head to head · open source
Cal.com vs Rythe-Engine
Cal.com has 49,651 GitHub stars, 15,521 forks, 1,432 open issues and last shipped yesterday. Rythe-Engine has 535 stars, 30 forks, 10 open issues and last shipped 1 months ago. Cal.com leads on adoption by 9,181% (49,651 vs 535 stars). Cal.com is written in TypeScript under MIT; Rythe-Engine is written in C++ under MIT. Cal.com has attracted 31% as many forks as stars, Rythe-Engine 6%. Cal.com 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 | Rythe-Engine | |
|---|---|---|
| GitHub stars | ★ 50K | ★ 535 |
| License | MIT | MIT |
| Written in | TypeScript | C++ |
| Last push | 2026-11-02 | 2026-10-01 |
| Forks | ⑂ 16K | ⑂ 30 |
| 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 Rythe-Engine if
- You want the Rythe-Engine feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches C++
- You evaluated both and Rythe-Engine 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 Rythe-Engine
Rythe Engine Rythe Engine is a data oriented C++20 game engine built to make optimal use of modern hardware. Rythe's core is built on an async compute minded design to take care of the logic and an ECS to take care of the data. This allows the engine, its other modules, and the editor to utilize all the power they can find and to be extremely modular. The engine's modules are separated into optional git submodules; links to them can be found in their respective folders in rythe/engine/. Features Rendering Post processing stack Particle system PBR Imgui Automatic exposure Modular rendering pipeline Custom shader…
read the full Rythe-Engine overview →
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Frequently asked questions
Is Cal.com or Rythe-Engine more popular?
Cal.com has 49,651 GitHub stars and Rythe-Engine has 535. Cal.com has the larger community by that measure.
Are Cal.com and Rythe-Engine free?
Both are open source. Cal.com is licensed under MIT and Rythe-Engine under MIT. Neither carries a licence fee.
What is the difference between Cal.com and Rythe-Engine?
Cal.com is written in TypeScript and Rythe-Engine in C++. 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 Rythe-Engine?
Choose Cal.com if you want the larger community (49,651 stars) or its MIT licence terms. Choose Rythe-Engine if its feature set, stack or MIT licence fits better. Both are self-hostable.