The Crab Fit Insider’s Guide
Everything we know about Crab Fit in one document: what it costs, its grades, getting a refund, getting help and what else to look at. Read it here, or keep a copy.
Crab Fit
The Insider’s Guide
Free, open-source availability heat map for group events
Every plan, grade, refund rule and rival among calendar and scheduling apps, read from Crab Fit’s own pages.
Made by Ben Grant · checked Oct 9, 2026 · toolgpa.com
Contents
- 01WelcomeWhat it is, who it suits, its grades and the ten things to know first
- 02What it costsEvery plan, the free plan, ways to pay less and how prices have moved
- 03What it doesIts main features, where it runs, what it works with and who makes it
- 04Where it standsIts grades against its category, and whether to keep it or make your own
- 05The alternativesThe tools it is most often weighed against, side by side
- 06Quick answersThe questions people ask about it, each answered in a line or two
- 07About ToolGPAWho made this guide, what else is on the site, and how to cite it
ToolGPA put this guide together from Crab Fit’s own pages, its app-store listings and our grades. Every fact in it is on Crab Fit’s page too, where it is kept up to date. Checked Oct 9, 2026.
Part 01 · Overview
Welcome
What it is, who it suits, its grades and the ten things to know first
3.2
GPA, above 66 of the 74 other calendar and scheduling apps we grade
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.
To get you started, here are 8 things to know about Crab Fit, taken from its own pages and our grades.
No rating on record, but there's nothing to set up: one form makes an event, and you can leave the name blank and let it invent one.
- 1
Best for finding a time a whole group is free
Crab Fit finds a time a group is free: you pick some dates, send a link, everyone marks when they're free, and a heat map shows the overlap.
- 2
It is free
Crab Fit has no paid plan at all. 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.
- 3
It runs on 2 platforms
Web and Android, with a browser extension too.
- 4
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.
- 5
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.
- 6
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.
- 7
A 3.2 GPA, above 66 of 74
That is against the other calendar and scheduling apps we grade, on value, the free plan, features, ease of use and platforms.
- 8
Keep it
Crab Fit is free, so making your own would save you nothing.
Crab Fit at a glance
- Pricing
- Free
- Free plan
- Yes
- Free trial
- None stated
- Runs on
- Web, Android, Browser extension
- Made by
- Ben Grant
- Category
- Calendar & Scheduling
- Our grade
- 3.2 GPA, very good
The report card
Best for finding a time a whole group is free
Crab Fit finds a time a group is free: you pick some dates, send a link, everyone marks when they're free, and a heat map shows the overlap. It's free, with no account for anyone. It does only that: it won't send an invite or book the slot, events are deleted after 3 months of inactivity, there's no iPhone app, and the Chrome extension was removed.
| Subject | Grade | Comment |
|---|---|---|
| Value for money | A | It costs nothing, and there's no paid tier above it. One plan at $0 covers the web tool, the Android app and the browser extensions, with the project running on optional donations. |
| Free plan and trial | A | Free with no account, for you and for everyone you send the link to. The privacy policy says the service is provided at no cost, and no cap is listed. Events are deleted after 3 months of inactivity. |
| Features | C | Finding a time is the whole of it: a live heat map, time zones per person, Google and Outlook import, an optional password. That's a smaller job than a calendar does. It won't send the invite, book the slot or keep a record past 3 months idle. |
| Ease of use | B | No rating on record, but there's nothing to set up: one form makes an event, and you can leave the name blank and let it invent one. Nobody you send it to signs up for anything. |
| Platforms and integrations | B | Web, an Android app, and extensions for Firefox and for Safari on Mac, with availability pulled in from Google Calendar or Outlook. No iPhone app is listed, and it won't work offline. |
An A is worth 4 points, a B 3, a C 2, a D 1 and an F nothing. The GPA is the average of the five.
Who Crab Fit is for
- Fits if you're picking a time for a one-off thing with friends, a club or coworkers
- Works for groups where nobody wants to create another account
Who it is not for
- Skip it if you need a record that lasts, because events are deleted after 3 months of inactivity
- Not for you if you want it to send invites or book the slot, as it only shows when people are free
- Skip it if your group wants a phone app on iPhone: the mobile app is Android only
- Watch out: the Chrome extension was removed, leaving Firefox and Safari on Mac, and it won't work offline
- Watch out: importing from Google or Outlook overwrites the availability you'd already entered
Good to know
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.
Part 02 · Pricing
What it costs
Every plan, the free plan, ways to pay less and how prices have moved
Free
No paid plan at all
Crab Fit is free to use.
It costs nothing, and there's no paid tier above it.
Crab Fit
$0
The complete web tool, the Android app and the Firefox and Safari extensions. Donations are optional.
The 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.
Read from crab.fit on Oct 9, 2026.
Part 03 · Features
What it does
Its main features, where it runs, what it works with and who makes it
3
Places it runs: Web, Android and Browser extension
Free, open-source availability heat map for group events. Here is what it does, as its own site describes it, and what it covers: open source, self-hostable, surveys.
