head to head · open source
OpenOutreach vs mailcheap
OpenOutreach has 3,478 GitHub stars, 626 forks, 1 open issues and last shipped 11 days ago. mailcheap has 1,597 stars, 403 forks, 8 open issues and last shipped yesterday. OpenOutreach leads on adoption by 118% (3,478 vs 1,597 stars). OpenOutreach is written in Python under GPL-3.0; mailcheap is written in JavaScript under AGPL-3.0. OpenOutreach has attracted 18% as many forks as stars, mailcheap 25%. mailcheap was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (ai-agents), so they are genuine substitutes rather than adjacent tools.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| OpenOutreach | mailcheap | |
|---|---|---|
| GitHub stars | ★ 3.5K | ★ 1.6K |
| License | GPL-3.0 | AGPL-3.0 |
| Written in | Python | JavaScript |
| Last push | 2026-10-23 | 2026-11-02 |
| Forks | ⑂ 626 | ⑂ 403 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick OpenOutreach if
- You weight community size — 3.5K stars and counting
- You want the GPL-3.0 license terms
- Your stack matches Python
- You value the larger contributor base for long-term maintenance
pick mailcheap if
- You want the mailcheap feature set and don't need the biggest community
- You prefer the AGPL-3.0 license terms
- Your stack matches JavaScript
- You evaluated both and mailcheap fits your workflow better
About OpenOutreach
OpenOutreach — open source AI agent for B2B lead generation Describe your product. Define your target market. The AI finds the people who fit, tells you why each one does, and emails them. Self hosted CLI. One install, one onboarding, one command. Demo 🚀 What is OpenOutreach? OpenOutreach is a self hosted, open source lead finder that qualifies for you — and then writes the email. You describe your product and your target market; it discovers matching people from a licensed data provider , judges each one against the ICP it learned from your description, hands you the ones that fit with the reason each was…
read the full OpenOutreach overview →
About mailcheap
MailCheap MailCheap is a newsletter app: write an issue, send it to your list, publish it on the web. Self host it free with your own Amazon SES or PostShiba account, or let us run it on MailCheap Cloud. [!IMPORTANT] No support. Issues are off, and setup questions go unanswered. Fork it, deploy it, make it yours. Or let us run it: mailcheap.ai. Self host it free, or let us run it This repository is the whole app: the dashboard, the public archive, the REST API, the MCP server and the docs. MailCheap Cloud runs this same code with MAILCHEAP CLOUD=true , which adds plans and Stripe billing, and our own sending…
read the full mailcheap overview →
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Frequently asked questions
Is OpenOutreach or mailcheap more popular?
OpenOutreach has 3,478 GitHub stars and mailcheap has 1,597. OpenOutreach has the larger community by that measure.
Are OpenOutreach and mailcheap free?
Both are open source. OpenOutreach is licensed under GPL-3.0 and mailcheap under AGPL-3.0. Neither carries a licence fee.
What is the difference between OpenOutreach and mailcheap?
OpenOutreach is written in Python and mailcheap in JavaScript. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, OpenOutreach or mailcheap?
Choose OpenOutreach if you want the larger community (3,478 stars) or its GPL-3.0 licence terms. Choose mailcheap if its feature set, stack or AGPL-3.0 licence fits better. Both are self-hostable.