head to head · open source
sellbird vs Atomic CRM
sellbird has 4,775 GitHub stars, 1,013 forks, 30 open issues and last shipped yesterday. Atomic CRM has 1,437 stars, 916 forks, 19 open issues and last shipped yesterday. sellbird leads on adoption by 232% (4,775 vs 1,437 stars). sellbird is written in Python under AGPL-3.0; Atomic CRM is written in TypeScript under MIT. sellbird has attracted 21% as many forks as stars, Atomic CRM 64%. sellbird was the more recently maintained of the two, and both are self-hostable with no licence fee.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
← all 20902 open source comparisons
Side by side
| sellbird | Atomic CRM | |
|---|---|---|
| GitHub stars | ★ 4.8K | ★ 1.4K |
| License | AGPL-3.0 | MIT |
| Written in | Python | TypeScript |
| Last push | 2026-11-07 | 2026-11-07 |
| Forks | ⑂ 1.0K | ⑂ 916 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick sellbird if
- You weight community size — 4.8K stars and counting
- You want the AGPL-3.0 license terms
- Your stack matches Python
- You value the larger contributor base for long-term maintenance
pick Atomic CRM if
- You want the Atomic CRM feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches TypeScript
- You evaluated both and Atomic CRM fits your workflow better
About sellbird
The open source outreach platform that runs on your Claude or ChatGPT plan. Sellbird finds companies that need what you sell, finds the person who decides, checks their email address, writes each one a personal cold email, sends it and handles the replies. It runs on your own machine, and by default nothing goes out until you approve it. Harvey is now Sellbird. Same project, same history, new name. Already running Harvey? Your setup carries over: see Upgrading from Harvey. Prefer not to run it yourself? sellbird.ai is the hosted version, with sending domains, inboxes and warmup set up for you. It's in early…
read the full sellbird overview →
About Atomic CRM
Atomic CRM A full featured CRM built with React, shadcn admin kit, and Supabase. Atomic CRM is free and open source. You can test it online at . Features 📇 Organize Contacts : Keep all your contacts in one easily accessible place. ⏰ Create Tasks & Set Reminders : Never miss a follow up or deadline. 📝 Take Notes : Capture important details and insights effortlessly. ✉️ Capture Emails : CC Atomic CRM to automatically save communications as notes. 📊 Manage Deals : Visualize and track your sales pipeline in a Kanban board. 🔄 Import & Export Data : Easily transfer contacts in and out of the system. 🔐 Control…
read the full Atomic CRM overview →
More in Business Software
Related comparisons
More CRM & Sales projects
Compare either of these against the rest of the CRM & Sales field.
Frequently asked questions
Is sellbird or Atomic CRM more popular?
sellbird has 4,775 GitHub stars and Atomic CRM has 1,437. sellbird has the larger community by that measure.
Are sellbird and Atomic CRM free?
Both are open source. sellbird is licensed under AGPL-3.0 and Atomic CRM under MIT. Neither carries a licence fee.
What is the difference between sellbird and Atomic CRM?
sellbird is written in Python and Atomic CRM in TypeScript. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, sellbird or Atomic CRM?
Choose sellbird if you want the larger community (4,775 stars) or its AGPL-3.0 licence terms. Choose Atomic CRM if its feature set, stack or MIT licence fits better. Both are self-hostable.