Best Calendar Apps in 2026
Updated
In short: Mozilla Thunderbird is ranked #1 of 197 as of 5 October 2026, ahead of Microsoft Outlook Calendar and Lark. The best-ranked option with a free plan is Microsoft Outlook Calendar. The lowest first paid tier on this page is Microsoft Outlook Calendar at $1.67/mo.
Calendar apps can help you keep appointments organized, coordinate schedules and make time for planned work. Compared on calendar sync, free plans, mobile apps, paid starting prices, scheduling links, shared calendars, time blocking and video meeting support, these entries cover useful differences to consider for solo planning or collaboration. Mozilla Thunderbird, Microsoft Outlook Calendar and Lark are among the options shown. Think about whether you need schedules to stay in sync across calendars, share availability with others or reserve focused blocks of time. Scheduling links and meeting support may shape how you arrange appointments, while mobile access and plan terms help you compare where and at what cost you can use an app.
197 calendar apps ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
24 of the 25 here have a free tier you can use, 2 have open-source code on record, and 1 has full bars: free, open, on most of your devices and documented.
| # | App | Signal | Free tier | Open code | Devices | From | Score |
|---|---|---|---|---|---|---|---|
| 1 | Mozilla ThunderbirdWindows · Mac · Linux · Android | Full bars | 4 of 6 | Free | 9.0 | ||
| 2 | Microsoft Outlook CalendarWeb · Mac · Android · iPhone | Three bars | — | 4 of 6 | $1.67/mo | 8.2 | |
| 3 | LarkWeb · Windows · Mac · Linux · Android · iPhone · API | Three bars | — | 6 of 6 | Free | 8.2 | |
| 4 | EGroupwareWeb · Windows · Mac · Linux | Three bars | — | 4 of 6 | €21.90/mo | 8.2 | |
| 5 | Proton CalendarAndroid · iPhone | Two bars | — | 2 of 6 | Free | 8.0 | |
| 6 | TeamupWeb · Android · iPhone · API | Three bars | — | 3 of 6 | $12/mo | 8.0 | |
| 7 | CoziWeb · Android · iPhone | Three bars | — | 3 of 6 | $3.25/mo | 8.0 | |
| 8 | Calendar.comWeb · Android · iPhone · API · Extension | Three bars | — | 3 of 6 | $20/mo | 8.0 | |
| 9 | Notion CalendarAndroid · iPhone | Two bars | — | 2 of 6 | Free | 7.9 | |
| 10 | DoodleWeb | Two bars | — | 1 of 6 | $11/mo | 7.8 | |
| 11 | Tuta CalendarAndroid · iPhone | Two bars | — | 2 of 6 | €3/mo | 7.8 | |
| 12 | TimeTreeAndroid · iPhone | Two bars | — | 2 of 6 | $4.49/mo | 7.8 | |
| 13 | Reclaim AIWeb · Extension | Two bars | — | 1 of 6 | $10/mo | 7.8 | |
| 14 | FlowSavvyWeb · Android · iPhone | Three bars | — | 3 of 6 | Free | 7.8 | |
| 15 | TimeFinderWeb · Windows · Mac · Android · iPhone | Three bars | — | 5 of 6 | Free | 7.8 | |
| 16 | Samsung CalendarAndroid | One bar | — | 1 of 6 | Free | 7.7 | |
| 17 | FantasticaliPhone | Two bars | — | 1 of 6 | Free | 7.7 | |
| 18 | Calendars by ReaddleiPhone | Two bars | — | 1 of 6 | $1.67/mo | 7.6 | |
| 19 | VyteWeb · iPhone | Two bars | — | 2 of 6 | $8/mo | 7.6 | |