Finding a time is the whole of it: a live heat map, time zones per person, Google and Outlook import, an optional password.
- 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.
Where it runs
- Web
- Android
- Browser extension
What it works with
- Google Calendar
- Outlook Calendar
Who makes Crab Fit
Crab Fit is a group scheduling site created by Ben Grant and released as open source under the GNU GPLv3. No company stands behind it: the site is free to use and its footer asks for donations through Ko-fi to keep it that way.
- Ownership
- Community project. An open-source project with no company behind it. The site says it was created by Ben Grant and points to the repository, which is held under his own GitHub account and licensed under the GNU GPLv3.crab.fit
- Founders and leaders
- Ben Grant, Creatorcrab.fit
Read on Oct 18, 2026 from the company’s own pages and from news reports. What is not stated there is left out.
Part 04 · Standing
Where it stands
Its grades against its category, and whether to keep it or make your own
66/74
Other calendar and scheduling apps it is graded above
Crab Fit's GPA of 3.2 is higher than 66 of the 74 other calendar and scheduling apps we grade, and level with 5.
It stands best on free plan and trial (A, above 56 of 74) and worst on features (C, above 3).
Crab Fit has no paid plan.
On features, ease of use and platforms it scores 2.7 out of 4. Nothing scores higher for less, though at least one tool matches that score at a lower price.
Each grade against the category
Every bar is all 75 calendar and scheduling apps we grade, cut by the letter each got. Crab Fit’s own letter is outlined.
- AValue for moneyAbove 45 of 74
- AFree plan and trialAbove 56 of 74
- CFeaturesAbove 3 of 74
- BEase of useAbove 32 of 74
- BPlatforms and integrationsAbove 25 of 74
Price against what you get
Each dot is one of 67 calendar and scheduling apps. Further left costs less; higher up scores better on features, ease of use and platforms. Crab Fit is the marked dot.
What paid plans start at, a month (each step along is roughly double) →
Keep it, or make your own?
Whether this is something you could build for yourself with an AI app builder, and what you would give up.
Keep it
Crab Fit is free, so making your own would save you nothing.
It is one of the better ones too: its GPA of 3.2 is higher than 66 of the 74 other calendar and scheduling apps we grade.
What you could make
- Surveys: an app builder makes this well.
What you could not
- A real app for Android. Something home-made would be a web page.
What this rests on. Crab Fit’s listing: what it does, where it runs, what it plugs into and what it costs. It is a judgement about the kind of software this is. We have not built a replacement for it, and making your own means looking after it too. How we decide, and every tool’s verdict.
Part 05 · Alternatives
The alternatives
The tools it is most often weighed against, side by side
When2meet, LettuceMeet, Rallly, Timeful and WhenIsGood
The 5 tools Crab Fit is most often weighed against, with where each one differs from it.
- 2.8GPA
When2meet
Free
Free group availability survey for finding a time to meet.
- Only Crab Fit lists an Android app.
- Only Crab Fit lists a browser extension.
- Crab Fit is open source and self-hostable, according to its own site.
- 3.0GPA
LettuceMeet
Free
Free availability poll for finding a time a group can meet.
- Only Crab Fit lists an Android app.
- Only Crab Fit lists a browser extension.
- Crab Fit is open source and self-hostable, according to its own site.
- 2.6GPA
Rallly
Free plan · from $6/mo
Open-source meeting polls for finding a time that suits a group.
- Only Crab Fit lists an Android app.
- Only Crab Fit lists a browser extension.
- Crab Fit also covers surveys.
- 3.0GPA
Timeful
Free
Free, open-source group availability poll with calendar autofill.
- Only Crab Fit lists an Android app.
- Only Crab Fit lists a browser extension.
- Timeful also covers calendar.
- 3.0GPA
WhenIsGood
Free
Free availability grid for finding when a group can meet.
- Only Crab Fit lists an Android app.
- Only Crab Fit lists a browser extension.
- Crab Fit is open source and self-hostable, according to its own site.
Part 06 · Questions
Quick answers
The questions people ask about it, each answered in a line or two
12
Questions, each answered in a line or two
The short version of everything above, for when you only need the answer. Each one is told in full in its part of the guide.
Is Crab Fit free?
Yes. Crab Fit is free to use.
How much does Crab Fit cost?
Crab Fit lists one plan. Crab Fit: $0.
What platforms does Crab Fit work on?
Crab Fit is available on Web and Android. It also has a browser extension.
Does Crab Fit have an iPhone app?
No iPhone app was listed when its pages were read on Oct 9, 2026. Crab Fit is listed for Web and Android.
Does Crab Fit have a Windows app?
No Windows app was listed when its pages were read on Oct 9, 2026. Crab Fit is listed for Web and Android.
Is Crab Fit open source?
Yes. Crab Fit is open source, according to its own site.
What does Crab Fit integrate with?
