head to head · open source
Cal.com vs shoutrrr
Cal.com has 49,774 GitHub stars, 15,565 forks, 1,432 open issues and last shipped 5 days ago. shoutrrr has 502 stars, 71 forks, 13 open issues and last shipped yesterday. Cal.com leads on adoption by 9,815% (49,774 vs 502 stars). Cal.com is written in TypeScript under MIT; shoutrrr is written in PHP under Apache-2.0. Cal.com has attracted 31% as many forks as stars, shoutrrr 14%. shoutrrr 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.
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Side by side
| Cal.com | shoutrrr | |
|---|---|---|
| GitHub stars | ★ 50K | ★ 502 |
| License | MIT | Apache-2.0 |
| Written in | TypeScript | PHP |
| Last push | 2026-11-03 | 2026-11-07 |
| Forks | ⑂ 16K | ⑂ 71 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Cal.com if
- You weight community size — 50K stars and counting
- You want the MIT license terms
- Your stack matches TypeScript
- You value the larger contributor base for long-term maintenance
pick shoutrrr if
- You want the shoutrrr feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches PHP
- You evaluated both and shoutrrr fits your workflow better
About Cal.com
[!WARNING] Use at your own risk. Cal.diy is the open source community edition of Cal.com and it is intended for users who want to self host their own Cal.diy instance. It is strictly recommended for personal, non production use. Please review all installation and configuration steps carefully. Self hosting requires advanced knowledge of server administration, database management, and securing sensitive data. Proceed only if you are comfortable with these responsibilities. [!TIP] For any commercial and enterprise ready scheduling infrastructure, use Cal.com, not Cal.diy; hosted by us or get invited to on prem…
read the full Cal.com overview →
About shoutrrr
Shoutrrr An open source, self hostable alternative to Buffer, Typefully & Hootsuite. Write once, publish everywhere. Schedule posts to X, Bluesky, LinkedIn, Facebook, Instagram, Threads, and Discord from one calendar — on your own server, with your own data. What is Shoutrrr? Shoutrrr is a social media scheduling tool you run yourself. Connect your accounts, draft a post once, and send it to every network at the same time — or queue it to go out on a recurring schedule. No monthly seat fees, no third party holding your tokens or your data. It's built for individuals and teams: invite collaborators into a shared…
read the full shoutrrr overview →
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Frequently asked questions
Is Cal.com or shoutrrr more popular?
Cal.com has 49,774 GitHub stars and shoutrrr has 502. Cal.com has the larger community by that measure.
Are Cal.com and shoutrrr free?
Both are open source. Cal.com is licensed under MIT and shoutrrr under Apache-2.0. Neither carries a licence fee.
What is the difference between Cal.com and shoutrrr?
Cal.com is written in TypeScript and shoutrrr in PHP. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, Cal.com or shoutrrr?
Choose Cal.com if you want the larger community (49,774 stars) or its MIT licence terms. Choose shoutrrr if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.