Crab Fit at a glance
Checked 16 Oct 2026Crab Fit (535 stars, last commit Apr 2026, no tagged releases) has participants mark the times they are free and shows when most people overlap, with optional Google Calendar import. GPL-3.0. Self-hosting means deploying a Next.js frontend, a Rust API and a database you choose from several adaptors; the guide suggests Vercel and Fly.io and there is no one-command install. It only finds a group time: no booking pages, reminders, round-robin or payments.
RepoQuarry. “Crab Fit.” Checked 16 Oct 2026. https://repoquarry.dev/projects/crab-fitHow much of Calendly does it replace?
1 of 6 jobs. Replaces group availability polls only; no booking links, reminders or payments.
For personal booking pages, calendar sync and availability, team round-robin and collective scheduling, payments for bookings, reminders, see other Calendly alternatives. You may also need to build an interface, an API server and hosting yourself.
How much of Doodle Professional does it replace?
1 of 3 jobs. Shared availability helps a group find overlapping times; Doodle booking pages, calendar sync and professional administration are not covered.
For appointment booking pages, calendar availability sync, see other Doodle Professional alternatives. You may also need to build an interface, an API server and hosting yourself.
Facts, with sources
Every answer links to where we found it. We read the documentation; we did not install it.
Crab Fit is fully open-source, and you can get your own version running by following the self-hosting guide.github.com · crab.fit#self-hosting ↗ today
Open-source and licensed under the GNU GPLv3.github.com · crab.fit#readme ↗ today
Ensure you consult the license file for all restrictions if you decide to use or modify the code.github.com · Self%E2%80%90hosting ↗ today
This feature will be disabled if these variables are not present.github.com · Self%E2%80%90hosting ↗ today
The API is written using rust, and so compiles down to an executable you can run from any operating system.github.com · Self%E2%80%90hosting ↗ today
Before you begin, you'll need to choose where you want to host the frontend, API and database.github.com · Self%E2%80%90hosting ↗ today