Crab Fit's listing names Google Calendar and Outlook Calendar. A listing names up to eight integrations, so it may connect to more.
Who makes Crab Fit?
Crab Fit is made by a company of the same name. An open-source project with no company behind it.
What are the alternatives to Crab Fit?
The closest alternatives to Crab Fit in our directory are When2meet, LettuceMeet, Rallly, Timeful and WhenIsGood.
How does Crab Fit compare with other calendar and scheduling apps?
Crab Fit's GPA of 3.2 is higher than 66 of the 74 other calendar and scheduling apps we grade, and level with 5.
Is Crab Fit good value for money?
ToolGPA grades Crab Fit A for value for money. Crab Fit has no paid plan.
Could I make my own version of Crab Fit?
Crab Fit is free, so making your own would save you nothing. It is one of the better ones too: its GPA of 3.2 is higher than 66 of the 74 other calendar and scheduling apps we grade.
Where this guide comes from
The prices, plans, platforms and features were read from Crab Fit’s own pages on Oct 9, 2026, and the grades were given on Oct 10, 2026. Graded from this listing, whose facts were read from Crab Fit's own pages on 9 October 2026. Also tested with a demo account on 2026-09-04.
Every tool we list gets five grades, A to F, each with its reason, and a GPA that averages them. How each is decided is at toolgpa.com/grades. This guide is ToolGPA’s own work; it is not made, paid for or approved by Ben Grant. Prices change, so check crab.fit before you buy.
- crab.fit/
- crab.fit/how-to
- crab.fit/privacy
- raw.githubusercontent.com/GRA0007/crab.fit/main/README.md
- raw.githubusercontent.com/GRA0007/crab.fit/main/frontend/src/i18n/locales/en/event.json
- raw.githubusercontent.com/GRA0007/crab.fit/main/frontend/src/components/DownloadButtons/DownloadButtons.tsx
- addons.mozilla.org/en-US/firefox/addon/crab-fit/
- apps.apple.com/us/app/crab-fit/id1570803259
Part 07 · About
About ToolGPA
Who made this guide, what else is on the site, and how to cite it
3,189
Tools graded, in 94 categories
ToolGPA grades software the way a school report grades a pupil: five subjects, a letter for each with the reason written beside it, and a GPA that averages them. Prices, plans and platforms are read from each maker’s own pages and dated, so you always know how fresh a figure is.
Every grade, review and ranking on ToolGPA is our own judgement. No company can pay for a grade or change one. Every tool on the site has a guide like this one, free to download and pass on. It all lives at toolgpa.com.
3,189
tools graded
94
categories
426
price changes on record
579
apps priced in 12 countries
What else is on toolgpa.com
- Crab Fit, kept up to dateEverything in this guide, with prices and grades as they are todaytoolgpa.com/tools/crab-fit
- How grades are givenThe rules behind every letter and every GPAtoolgpa.com/grades
- Value chartsWhat each tool costs against what it scores, for every categorytoolgpa.com/charts
- CompareAny two tools side by side, plan by plantoolgpa.com/compare
- Price changesEvery price rise and cut on record, each with its sourcetoolgpa.com/price-changes
- Prices by countryWhat apps cost on the App Store in 12 countriestoolgpa.com/prices-by-country
- Pay lessEvery public discount: yearly billing, students, nonprofitstoolgpa.com/save
- Keep or makeWhich tools are worth paying for, and which you could build yourselftoolgpa.com/keep-or-make
Scan for the live page
Prices and grades as they are today
Quoting this guide?
Please name ToolGPA and link to the live page, so readers can check the figures for themselves:
ToolGPA, "Crab Fit: The Insider's Guide", checked Oct 9, 2026. https://toolgpa.com/tools/crab-fit
Know someone choosing between calendar and scheduling apps?
Send them this guide: toolgpa.com/tools/crab-fit/guide
ToolGPA elsewhere: youtube.com/@toolgpa
See our other guides
The best-graded calendar and scheduling apps after Crab Fit, each with an Insider's Guide of its own.
- Calendar & Scheduling Insider's GuideEvery one of the 75 calendar and scheduling apps we grade, compared
- Notion Calendar Insider's GuideFree calendar app that connects to Notion databases3.6 GPA
- Google Calendar Insider's GuideOnline calendar from Google, free with a personal account3.4 GPA
- World Time Buddy Insider's GuideVisual time zone converter and world clock for planning calls3.4 GPA
Choosing software? Every tool graded, every price dated.
Compare tools at toolgpa.com ›Everything in this guide is ToolGPA’s own summary of what Crab Fit’s pages, its app-store listings and public reviews said on the dates shown. Grades are our judgement under the rules at toolgpa.com/grades. Every grade, review and ranking on ToolGPA is our own judgement. No company can pay for a grade or change one. Crab Fit is a trademark of its owner, and this guide is not made, paid for or approved by Ben Grant. Prices and plans change: check crab.fit before you buy.