Cal.com vs ONLYOFFICE
Is it time to switch? We break down the differences so you can stop bleeding money.
Choose Cal.com.
If you want to own your data, save money, and avoid vendor lock-in, Cal.com is more popular among developers.
What Actually Matters
No fluff — just the differences that affect your decision
Both open source, different licenses: Cal.com uses MIT, ONLYOFFICE uses AGPL-3.0. Check the fine print if you're building commercial.
Both can run on your own metal with Docker. Full data ownership, no cloud dependency. We have deploy guides for each.
Cal.com dominates with 49.0k GitHub stars vs 7.0k. Bigger community = more plugins, more answers on Stack Overflow, faster bug fixes.
Cal.com is built in TypeScript, ONLYOFFICE in Shell. Matters if you want to contribute, extend, or debug internals.
Try both — most offer free tiers. The right pick depends on your stack size, team, and tolerance for DevOps.
Cal.com
The open-source Calendly alternative. Take control of your scheduling.
Why Choose Cal.com
- ✓Self-hosted scheduling — no data leaves your server
- ✓Deeply extensible with a plugin architecture and API
- ✓Round-robin, collective, and managed event types
Drawbacks
- ×Can be overkill for simple use cases
ONLYOFFICE
Powerful online document editors for text, spreadsheets, and presentations. Highly compatible with MS Office.
Why Choose ONLYOFFICE
- ✓Full-featured collaborative editing for docs, sheets, and slides
- ✓Drop-in MS Office compatibility with high-fidelity rendering
- ✓Self-hosted integration with Nextcloud, Seafile, and more
Drawbacks
- ×Self-hosting can be complex
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