aCalendar vs Fossify Calendar
We give aCalendar a 3.2 GPA and Fossify Calendar a 3.0, out of 4.0. aCalendar grades higher on features. They get the same grade on value for money, the free plan, ease of use and platforms.
Price, platforms and features side by side. The table says where each price was read and when.
aCalendar
Android calendar with widgets, tasks and one-time upgrades
Free plan · from $2.49 one-time
Fossify Calendar
Open-source Android calendar with no ads, tracking or account
Free
How we grade them
| 3.2GPAaCalendarVery good | 3.0GPAFossify CalendarVery good | |
|---|---|---|
| Value for money | AUpgrades are one-time payments from $2.49 to $11.99, and aCalendar+ bundles every one of them with no ads for $11.99 once. That's about two months of a typical calendar subscription, paid a single time. | AIt costs nothing. The complete app is free on Google Play and F-Droid with no in-app purchases, and the project lives on optional donations. |
| Free plan and trial | AFree gets day, week, month, agenda and year views, 8 widgets, printing and ICS or CSV export. It shows ads, at most one a day according to the maker. Tasks, public holidays and extra colours cost extra, but the calendar itself is all there. | AFree and open source under GPL-3.0, with no ads, no tracking, no account and no paid tier holding anything back. You get all of it from day one. |
| Features | AFive views, eight widgets, multi-select, and printing to PDF or PNG. Upgrades add tasks with subtasks from Google Tasks or Microsoft To Do, plus attendees, free or busy status and separate work and personal profiles. | BDay, week, month, year and event-list views, repeat rules, reminders with custom sounds, file import and export, and birthdays pulled from your contacts. Solid basics. But there's no sync service of its own, so that depends on what's on your phone. |
| Ease of use | BThere's no App Store rating to go on, since it isn't on iPhone. It picks up the calendars Android already syncs, so there's no new account to make. Swipe up and down through time, sideways to switch views. | BThere's no App Store rating to go on, as it isn't on iPhone. Install it and it works, with no sign-up. If you want syncing, the Google, Outlook, Nextcloud or Exchange account has to be set up on the device already. |
| Platforms and integrations | DAndroid only. The maker states there's no iOS, web or PC version and that none is planned. It does read Google Calendar, Exchange and CalDAV accounts through Android's own sync. | DAndroid only. The Fossify project lists Android as its sole platform. It syncs through accounts already on the phone, such as Google Calendar, Outlook, Nextcloud or Exchange. |
| Best for | a full Android calendar with no subscription | a private Android calendar with no ads |
The GPA is the average of the five grades: an A is 4 points, an F is none. The full reasons are on each tool's page: aCalendar and Fossify Calendar. How we grade
Where they differ
- aCalendar starts at $2.49 to $11.99 per one-time in-app upgrade; aCalendar+ is $11.99. Fossify Calendar is free.
- aCalendar can be bought with a one-time purchase.
- Fossify Calendar is open source, according to its own site.
- aCalendar also covers tasks.
In commonFree planAndroidCalendar
At a glance
| aCalendar | Fossify Calendar | |
|---|---|---|
| Pricing | Free plan | Free |
| Starts at | $2.49 to $11.99 per one-time in-app upgrade; aCalendar+ is $11.99 | Free |
| Free plan | Free version with ads: day, week, month, agenda and year views, 8 widgets, multi-select, printing and ICS or CSV export. Tasks, business features, public holidays and extra colors are paid upgrades. | 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. |
| Free trial | None listed | None listed |
| Android | ||
| Made by | Tapir Apps GmbH | Fossify |
| Price read from | play.google.com | play.google.com |
| Checked | Oct 9, 2026 | Oct 9, 2026 |
Who each one suits
aCalendar
- Android users who want a full calendar without a subscription
- People who want Google Tasks or Microsoft To Do lists inside their calendar
- Anyone who prefers to buy only the upgrades they need
Fossify Calendar
- 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
aCalendar
- Android only. The vendor states there is no iOS, web or PC version and that none is planned.
- The free version shows ads, and tasks, attendees, profiles, public holidays and the wider color choices all need a paid upgrade.
- In-app upgrades cannot be shared through Google Play Family Library; only the separate aCalendar+ app can.
- Licenses are tied to the store account and cannot be moved between Google Play and Huawei AppGallery.
Fossify Calendar
- 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.
Key features
aCalendar
- Day, week, month, agenda and year views
- Swipe vertically to move through time and horizontally to switch views. Day and week views can show a mini month or a graphical week overview alongside.
- Eight home screen widgets
- Widgets include agenda, date, day and week layouts and a birthday widget added in version 2.9. Accent colors can be set per widget with the Colors upgrade.
- Tasks next to events
- The Tasks upgrade shows to-dos on their due dates in day, week and month views, with subtasks and a tasks widget. It works with Google Tasks, Microsoft To Do, CalDAV through Tasks.org, and local lists.
- Business features
- An upgrade adds attendee management, linking contacts to events, free or busy status, private events, and profiles that separate work and personal calendars.
- Print and export
- Calendar views can be printed or exported as PDF or PNG, and events exported as ICS or CSV files. Multi-select applies an action to several events at once.
- Uses Android's calendar sync
- The app runs no servers of its own. It reads and writes the calendars Android syncs, including Google Calendar, Microsoft Exchange accounts and CalDAV servers, plus local calendars.
Fossify Calendar
- 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.
Plans
aCalendar
aCalendar$0
All calendar views, 8 widgets, flexible recurrences, birthdays, moon phases, printing and export. Shows ads, at most one a day according to the vendor.
In-app upgrades$2.49 - $11.99
one-time payment per item on Google Play
Ad-free, Tasks, Business Features, Colors and Holidays bought individually inside the free app. Not shareable through Family Library.
aCalendar+$11.99
one-time purchase on Google Play
A separate paid app with every upgrade included and no ads. It can be shared through Google Play Family Library.
Fossify Calendar
Fossify Calendar$0
The complete app, installed from Google Play or F-Droid, with no ads or in-app purchases. Donations are optional.
Ways to pay less
aCalendar
- Other savings
Family Library sharing for aCalendar+
Bought as a paid app after July 2, 2016, aCalendar+ can be shared with up to 5 family members through Google Play Family Library. In-app upgrades are not eligible.
Fossify Calendar
No public discounts listed.
