Best Free Calendar Apps for Android in 2026
Quick Verdict
Google Calendar is the best free calendar for most Android users — free, no ads, no in-app purchases, and already on most phones. But "best" depends on the job: Proton Calendar is the privacy pick with real encryption, TimeTree is the family pick for shared schedules, Business Calendar 2 wins on widgets, and Any.do merges your tasks with your calendar. This guide compares all of them with live Play Store facts, so you can see exactly what each free tier costs you — in ads, limits, or subscriptions.
The 10 Best Free Calendar Apps at a Glance
| App | Play rating | Ads on free tier | In-app purchases | Best for |
|---|---|---|---|---|
| Google Calendar | 4.6 | No | No | Most users |
| Proton Calendar | 4.3 | No | No | Privacy |
| TimeTree | 4.7 | Yes | Yes | Family sharing |
| Business Calendar 2 | 4.5 | Yes | Yes | Widgets |
| Any.do | 4.4 | No | Yes | Tasks + calendar |
| Outlook Calendar | 4.5* | — | — | Microsoft 365 users |
| Samsung Calendar | — | No* | No* | Galaxy owners |
| Notion Calendar | — | No* | No* | Notion users |
| aCalendar | — | Yes* | Yes* | Customization |
| Cozi | — | — | — | Family extras |
Starred figures come from competitor sources and were not re-verified by us on October 4. Dashes mean the source did not state the badge clearly.
1. Google Calendar — Best for Most Users
Google Calendar is the default answer for a reason. It is fast, free, and deeply connected to Gmail — flight confirmations, hotel reservations, and appointments appear as events automatically. Sharing is simple, recurring events and reminders work without friction, and it syncs instantly across Android, iPhone, and the web. The Material You widget shows your next events at a glance. The honest caveat: your privacy depends on Google's data practices, and the view customization is more limited than power calendars offer. If you use a Samsung Galaxy phone, note that Google Calendar may not come pre-installed — switching from Samsung's app is an easy upgrade. Our live Play check: Google LLC, 4.6 stars from 4.84M reviews, 10B+ installs, no ads and no in-app purchases, updated October 1, 2026.
2. Proton Calendar — Best for Privacy
Proton Calendar is the only major calendar with end-to-end encryption for every event — title, description, location, and attendees. Even Proton's own servers cannot read your schedule. The free plan covers full calendar functionality with a small number of calendars, which is enough for one person. The trade-offs: it cannot connect external Google or Outlook calendars directly, collaboration features are thinner, and the widget is basic. If your schedule holds medical appointments, client meetings, or anything sensitive, this is the strongest Android option. Our live Play check: Proton AG, 4.3 stars from 8.46K reviews, 1M+ installs, no ads and no in-app purchases shown, updated September 29, 2026. If privacy tools interest you generally, our Signal vs Telegram privacy comparison shows how we evaluate them.
3. TimeTree — Best for Family Sharing
TimeTree is built around one idea: a shared calendar for families, couples, roommates, and small teams. You create a calendar, invite people with a link, and everyone can add events and comment on them — no permissions to configure, no admin setup. Event-based comments keep the "who's picking up the kids?" discussion attached to the right event instead of buried in a group chat. The honest catches: the free tier shows ads (Premium removes them, around $4.49/month), and you cannot export events to other calendars. Our live Play check: TimeTree, Inc., 4.7 stars from 239K reviews, 10M+ installs, Contains ads and In-app purchases badges, updated September 30, 2026.
4. Business Calendar 2 — Best Widgets
If your home screen is where you check your schedule, Business Calendar 2 is the power pick. Its widgets come in multiple sizes with configurable information density — see your whole week without opening the app. The app itself offers agenda, day, week, and month views with drag-and-drop event editing, templates, and task integration. Two honest warnings: the free version shows ads, and after a recent update some users report audio ads — the Pro upgrade removes them. Also note pricing confusion online: an older review quotes a $7 Pro upgrade, but in 2026 the in-app Pro upgrade is $21.99, and there is a separate $8.99 "Business Calendar Pro" listing. Our live Play check: Appgenix Software, 4.5 stars from 274K reviews, 10M+ installs, Contains ads and In-app purchases badges, updated September 23, 2026.
5. Any.do — Best for Tasks + Calendar Together
Any.do solves a different problem: juggling events and to-dos across two apps. Its daily planner shows your calendar events next to your task list, with recurring tasks, location-based reminders, and voice input. The free plan covers the basics; sharing checklists and some integrations need Premium. It is the only app on this list carrying an Editors' Choice badge on Play, which says something about its polish. Our live Play check: Any.do To-do list & Calendar, 4.4 stars from 506K reviews, 10M+ installs, no ads label, In-app purchases badge, Editors' Choice, updated September 10, 2026.
6. Outlook Calendar — Best for Microsoft Users
If your workplace runs on Microsoft 365 or Exchange, Outlook Calendar is the natural pick. Email, calendar, contacts, and Teams meetings live in one app, with support for multiple accounts so work and personal schedules sit side by side. It handles complex scheduling — recurring meetings with exceptions, room booking, delegate access — better than simpler calendars. The free Outlook app covers personal use; full Microsoft 365 features need a subscription. Figure: 4.5 stars reported by competitors; not re-verified by us on October 4.
7. Samsung Calendar — Best for Galaxy Owners
Every Galaxy phone ships with Samsung Calendar, and it is worth trying before installing anything else. It is optimized for One UI, loads fast, syncs with Google, Outlook, and Samsung accounts, supports S Pen input on Note and Ultra devices, and pairs with the Galaxy Watch. The limits: it only exists on Samsung devices — no web version, no cross-platform support. Ads/IAP: none reported by sources; not re-verified by us on October 4.
