviewed and updated on 2026-09-24. For information only, not advice: check pricing and features with the vendor before deciding.
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