Open-source SaaS alternatives (self-hosting)
calcom/cal.diy
Self-hostable open-source scheduling, a Calendly alternative
- 48k
- MIT
- TypeScript
What it is and why it matters
From the Cal.com team, this open-source scheduling infrastructure is a Calendly alternative you can host yourself. It offers a booking page on your own domain, with no per-seat cost, handling time zones, buffers and round-robin across a team. Being open source, you can bend the booking flow to whatever your business needs.
Key points
- Booking page on your own domain, with no per-seat cost
- Handles time zones, buffers and round-robin across a team
- Open source: the booking flow is customizable with no paywalls
Where we saw it
The Next New Thing 2026-05-29 The hosts value that the Cal.com team open-sourced the code: you can use it free if you host it yourself and also edit it, instead of being locked into Calendly's fixed structure. One of them, speaking as someone who has booked meetings with this tool, says it works well and recommends it as a starting point for a new founder. They contrast how simple the software is with what Calendly charges. Free Notion and Gamma Alternatives: Top GitHub Repos This Week Cloud Codes 2026-07-03 In this rundown of open-source alternatives, they present Cal.com as the free version of Calendly: the same booking page on your own domain, with no per-seat tax and no upsell wall. They note it integrates with your calendars, handles time zones and buffers, round-robins a team and embeds anywhere, with the video's general caveat that self-hosting means maintenance. 10 Github Repos That Will Kill Your Monthly Subscriptions
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