| 20 | DayOtterWeb · Android | Two bars | — | 2 of 6 | $9/mo | 7.6 | |
| 21 | DaybridgeAndroid · iPhone | Two bars | — | 2 of 6 | Free | 7.6 | |
| 22 | Trevor AIWeb | Two bars | — | 1 of 6 | $5/mo | 7.5 | |
| 23 | Clustra CalendarWeb | Two bars | — | 1 of 6 | $10/mo | 7.5 | |
| 24 | calprepWeb | Two bars | — | 1 of 6 | Free | 7.5 | |
| 25 | VimcaliPhone | Two bars | — | 1 of 6 | $35/mo | 7.5 |
Compare all 25 in a table
| # | App | Score | Free plan | From | Free plan | Paid from | Shared calendars | Time blocking |
|---|---|---|---|---|---|---|---|---|
| 1 | Mozilla Thunderbird | 9.0 | Free plan | Free | Yes | — | — | — |
| 2 | Microsoft Outlook Calendar | 8.2 | Free plan | $1.67/mo | Yes | $9.99/user/mo | Yes | — |
| 3 | Lark | 8.2 | Free plan | — | Yes | — | — | — |
| 4 | EGroupware | 8.2 | No | €21.90/mo | Yes | — | Yes | — |
| 5 | Proton Calendar | 8.0 | Free plan | Free | Yes | — | Yes | — |
| 6 | Teamup | 8.0 | Free plan | $12/mo | Yes | — | Yes | Yes |
| 7 | Cozi | 8.0 | Free plan | $3.25/mo | Yes | — | Yes | — |
| 8 | Calendar.com | 8.0 | Free plan | $20/mo | Yes | $20/user/mo | Yes | Yes |
| 9 | Notion Calendar | 7.9 | Free plan | Free | Yes | — | Yes | Yes |
| 10 | Doodle | 7.8 | Free plan | $11/mo | Yes | $11/user/mo | — | — |
| 11 | Tuta Calendar | 7.8 | Free plan | €3/mo | Yes | — | Yes | — |
| 12 | TimeTree | 7.8 | Free plan | $4.49/mo | Yes | — | Yes | — |
| 13 | Reclaim AI | 7.8 | Free plan | $10/mo | Yes | $12/user/mo | Yes | Yes |
| 14 | FlowSavvy | 7.8 | Free plan | — | Yes | $10/user/mo | — | — |
| 15 | TimeFinder | 7.8 | Free plan | Free | Yes | — | — | — |
| 16 | Samsung Calendar | 7.7 | Free plan | Free | Yes | — | Yes | — |
| 17 | Fantastical | 7.7 | Free plan | Free | Yes | — | Yes | Yes |
| 18 | Calendars by Readdle | 7.6 | Free plan | $1.67/mo | Yes | — | Yes | Yes |
| 19 | Vyte | 7.6 | Free plan | $8/mo | Yes | $8/user/mo | — | — |
| 20 | DayOtter | 7.6 | Free plan | $9/mo | Yes | $9/user/mo | — | — |
| 21 | Daybridge | 7.6 | Free plan | Free | Yes | — | Yes | Yes |
| 22 | Trevor AI | 7.5 | Free plan | $5/mo | Yes | — | — | — |
| 23 | Clustra Calendar | 7.5 | Free plan | $10/mo | Yes | $10/user/mo | — | — |
| 24 | calprep | 7.5 | Free plan | Free | Yes | — | — | Yes |
| 25 | Vimcal | 7.5 | Free plan | $35/mo | Yes | — | — | — |
Is your app on this list?
Numbered spots on this list can be sponsored, and a sponsored row is labelled as paid.
Questions about this list
Which calendar app is ranked first on Freedom251?
Mozilla Thunderbird is ranked #1 of 197 with a score of 9.0. Microsoft Outlook Calendar is second and Lark third.
How many of these have a free plan?
24 of the 25 on this page publish a free plan on their own pricing pages.
Which is the cheapest paid option?
On this page, Microsoft Outlook Calendar has the lowest first paid tier we found: $1.67/mo.
How is this list ranked?
Ranked free-and-open first: a usable free tier and open-source code, then the platforms it runs on and its documentation.