Fossify Calendar is an Android calendar app for planning events, reminders, birthdays, holidays, and other dates. It is made for people who want a simple calendar without ads or tracking.
The app keeps calendar information on the phone and can work with calendar accounts already set up on the device. It does not have its own Fossify account or cloud service.
You can create events with a name, date, time, reminder, location, and repeat setting. The app also supports widgets, custom colors, different calendar views, and recurring events.

How It Ran During Testing
For a strict hands-on review, I would normally test Fossify Calendar on a Redmi phone for two days. I do not have verified Redmi test readings for this review, so I will not make up battery percentages, phone temperatures, or crash numbers.
A proper test should include opening the calendar many times, moving between months, creating events, changing reminders, scrolling through busy dates, and checking the widgets. It should also test the app after the phone has been restarted.
The available app information shows that Fossify Calendar is built for local calendar use and has no internet permission. This means normal calendar work is not based on a constant internet connection.
The app can still show calendars that are synced by Android or another calendar provider already configured on the phone. The developer says Fossify itself does not run a calendar sync service.
Top Features
- Create Events: You can add events with dates, times, reminders, and repeat rules. This is useful for birthdays, meetings, appointments, and daily plans.
- Calendar Views: The app provides different ways to view your dates and events. You can switch between views to find upcoming plans more easily.
- Reminders: Events can have reminders so you do not forget important plans. Notifications and alarms are used to alert you at the chosen time.
- Widgets: Calendar widgets can be placed on the Android home screen. They let you see upcoming events without opening the full app.
- Custom Settings: You can change colors, themes, sounds, vibration, and other calendar settings. This lets you make the calendar easier to read and use.
Storage & Privacy Details
A recent Fossify Calendar build listed by F-Droid is about 7.4 MB as an APK. The final storage used on a phone can be higher because Android adds app data and cache.
The exact installed size depends on the Android version, app version, calendar data, settings, and other files created during use. Users can check the real number from Android Settings under Apps and Storage.
The app can work with local calendar data without internet access. Calendar information can also be handled by accounts and calendar providers already configured on the device.
The app may request calendar read and write access because it needs to see and change events. Contact access can be used for birthdays, anniversaries, or event participants, while notification, alarm, vibration, and startup access can support reminders.
The developer states that Fossify Calendar does not request internet access, does not track users, and does not send app data or usage information to Fossify.
Alternative Apps
Google Calendar is a better choice for people who already use Google’s calendar services and want strong online syncing. Samsung Calendar is useful for Samsung users who want a calendar closely connected with other Samsung phone tools.
Fossify Calendar takes a more local approach and does not provide its own cloud service. It is also ad-free and open-source, which may appeal to users who want a simple calendar with fewer outside services.
Strengths and Weaknesses
Pros
- No advertisements.
- No internet permission.
- Open-source project.
- Useful event reminders.
- Custom calendar views and widgets.
- Works with calendar providers on the phone.
Cons
- No Fossify cloud sync service.
- Some features need several Android permissions.
- Exact storage use varies by phone.
- Contact permission is needed for some contact-based features.
- Advanced online calendar users may need another service.
Who Should Get This App?
Best Fit
- People who want a simple calendar for everyday plans.
- Users who prefer local apps without ads or tracking.
Worst Fit
- People who want a complete cloud calendar service from the same developer.
- Users who need built-in CalDAV syncing without another Android service.
Common User Questions
Can Fossify Calendar work without internet?
Yes, the app does not request Android’s internet permission. Local calendar events and reminders can work without a constant internet connection.
Can I add repeating events?
Yes, the calendar supports repeating events and different repeat rules. This can be useful for birthdays, weekly plans, and regular appointments.
Does Fossify Calendar collect my calendar data?
The developer says it does not send calendar data, usage records, or identifiers to Fossify. Calendar data can still be handled by other accounts or calendar providers that you choose to use.
Offzack Verdict
Fossify Calendar is a useful choice for Android users who want a clean calendar for events, reminders, holidays, and recurring plans. Its local design, no-ad approach, widgets, and privacy settings make it a good fit for simple daily planning.
Users who need a full online calendar service may prefer Google Calendar or another cloud-based option. The exact performance and storage use can vary between Android phones.
Download Fossify Calendar – App from Google Playstore
Final Scorecard
- Ease of Use: ★★★★☆ — The basic calendar and event tools are easy to understand.
- Performance: ★★★★☆ — The app has a small package, but no verified Redmi test measurements were available.
- Features: ★★★★☆ — Events, reminders, repeat rules, widgets, holidays, and custom settings cover many daily needs.
- Privacy & Safety: ★★★★★ — The developer states that there is no internet permission, tracking, or data sent to Fossify.
- Value for Money: ★★★★★ — The ad-free and open-source calendar provides useful planning tools without requiring a Fossify account.
- Overall Rating: ★★★★☆ — Fossify Calendar is a strong choice for users who want a simple and privacy-focused Android calendar.