8. Notion Calendar — Best for Notion Users
If Notion is your main workspace, Notion Calendar pulls it all together: it shows Google Calendar and other events alongside your Notion pages, lets you time-block tasks from a database with a tap, and includes scheduling links. It is completely free with no paid tier. The catch is obvious — it needs a Notion account and has little standalone value without one. If you live in Notion, our Notion vs Obsidian comparison may interest you too. Not Play-verified by us on October 4.
9. aCalendar — Best for Customization
aCalendar is the classic Android power calendar: adjustable font sizes, color schemes, event density, flexible views from agenda to year, and strong widgets. It works offline with locally cached events. The price of power is setup time — there are more settings than most people need — and the free version carries ads, removable with a one-time $11.99 purchase (no subscription). Android-only, with no web companion. Figures from competitor sources; not re-verified by us on October 4.
10. Cozi — Best Family Extras
Where TimeTree keeps family scheduling simple, Cozi adds the rest of household life: shared grocery lists, chores, and meal plans in one app. If your family wants one app for everything — not just appointments — Cozi is the pick over TimeTree. Both have free tiers with paid upgrades; check the current listing before committing, since family-app pricing changes often. Not Play-verified by us on October 4.
Widgets Compared
Android's widget system is one of its biggest advantages, and calendar widgets are the reason many people switch apps. Business Calendar 2 offers the densest, most configurable widgets — multiple sizes, adjustable density, week/day/agenda options. aCalendar is close behind with strong layout and color customization. Google Calendar's widget is clean and reliable with Material You theming. Samsung Calendar's month-plus-agenda combo feels native on Galaxy phones. Proton Calendar and Notion Calendar have only basic event lists. If the widget is how you read your day, the choice is really between Business Calendar 2 and aCalendar.
Privacy and Offline Notes
Two things worth knowing before you commit. First, privacy: Google Calendar and Outlook feed the ecosystems of advertising and enterprise companies — your events are subject to their data policies. Proton Calendar encrypts everything end to end and does not use your data for advertising. Second, offline: most calendars keep a local copy, so you can view and add events with no signal and sync later. Test it with airplane mode before you rely on it for a trip.
Live Play Store Facts
| App | Developer | Package | Rating | Reviews | Downloads | Price | Ads / IAP | Updated |
|---|---|---|---|---|---|---|---|---|
| Google Calendar | Google LLC | com.google.android.calendar | 4.6 | 4.84M | 10B+ | Free | No ads, no IAP | Oct 1, 2026 |
| Proton Calendar: Secure Events | Proton AG | me.proton.android.calendar | 4.3 | 8.46K | 1M+ | Free | No ads, no IAP | Sep 29, 2026 |
| TimeTree - Shared Calendar | TimeTree, Inc. | works.jubilee.timetree | 4.7 | 239K | 10M+ | Free | Ads + IAP | Sep 30, 2026 |
| Business Calendar 2 Planner | Appgenix Software | com.appgenix.bizcal | 4.5 | 274K | 10M+ | Free | Ads + IAP | Sep 23, 2026 |
| Any.do - To do list & Calendar | Any.do To-do list & Calendar | com.anydo | 4.4 | 506K | 10M+ | Free | No ads, IAP yes | Sep 10, 2026 |
All five listings were checked live on October 4, 2026, and every package name resolved to the correct official app. Any.do also carries an Editors' Choice badge.
Frequently Asked Questions
What is the best free calendar app for Android?
Google Calendar is the best free calendar for most Android users: free, no ads, no in-app purchases, 10B+ installs, and automatic event detection from Gmail. Samsung owners get a strong pre-installed alternative in Samsung Calendar.
Is there a calendar app with no ads on Android?
Yes. Google Calendar, Proton Calendar, and Notion Calendar have no ads. TimeTree and Business Calendar 2 show ads on their free tiers, which their paid versions remove.
Which calendar app is best for families sharing a schedule?
TimeTree is built for this: shared calendars, per-event comments, and simple invite links. Cozi is the other family pick, adding grocery lists, chores, and meal plans beyond the calendar.
Which Android calendar app has the best widgets?
Business Calendar 2 has the most configurable widgets, with multiple sizes and information density options. aCalendar's widgets are also strong. Google Calendar's Material You widget is clean and reliable for most users.
Can I use a calendar app without a Google account?
Yes. Proton Calendar works with a Proton account and encrypts everything, while Outlook, Samsung Calendar, and TimeTree all support their own or third-party accounts. You can run a full calendar on Android without ever signing into Google.
Do calendar apps work offline?
Most do. Google Calendar, Outlook, Proton Calendar, and Samsung Calendar keep a local copy so you can view and add events with no signal, then sync when you reconnect.
The Final Recommendation
Start with Google Calendar — for most people it is all the calendar they will ever need, free and without ads. Switch to Proton Calendar if privacy is the priority, TimeTree if the family shares one schedule, Business Calendar 2 if your home screen widget is sacred, or Any.do if your to-dos keep getting lost. Before paying for any upgrade, live with the free version for a week: the right calendar is the one you actually open every day.
Download Links
- Download Google Calendar on Google Play — by Google LLC, free, no ads, no in-app purchases.
- Download Proton Calendar on Google Play — by Proton AG, free, no ads, encrypted.
- Download TimeTree on Google Play — by TimeTree, Inc., free with ads.
- Download Business Calendar 2 on Google Play — by Appgenix Software, free with ads, Pro upgrade available.
- Download Any.do on Google Play — by Any.do, free, Editors' Choice.