Best Open-Source CRM in 2026

"Open source" is doing a lot of work in this category. Two projects can both call themselves open-source CRM and mean completely different things by it — one you can fork and sell, one that obliges you to publish your changes, one where the feature you actually need lives in a directory you have to pay for. The licence is the most consequential line in any of these comparisons, and it's usually the line the comparison skips.

What is the best open-source CRM in 2026?

There isn't one winner. Twenty is the best-looking modern CRM and the easiest to like. EspoCRM is the fastest on cheap hosting. SuiteCRM is the most customisable for enterprise sales processes. Odoo wins if you need ERP breadth. Munin is the pick if you want a whole customer platform under a permissive MIT licence that AI agents can operate directly.

Which you should choose depends on one question: do you need a sales pipeline, or do you need the whole customer relationship? Most of this category answers the first. Below is what each one actually licenses you to do.

Which open-source CRM licences are actually permissive?

Almost none of them. Twenty, EspoCRM, and SuiteCRM are all AGPL-3.0, a strong copyleft licence — fine for internal use, but if you modify the code and offer it as a hosted service, you can be obliged to publish your changes. Several also gate real features behind a separate proprietary package. Munin is MIT throughout, with no paywalled directory.

This is worth being precise about, because the difference decides what you're allowed to build:

• AGPL-3.0 + commercial escape hatchTwenty, EspoCRM, and SuiteCRM. EspoCRM moved from GPLv3 to AGPLv3 and sells a commercial licence explicitly as the alternative for organisations that want out of copyleft. If AGPL is a problem for you, the fix is a cheque.
• Open coreTwenty's community edition is AGPL-3.0, but SSO, advanced RBAC, and lifecycle permissions sit in a separate twenty-ee package under a custom licence rather than AGPL. The features an actual company needs are the ones on the other side of the line.
• Community + proprietary Enterprise editionOdoo. The community edition is genuinely open source; the Enterprise edition is not, and the cloud plans get expensive.
• MIT, no enterprise directoryMunin. Permissive, no copyleft obligation, and the suite in the public repo is the same code we run in Cloud.

Is Twenty a good open-source CRM?

Yes — Twenty is the strongest pick on this list if a sales pipeline is all you need, and the one we'd recommend for that job. It has the most modern interface in the category, ships both GraphQL and REST so it's clean to integrate, serves an MCP server on every plan including self-hosted, self-hosts via Docker, and has one of the largest followings of any modern open-source CRM. Its constraint is scope: it's a CRM, not a customer platform.

The cost case for self-hosting is also genuinely strong. An Open Source Alternatives analysis put Twenty self-hosted at roughly $4,500–$10,800 over three years — VPS at $20–40 a month, implementation costed at $100 an hour, and two to five hours a month of maintenance — against $86,000–$132,000 for Salesforce Enterprise over the same period. Treat those as indicative rather than a quote, but the gap is the entire reason this category exists, and it holds for any of the self-hosted options here.

On Twenty's own pricing page the hosted plans are $9 per user per month for Pro and $19 for Organization, which adds row-level permissions and SSO; Enterprise starts at $50,000 a year. Where it stops: AGPL-3.0, with SSO and advanced permissions in the separately licensed twenty-ee package. And no knowledge base, no support inbox, no CMS — so if your customer record needs to be shared with the people answering support tickets, you're back to running two systems and syncing them.

What about EspoCRM, SuiteCRM, and Odoo?

Each is the right answer to a narrower question. EspoCRM is fast, simple, and performs well on lightweight hosting — the pick when you want something responsive on a cheap VPS. SuiteCRM is the most customisable, with enterprise-grade modules across sales, marketing, service, and operations; it's the traditional open-source Salesforce replacement, and the full Salesforce comparison covers where it lands against the real thing. Odoo isn't really a CRM at all — its CRM is basic, but with 80+ modules it becomes an ERP, which is either exactly what you want or far too much.

All three are mature, all three have communities that will outlive any given vendor, and all three are worth your shortlist if what you need is the classic shape of a CRM. Each exposes a REST API an agent can be driven against, though in all three the API was designed for integrations first and a tool catalogue second.

What makes Munin different from the rest of this list?

Two things. Munin isn't only a CRM — CRM, knowledge base, CMS, outreach, conversations, and analytics run on one Postgres database with a single shared contact record. And the tool catalogue is the primary surface: 204 MCP tools at one endpoint covering all six modules, so Claude, Cursor, ChatGPT, or your own runner operates the platform directly rather than clicking through a UI.

