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Calendly does 6 jobs: personal booking pages, calendar sync and availability, group polls to find a time, team round-robin and collective scheduling, payments for bookings, reminders. Most projects replace one or two of them, so pick the job you actually need.
Open-source alternatives to Calendly that run locally, allow commercial use and need no paid API include Calnode (personal booking pages, calendar sync and availability, team round-robin and collective scheduling, payments for bookings and reminders; Apache-2.0; runs on CPU), Punctual (personal booking pages, calendar sync and availability, team round-robin and collective scheduling and reminders; MIT), Croodle (group polls to find a time; MIT; runs on CPU) and Django-Appointment (personal booking pages and reminders; Apache-2.0). None of the 15 projects we track covers all 6 Calendly jobs, so most people combine two or more.
Django web app for date, time and general polls, with optional registration, private polls and LDAP login. Self-host via Docker.
MIT-licensed community edition of Cal.com for self-hosted booking pages, with team, workflow and other enterprise features removed.
Calendly-style booking app as a single Go binary with SQLite; team round-robin, Stripe payments, webhooks, REST API and a built-in MCP server.
Single-user Calendly-style booking page that deploys to your own Cloudflare account, with Google and Outlook calendar sync and email reminders.
When2meet-style group availability tool; people paint their free times on a grid and see the overlap. Hosted at crab.fit or self-hosted.
End-to-end encrypted Doodle-style poll to pick a date or vote on any topic; PHP with plain-file storage, no database.
Reusable Django app that adds appointment booking pages, staff availability, conflict handling and email reminders to your own Django site.
Self-hosted PHP booking app where customers book services with providers, with Google Calendar and CalDAV sync and email notifications.
Small self-hosted Doodle alternative for meeting-time and other polls; Django app run with pip or Docker Compose. In maintenance mode.
Nextcloud app that publishes booking pages for slots in your Nextcloud calendar, with email confirm/cancel links, reminders and Talk rooms.
Calendly-style booking pages, team round-robin, calendar sync and reminders that deploy to your own Cloudflare Workers account. MIT, pre-1.0.
Doodle-style group scheduling polls; propose times, share a link and let people vote without an account. Self-host with Docker or use rallly.co.
Thunderbird's booking-page app; share your availability, connect CalDAV or Google calendars, and let others book a time. Self-host with Docker.
When2meet-style availability poll that overlays Google, Outlook and Apple calendars to find a time for a group; hosted or self-hosted with Docker.
Self-hosted booking pages with Google, Outlook and CalDAV sync, reminders, webhooks and optional Stripe payments, in one Docker container.
No project meets all of your requirements. The list below shows what you'd need to relax.
We hid them because something is missing, unknown or conflicting. Here's what.
Yes. Calnode, Tymeslot, Punctual, Cal.diy and Nextcloud Appointments are free to download and run on your own computer without paid API keys. Each covers only part of what Calendly does, so check which job you need.
Yes, with Tymeslot (AGPL-3.0), Nextcloud Appointments (AGPL-3.0) and Punctual (MIT). Check the hardware notes and licence conditions on each page before you start.
Yes, with Tymeslot (AGPL-3.0), Punctual (MIT) and Calnode (Apache-2.0). Check the hardware notes and licence conditions on each page before you start.
Confirmed: Calnode, CloudMeet, Croodle, Django-Appointment and Punctual. With conditions: Bitpoll, Cal.diy, Crab Fit, Easy!Appointments, jawanndenn, Nextcloud Appointments, Rallly, Thunderbird Appointment, Timeful (formerly Schej) and Tymeslot. This is not legal advice; read each licence.
Not as of 2026-10-16. Personal booking pages, calendar sync and availability, group polls to find a time, team round-robin and collective scheduling, payments for bookings and reminders are covered by different projects.