The Fossify Calendar Insider’s Guide
Everything we know about Fossify Calendar 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.
Fossify Calendar
The Insider’s Guide
Open-source Android calendar with no ads, tracking or account
Every plan, grade, refund rule and rival among calendar and scheduling apps, read from Fossify Calendar’s own pages.
Made by Fossify · 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 Fossify Calendar’s own pages, its app-store listings and our grades. Every fact in it is on Fossify Calendar’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
2.8
GPA, above 44 of the 74 other calendar and scheduling apps we grade
Fossify Calendar is a free, open-source calendar app for Android from the Fossify project, which publishes a set of everyday Android apps without ads or tracking. It keeps events, reminders and recurring schedules on the device, shows them in day, week, month, year and event-list views, and adds home screen widgets. The app does not request Android's Internet permission; calendars sync only through accounts or calendar providers already configured on the phone.
To get you started, here are 8 things to know about Fossify Calendar, taken from its own pages and our grades.
It's Android only, and help comes through a public issue tracker.
- 1
Best for a private Android calendar with no ads
That's also the limit: it has no sync or cloud of its own, no tasks and no typed natural-language entry.
- 2
It is free
Fossify Calendar has no paid plan at all. Free and open source under the GPL-3.0 license, with no ads, tracking or account. The project takes donations through GitHub Sponsors, Patreon, PayPal, Liberapay and Open Collective.
- 3
It runs on Android
Android.
- 4
Five calendar views
Day, week, month, year and event-list views, with event filters to narrow what is shown and controls for color, theme and display.
- 5
Recurring events and reminders
Events take times, durations, reminders and advanced repetition rules. Reminder sounds, looping audio and vibration can be customized.
- 6
Sync through device accounts
Calendar data can sync through accounts or calendar providers set up on the device, such as Google Calendar, Outlook, Nextcloud or Exchange. Fossify runs no sync service of its own.
- 7
A 2.8 GPA, above 44 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
Fossify Calendar is free, so making your own would save you nothing.
Fossify Calendar at a glance
- Pricing
- Free
- Free plan
- Yes
- Free trial
- None stated
- Runs on
- Android
- Made by
- Fossify
- Category
- Calendar & Scheduling
- Our grade
- 2.8 GPA, good
The report card
Best for a private Android calendar with no ads
Fossify Calendar is a free, open-source Android calendar with no ads, no tracking and no account, and it doesn't ask for internet access, so events stay on the phone unless an account you've set up syncs them. That's also the limit: it has no sync or cloud of its own, no tasks and no typed natural-language entry. It's Android only, and help comes through a public issue tracker.
| Subject | Grade | Comment |
|---|---|---|
| Value for money | A | Nothing to pay, ever. The complete app is free on Google Play and F-Droid with no in-app purchases, where the middle of this category asks $6 a month. The project lives on optional donations. |
| Free plan and trial | A | Free and open source under GPL-3.0, with no ads, no tracking, no account and no paid tier holding anything back. There's no limit here for a normal person to run into. |
| Features | C | The basics and no more: day, week, month, year and event-list views, repeat rules, reminders with custom sounds, file import and export, birthdays from your contacts. The gaps are owned up to on its own pages. No sync service of its own, no tasks, no plain-language entry. |
| Ease of use | B | No rating on record, as it isn't on iPhone, but there's nothing to set up: install it and it works, with no sign-up at all. Syncing does assume the Google, Outlook, Nextcloud or Exchange account is already on the phone. |
| Platforms and integrations | D | One operating system. The Fossify project lists Android as its only platform, and the app reads whatever accounts are already on the phone rather than syncing itself. |
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 Fossify Calendar is for
- Fits if you're on Android and want a calendar with no ads, no tracking and no sign-up
- Works for a private calendar that stays on the phone, installed from Google Play or F-Droid
Who it is not for
- Skip it if you also use an iPhone or a computer, because it's Android only
- Not for you if you want a cloud account that follows you between devices, as it has none of its own
- Too light for people who want tasks, booking links or typed natural-language entry
- Watch out: help is a public issue tracker and community channels, and the project runs on donations
- Watch out: Google Play and F-Droid release on their own schedules, so versions can differ between stores
Good to know
Good for
- Android users who want a calendar without ads, tracking or sign-up
- People who prefer open-source apps installed from F-Droid
- Keeping a private, local calendar that never leaves the phone
Worth knowing
- Android only; the Fossify project lists Android as its sole platform.
- The app has no sync service or cloud account of its own. Syncing depends on accounts or calendar providers configured on the device.
- Development is funded by donations, and help comes through a public issue tracker and community channels.
- Google Play and F-Droid publish releases on their own schedules, so versions can differ between stores.
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
Fossify Calendar is free to use.
The project lives on optional donations.
Fossify Calendar
$0
The complete app, installed from Google Play or F-Droid, with no ads or in-app purchases. Donations are optional.
The free plan
Free and open source under the GPL-3.0 license, with no ads, tracking or account. The project takes donations through GitHub Sponsors, Patreon, PayPal, Liberapay and Open Collective.
Read from play.google.com on Oct 9, 2026.
Part 03 · Features
What it does
Its main features, where it runs, what it works with and who makes it
1
Place it runs: Android
Open-source Android calendar with no ads, tracking or account. Here is what it does, as its own site describes it, and what it covers: open source, works offline, local-first, calendar.
The gaps are owned up to on its own pages.
- Five calendar views
- Day, week, month, year and event-list views, with event filters to narrow what is shown and controls for color, theme and display.
- Recurring events and reminders
- Events take times, durations, reminders and advanced repetition rules. Reminder sounds, looping audio and vibration can be customized.
