The best Twenty CRM alternative depends on how much of the CRM you want to build yourself. Established open source CRMs give you a finished system to host, suites and hosted options take the server work away, and developer toolkits let you assemble your own. Whichever you pick, decide who'll host, back up and update it before you move a single contact.
Do you like the idea behind Twenty, a CRM you shape yourself, but want something with a longer track record, more built in, or nobody's server to look after? You're in good company. Twenty describes itself as an open source CRM that's modular, scalable and built to fit your business, which is a great pitch if you've got the time and the skills to assemble it.
Open source CRM has moved on a lot, and there's more than one way to keep the freedom without the full build. The eight options below are in no particular order. I've grouped them by type first, because a finished CRM, a business suite and a developer toolkit solve very different problems, even when their home pages use the same words.
Four kinds of CRM to look at instead of Twenty
Established self-hosted CRMs. EspoCRM and SuiteCRM are the ones to look at if you want a finished open source CRM you can install and run, covering sales, marketing and service out of the box. The second also offers managed hosting if you'd rather not run the server yourself.
Suites and hosted all-rounders. Odoo CRM sits inside a much bigger family of business apps, so it makes sense if you'd like your CRM to talk to the rest of your operations. Vtiger is mainly a hosted all-in-one CRM, but it also publishes a free open source edition that runs on your own servers. Frappe CRM is a lighter open source sales CRM with email and WhatsApp built in.
Developer toolkits and low-code. Atomic CRM is a toolkit from Marmelab rather than a finished product: you build it around your business, much as Twenty encourages you to. Corteza goes further again, a low-code platform you can shape into a CRM and other business apps.
A modern hosted option. Attio isn't open source at all. It's here for teams who liked Twenty's modern, build-it-your-way feel more than its licence, and who'd happily hand the hosting to someone else.
What running your own CRM involves
Here's the part the download button doesn't tell you. An open source CRM is free to download, but it isn't free to run. Someone has to host it, back it up, apply security patches and handle the upgrade every time a new version lands. That someone also carries the duty to keep customer data secure under UK and EU data protection law. What that duty means in practice varies, so check your regulator's guidance for your country.
Teams that choose a self-hosted CRM to avoid licences often find the bill turns up as hours of upkeep instead. The other surprise is how much each project ships out of the box. Some of the options above are complete CRMs you configure. Others are toolkits you assemble, which is closer to running a software project than buying a product.
None of that makes open source a bad choice. It makes it a choice about people as much as software. If there's a developer on your team who enjoys this work, the freedom is worth a lot. If there isn't, a managed hosting option or a hosted CRM might save you a painful year.
The eight options side by side
| Tool | Type | Good for |
|---|---|---|
| Atomic CRM | Open source developer toolkit | Developers assembling a CRM around their own processes |
| Attio | Hosted, AI-native CRM | Revenue teams who'd rather not run any servers |
| Corteza | Open source low-code platform | Shaping CRM and other business apps with low-code |
| EspoCRM | Self-hosted open source, all-round | Contacts, sales, support and marketing in one system |
| Frappe CRM | Open source sales CRM | Sales teams working leads over email and WhatsApp |
| Odoo CRM | Suite with a built-in CRM | Firms wanting CRM linked to other business apps |
| SuiteCRM | Established open source, self-host or managed | Sales, marketing and service, self-hosted or managed |
| Vtiger | Open source edition plus hosted suite | A hosted CRM with an on-premise edition available |
Who each CRM is built for
Listed A to Z.
Atomic CRM
Best for: Developer teams who want an open source starter kit to build on, including an MCP server for connecting AI assistants to their CRM data.
Attio
Best for: Revenue teams that don't want to host anything and like a CRM that connects to their inbox and calendar and shapes itself around the business (vendor claim).
Corteza
Best for: Organisations wanting a low-code, open source base that the project positions as a Salesforce alternative, for CRM and other apps shaped to their processes.
EspoCRM
Best for: Small teams after a ready-made open source CRM covering contacts, sales, support and marketing, with workflow automation and an open API for other systems.
Frappe CRM
Best for: Sales teams juggling leads and deals across email and WhatsApp who want every colleague on it, per the vendor's claim of unlimited users.
Want AI doing the heavy lifting in your marketing?
I build the systems that handle the boring 80 percent, so you get your week back. Done properly, with the human kept in.
Odoo CRM
Best for: Businesses that want opportunities, follow-ups and customer messages tracked in a CRM that plugs into the rest of the Odoo suite of business apps.
SuiteCRM
Best for: Teams wanting a long-running open source CRM for sales, marketing and service, on their own servers or managed hosting, without vendor lock-in (vendor claim).
Vtiger
Best for: Marketing, sales and support teams wanting one hosted CRM with AI features, plus a separate free open source edition if on-premise ever matters.
My advice on choosing an open source CRM
Start with an honest answer to one question: who on your team will look after this system in a year's time? If the answer is a named developer with time set aside, the toolkits and the low-code platform deserve a serious look, because they'll bend to your processes in a way a packaged CRM won't.
If the answer is nobody, pick a finished CRM and look hard at managed hosting, or go hosted and stop worrying about servers altogether. There's no shame in that. A CRM nobody updates is a CRM nobody trusts, and your sales team will drift back to spreadsheets within months.
If you're still early and don't need much yet, my guide to the best CRM for startups covers lighter hosted options, and my list of folk CRM alternatives helps teams who mainly want a simple relationship tracker.
Three questions to put to any open source project
- Who maintains it, and is there a company or community behind it that'll still be around in a few years?
- How often does it release updates, and how painful are upgrades between major versions?
- Is there a managed hosting option if you change your mind about running it yourself?
Ask every project on your shortlist the same three, and write the answers down. The one that gives clear, slightly boring answers is usually the one you'll still be happy with later.
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Frequently asked questions
Is an open source CRM free to use?
The software is free to download, but someone has to host, secure, back up and update it. That work takes time, so count the hours of upkeep, not only the missing licence.
What's the difference between a CRM and a CRM toolkit?
A CRM ships with contacts, deals and pipelines ready to use. A toolkit gives developers the building blocks to assemble a CRM around their own processes, which means more control and more work.
Can I move my data from one open source CRM to another?
Most CRMs import contacts, companies and deals from spreadsheet files, so export your records and test an import with a small batch first. Custom fields and automations usually have to be rebuilt by hand.
Do I need a developer to self-host a CRM?
For a live system holding customer data, it helps a lot. You'll need someone comfortable with servers, backups and updates, or a managed hosting option that handles them for you.
Who's responsible for data security on a self-hosted CRM?
You are. When you host the CRM yourself, keeping customer data secure is your job. The rules vary by country, so check your data protection regulator's guidance.
