replacing Calendly
Scheduling and meeting booking — Calendly pricing: Free / $10-15/seat/month. Below: 2 free, self-hostable open source projects that cover the same ground, ranked by real GitHub adoption.
There are 2 open source Calendly alternatives tracked on this registry, against Calendly pricing of Free / $10-15/seat/month. The most-adopted is Cal.com with 48,529 GitHub stars under MIT, written in TypeScript. Together the set has 53,790 stars across 1 language and 2 licences. All 2 are free to self-host with no licence fee, and 2 of 2 received a commit in the last 90 days. 2 head-to-head Calendly comparisons are available.
Cal.diy is a fully open-source, community-maintained fork of Cal.com, stripped of all enterprise and commercial features. It provides a self-hosted scheduling platform built on the T3 stack (Next.js, tRPC, Prisma, Tailwind CSS, Zod), licensed under MIT with no proprietary code or license keys required.
MIT · TypeScript · Calendly vs Cal.com →
Rallly is an open-source scheduling and collaboration tool built to help groups find the best date and time to meet. Instead of exchanging messages about availability, a person creates a poll with several candidate dates and times, shares the link, and participants vote on the options that work for them. It lives in the Business Software category, specifically Scheduling and Event Management, and positions itself as an open alternative to Calendly. The project is written in TypeScript and released under the AGPL-3.0 license, with the source hosted publicly and the hosted service available at rallly.co.
AGPL-3.0 · TypeScript · Calendly vs Rallly →
Self-host your own scheduling page, no vendor required
Effortless group scheduling for seamless collaboration
last updated nightly · ranking method: github stars, live-tracked
Cal.com is the most-starred open source alternative to Calendly in this registry, with 48,529 GitHub stars. 2 alternatives are compared here in total.
Yes. Every project listed on this page is open source and free to self-host — there is no licence fee. Some projects also sell a managed hosted version, but the self-hosted path costs nothing.
Compare licence terms, community size (stars), primary language and release activity. A fast-moving project with a compatible licence and an active maintainer base matters more than raw star count when you are committing to a migration.