Open-source alternatives to Calendly
Looking to replace Calendly with something free and open-source? These 1 tools are the best open alternatives in 2026 — most are self-hostable, so you keep full control of your data and pay no subscription.
At a glance: how they compare
Click a column to sort — the best one depends on what matters to you.
| Alternative | Stars | Language | License | Last commit | In one line |
|---|---|---|---|---|---|
| Cal.com | — | — | AGPL-3.0 | — | Open scheduling infrastructure, a self-hostable Calendly. |
Which one should you pick?
Cal.com
Open scheduling infrastructure, a self-hostable Calendly. Its AGPL-3.0 license keeps the project and its forks open-source forever, and commercial use is allowed. Because it is self-hostable, your data can stay entirely on your own infrastructure.
Switching from Calendly without the drama
- Export your data from Calendly first — most tools above can import standard formats.
- Run your top pick in parallel for a week or two before committing; self-hosted options can be tried locally in minutes.
- Migrate one team or one project at a time, keeping the old account read-only until everything checks out.
FAQ
What is the best open-source alternative to Calendly?
The top open-source alternative is Cal.com — Open scheduling infrastructure, a self-hostable Calendly. The full ranked list is above.
Are these Calendly alternatives free?
Yes. Every tool listed is open-source and free to use; most can be self-hosted so you keep full control of your data.
Can I self-host an alternative to Calendly?
Most of these tools are designed to run on your own server or machine, giving you privacy and no subscription fees.
More open-source alternatives
Browse open-source replacements for dozens of popular tools — design, productivity, dev, analytics and more.
See all alternatives →