# Crab Fit

> Free, open-source availability heat map for group events

Crab Fit is a free tool by Ben Grant for finding a time that suits a group. Someone creates an event with possible dates and a time range and sends the link around; each person marks when they are free, and the results update live as a heat map of the group's availability. No account is needed. The code is open source under the GNU GPLv3 and can be self-hosted, and the project is supported by donations.

- **Category:** Calendar & Scheduling
- **Made by:** Ben Grant
- **Website:** https://crab.fit/
- **Runs on:** Web, Android, Browser extension
- **Facts last checked:** Oct 9, 2026

## Pricing

Crab Fit is free to use.

- **Pricing model:** Free
- **Free plan:** Free with no account. The privacy policy says the service is provided at no cost, and the site asks for donations so that it can stay free for everyone.
- **Free trial:** None listed.

| Plan | Price | What you get |
| --- | --- | --- |
| Crab Fit | $0 | The complete web tool, the Android app and the Firefox and Safari extensions. Donations are optional. |

Read from https://crab.fit/ on Oct 9, 2026. Prices change, so confirm with Crab Fit before buying.

## Key features

- **Events created in one form:** Name the event or leave the name blank to have one generated, pick specific dates or days of the week, drag out a time range and choose a time zone. There is no sign-up step.
- **Live availability heat map:** Responses appear live on a heat map where darker cells mean more people are free. Hovering or tapping a slot shows who is available, and names can be clicked to view people individually.
- **Google and Outlook calendar import:** When entering availability you can sync with Google Calendar or Outlook Calendar, or reuse a recent event. Importing overwrites the availability you had already entered.
- **Time zone handling:** Each event stores the time zone it was created in, and a respondent can switch to their detected local time zone. Hours outside the event are greyed out.
- **Name and optional password per event:** Respondents enter a name for each event and can add a password to stop others changing their availability. The site says passwords are hashed.
- **Open source and self-hosting:** The code is published under the GNU GPLv3, and the repository links to a guide for running your own instance.

## Good for

- Friends, clubs and coworkers picking a time for a one-off event
- Groups whose members should not have to create accounts
- People who want to run their own scheduling poll server

## Worth knowing

- Events are deleted after 3 months of inactivity, so it does not keep a long-term record.
- The mobile app is for Android only; no iPhone app is listed.
- Extensions are offered for Firefox and for Safari on Mac. The project's code notes that the Chrome extension was removed.
- It needs a connection: the app's own message says a Crab Fit does not work offline.

## Works with

Google Calendar, Outlook Calendar

**Tags:** Surveys, Open source, Self-hostable

## Alternatives

- [When2meet](https://toolgpa.com/tools/when2meet): Free group availability survey for finding a time to meet. [Compare](https://toolgpa.com/compare/crab-fit-vs-when2meet)
- [LettuceMeet](https://toolgpa.com/tools/lettucemeet): Free availability poll for finding a time a group can meet. [Compare](https://toolgpa.com/compare/crab-fit-vs-lettucemeet)
- [Rallly](https://toolgpa.com/tools/rallly): Open-source meeting polls for finding a time that suits a group. [Compare](https://toolgpa.com/compare/crab-fit-vs-rallly)
- [Timeful](https://toolgpa.com/tools/timeful): Free, open-source group availability poll with calendar autofill. [Compare](https://toolgpa.com/compare/crab-fit-vs-timeful)
- [WhenIsGood](https://toolgpa.com/tools/whenisgood): Free availability grid for finding when a group can meet. [Compare](https://toolgpa.com/compare/crab-fit-vs-whenisgood)

## Sources

The prices, plans, platforms and features above were read from these pages on Oct 9, 2026:

- https://crab.fit/
- https://crab.fit/how-to
- https://crab.fit/privacy
- https://raw.githubusercontent.com/GRA0007/crab.fit/main/README.md
- https://raw.githubusercontent.com/GRA0007/crab.fit/main/frontend/src/i18n/locales/en/event.json
- https://raw.githubusercontent.com/GRA0007/crab.fit/main/frontend/src/components/DownloadButtons/DownloadButtons.tsx
- https://addons.mozilla.org/en-US/firefox/addon/crab-fit/
- https://apps.apple.com/us/app/crab-fit/id1570803259

Page: https://toolgpa.com/tools/crab-fit
Listed by ToolGPA (toolgpa.com).