- Sync through device accounts
- Calendar data can sync through accounts or calendar providers set up on the device, such as Google Calendar, Outlook, Nextcloud or Exchange. Fossify runs no sync service of its own.
- Import and export
- Calendars can be imported from and exported to files, which keeps the data portable and gives a way to back it up or move it to another app.
- Holidays, birthdays and anniversaries
- Holidays can be imported, and birthdays and anniversaries can be drawn from the phone's contacts if contacts access is granted.
- No Internet permission
- The app does not request Android's Internet permission, contains no advertising and sends no app data or usage records to Fossify.
Where it runs
- Android
What it works with
- Google Calendar
- Outlook
- Nextcloud
- Exchange
Fossify Calendar is made by Fossify.
Part 04 · Standing
Where it stands
Its grades against its category, and whether to keep it or make your own
44/74
Other calendar and scheduling apps it is graded above
Fossify Calendar's GPA of 2.8 is higher than 44 of the 74 other calendar and scheduling apps we grade, and level with 12.
It stands best on free plan and trial (A, above 56 of 74) and worst on platforms and integrations (D, above 0).
Fossify Calendar has no paid plan.
On features, ease of use and platforms it scores 2.0 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. Fossify Calendar’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
- DPlatforms and integrationsAbove 0 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. Fossify Calendar 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
Fossify Calendar is free, so making your own would save you nothing.
What you could make
- Calendar: an app builder makes this well.
What you could not
- A real app for Android. Something home-made would be a web page.
- Hooks into the device itself: widgets.
What this rests on. Fossify Calendar’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
Etar, Proton Calendar, Tuta Calendar, Google Calendar and aCalendar
The 5 tools Fossify Calendar is most often weighed against, with where each one differs from it.
- 2.6GPA
Etar
Free
- 2.6GPA
Proton Calendar
Free plan · from $3.99/mo
End-to-end encrypted calendar from the maker of Proton Mail.
- Only Proton Calendar lists a web app.
- Only Proton Calendar lists macOS, Windows, Linux and iOS apps.
- Proton Calendar is end-to-end encrypted, according to its own site.
- 2.4GPA
Tuta Calendar
Free plan · from €3/mo
End-to-end encrypted calendar bundled with Tuta Mail.
- Only Tuta Calendar lists a web app.
- Only Tuta Calendar lists macOS, Windows, Linux and iOS apps.
- Tuta Calendar is end-to-end encrypted, according to its own site.
- 3.4GPA
Google Calendar
Free plan · from $7/mo
Online calendar from Google, free with a personal account.
- Only Google Calendar lists a web app.
- Only Google Calendar lists an iOS app.
- Fossify Calendar is open source, according to its own site.
- 2.6GPA
aCalendar
Free plan · from $2.49 one-time
Android calendar with widgets, tasks and one-time upgrades.
- Fossify Calendar is open source, according to its own site.
- aCalendar can be bought with a one-time purchase.
- aCalendar also covers tasks.
Part 06 · Questions
Quick answers
The questions people ask about it, each answered in a line or two
13
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 Fossify Calendar free?
Yes. Fossify Calendar is free to use.
How much does Fossify Calendar cost?
Fossify Calendar lists one plan. Fossify Calendar: $0.
What platforms does Fossify Calendar work on?
Fossify Calendar is available on Android.
Does Fossify Calendar have an iPhone app?
No iPhone app was listed when its pages were read on Oct 9, 2026. Fossify Calendar is listed for Android.
Does Fossify Calendar have a Windows app?
No Windows app was listed when its pages were read on Oct 9, 2026. Fossify Calendar is listed for Android.
Is Fossify Calendar open source?
Yes. Fossify Calendar is open source, according to its own site.
Does Fossify Calendar work offline?
Yes, according to its own site. What works without a connection differs by plan and platform, so check the vendor's page for the detail.
What does Fossify Calendar integrate with?
Fossify Calendar's listing names Google Calendar, Outlook, Nextcloud and Exchange.
Who makes Fossify Calendar?
Fossify Calendar is made by Fossify.
What are the alternatives to Fossify Calendar?
The closest alternatives to Fossify Calendar in our directory are Etar, Proton Calendar, Tuta Calendar, Google Calendar and aCalendar.
How does Fossify Calendar compare with other calendar and scheduling apps?
Fossify Calendar's GPA of 2.8 is higher than 44 of the 74 other calendar and scheduling apps we grade, and level with 12.
Is Fossify Calendar good value for money?
ToolGPA grades Fossify Calendar A for value for money. Fossify Calendar has no paid plan.
Could I make my own version of Fossify Calendar?
Fossify Calendar is free, so making your own would save you nothing. What you could not make: A real app for Android.
Where this guide comes from
The prices, plans, platforms and features were read from Fossify Calendar’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 Fossify's own pages on 9 October 2026. Also tested with a demo account on 2026-09-09.
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 Fossify. Prices change, so check fossify.org before you buy.
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
- Fossify Calendar, kept up to dateEverything in this guide, with prices and grades as they are todaytoolgpa.com/tools/fossify-calendar
- 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, "Fossify Calendar: The Insider's Guide", checked Oct 9, 2026. https://toolgpa.com/tools/fossify-calendar
Know someone choosing between calendar and scheduling apps?
Send them this guide: toolgpa.com/tools/fossify-calendar/guide
ToolGPA elsewhere: youtube.com/@toolgpa
See our other guides
The best-graded calendar and scheduling apps after Fossify Calendar, 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 Fossify Calendar’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. Fossify Calendar is a trademark of its owner, and this guide is not made, paid for or approved by Fossify. Prices and plans change: check fossify.org before you buy.