The shared-record part is the less obvious win. Every other option on this list solves CRM and leaves support, content, and outreach to other software, which means a sync job and two versions of the truth about every customer. We put all six modules behind one schema with row-level security carrying tenancy precisely to avoid that, which is what keeps one customer visible across all six.

The agent part is the bet. If the cheapest operator of your systems is no longer a person, the UI stops being the product and the tool catalogue becomes the thing that matters. Munin is MIT-licensed because portability is a better moat than lock-in — every module has a matched export/import pair, so leaving is a sequence of tool calls.

Who should not pick Munin?

Three buyers, and the criteria are concrete rather than tonal. If you want a polished sales UI your team can open and understand in an afternoon, Twenty is built for precisely that. If you need sales forecasting, territory management, or quote-to-cash, SuiteCRM ships a decade of those modules and Munin ships none of them. If you need ERP, take Odoo. Munin's scope also stops short of a reporting suite: no SLA timers, no CSAT surveys, no manager dashboards.

What's left after those three is a specific buyer, and it's worth naming precisely, because none of the CRMs above are aimed at them. One customer record shared by the people answering support, writing the docs, and sending the outreach — not four records kept in sync by a nightly job. A permissive licence with no copyleft obligation and no ee/ directory, so the thing you self-host is the same code we run in Cloud. And a tool catalogue instead of a screen, because the operator you are optimising for is software rather than a person. Munin serves 204 MCP tools at one endpoint plus a library of markdown skills an agent reads at runtime, which is why a single pass can enrich a contact, triage the thread it came from, and draft the knowledge article behind it — one job across one schema rather than three integrations and a sync. If that is the shape of your problem, it is the shape Munin was built to fit.

Open-source CRMs compared

Licences and packaging change. Check the repository before you commit — including for us.

Frequently asked questions

What is the most permissively licensed open-source CRM? Munin, under MIT. Twenty, EspoCRM, and SuiteCRM are all AGPL-3.0, a copyleft licence that can require you to publish modifications if you offer the software as a service. MIT carries no such obligation — you can fork, modify, self-host, and even resell without publishing your changes.

Is AGPL a problem for my company? Usually not. For internal use — your team running the CRM for your own business — AGPL imposes no practical obligation. It becomes a question if you modify the code and offer it to third parties as a hosted service. Many legal teams still prefer to avoid it, which is why AGPL vendors sell commercial licences.

Which open-source CRM works with AI agents? Twenty and Munin both do, by different routes. Twenty ships an MCP server on every plan, including self-hosted Pro, alongside REST and GraphQL. Munin exposes 204 MCP tools at a single endpoint spanning all six modules, so any Model Context Protocol client can operate the whole platform — Claude, Cursor, ChatGPT, or a runner you wrote yourself. EspoCRM and SuiteCRM have REST APIs an agent can be driven against with custom work. The question worth asking is no longer whether a CRM has an endpoint — most now do — but how much of the customer sits behind it.

Is there a completely free CRM I can self-host? Yes — all five options here can be self-hosted at no licence cost. You pay in hosting, upgrades, and maintenance instead. Munin self-hosts with docker compose up; Twenty and Odoo are Docker-based; EspoCRM runs on ordinary LAMP hosting.

Do I need to self-host to avoid lock-in? No. Lock-in is about data portability, not hosting. What matters is whether you can get everything out cleanly and whether the code is available if the vendor changes. Munin Cloud runs the same MIT code as the repo, with symmetric export on every module.

How much does an open-source CRM cost in practice? The licence is free; the operating cost isn't. An Open Source Alternatives analysis put Twenty self-hosted at $4,500–$10,800 over three years, mostly infrastructure and engineering time, against $86,000–$132,000 for Salesforce Enterprise over the same period. Both figures are indicative rather than quotes — your own hourly rate moves them more than anything else does.

Which open-source CRM should I move to from HubSpot? If you only need the pipeline, Twenty. If you want the breadth HubSpot gave you — CRM, support, knowledge, content, outreach, analytics — on one record, Munin covers the same ground under MIT. The full HubSpot alternatives ranking is here, including the ones that aren't open source, and the migration itself has its own runbook.

If your customer record needs to be one record — shared by the people answering support, writing the docs, and sending the outreach — and you'd rather software did the paperwork around it, Munin is free forever self-hosted under MIT, with a free EU-hosted cloud tier if you'd rather not run Postgres yourself.

Read the licence. It's the only part of this comparison nobody can market at you.