FREEDOM251

Freedom251 › Productivity

Free and open first

Best Calendar Apps in 2026

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.

  1. 1

    EGroupware

    by EGroupware
    Free plan Open source AndroidAPIiPhone+5

    EGroupware combines calendar collaboration with video meeting support and a choice of free and paid plans. Check the plan’s storage, concurrent-user requirements, and VAT terms before choosing.

    9.1 Free plan · paid from €21.90/mo · 30-day trial Visit site
  2. 2

    Twake Calendar

    by Twake Calendar
    Free plan Open source AndroidAPIiPhone+5

    Twake Calendar combines shared scheduling, delegation, booking availability, and meeting integrations across desktop, mobile, and web platforms.

    9.1 Free plan · paid from €4/mo Visit site
  3. 3

    Mozilla Thunderbird

    by Mozilla Thunderbird
    Free plan Open source AndroidLinuxMac+1

    Thunderbird combines multi-account email with calendar, contacts and task tools, with desktop offline access and message scheduling. It is free and open-source, with Android listed for mobile use.

    9.1 Free plan Visit site
  4. 4

    Microsoft Outlook Calendar

    by Microsoft Outlook Calendar
    Free plan AndroidiPhoneMac+1

    Outlook Calendar pairs calendar access with a free email plan and connections to several mail services.

    7.7 Free plan · paid from $9.99/user/mo · 30-day trial Visit site
  5. 5

    Tuta Calendar

    by Tuta Calendar
    Free plan AndroidiPhoneLinux+3

    Choose Tuta Calendar if you want a mobile calendar with sharing and plan allowances that scale from 1 to 500 GB of storage.

    7.7 Free plan · paid from €3/user/mo Visit site
  6. 6

    Lark

    by Lark
    Free plan AndroidAPIiPhone+4

    Lark combines workplace messaging, collaboration, automation, and developer tools across major desktop and mobile platforms.

    7.7 Free plan Visit site
  7. 7

    Teamup

    by TeamUp
    Free plan AndroidAPIiPhone+4

    Teamup offers a broad set of views, sharing controls, and event details for group scheduling. Check the plan limits and hosting model if your team needs more users or private-server hosting.

    7.7 Free plan · paid from $12/mo (annual) · 3-day trial Visit site
  8. 8

    Calendar.com

    by Calendar.com
    Free plan AndroidAPIExtension+2

    Calendar.com combines calendar connections, booking tools, and automation for individuals and teams. Compare the user caps and plan-specific support or security controls before selecting a paid tier.

    7.6 Free plan · paid from $20/mo · 14-day trial Visit site
  9. 9

    TimeFinder

    by TimeFinder
    Free plan AndroidiPhoneMac+2

    Pick TimeFinder if you want a personal time-blocking planner with reusable schedules, rollover, calendar sync, and focus sessions.

    7.6 Free plan · 7-day trial Visit site
  10. 10

    Structured

    Free plan AndroidiPhoneMac+1

    Choose Structured if a visual timeline that combines tasks and calendar events suits the way you plan your day.

    7.6 Free plan · 3-day trial Visit site
  11. 11

    Musubi

    by Musubi
    Free plan AndroidiPhoneSelf-hosted+1

    Musubi combines calendar connections, shared events, tasks, and mobile apps, and it is free during early access.

    7.6 Free plan Visit site
  12. 12

    Daybridge

    by Daybridge
    Free plan AndroidiPhoneMac+1

    Daybridge offers several ways to organize calendars and plans across connected accounts, including offline editing.

    7.6 Free plan · 7-day trial Visit site
  13. 13

    Zoho Calendar

    by Zoho Calendar
    Free plan AndroidiPhoneWeb

    Zoho Calendar combines scheduling, shared team calendars, and appointment booking with a free entry plan. Check the one-link limit if you need multiple booking pages.

    7.5 Free plan Visit site
  14. 14

    Cozi

    by Cozi
    Free plan AndroidiPhoneWeb

    Cozi combines family calendars and lists with a recipe library, and paid plans add reminders or AI-powered tools. Consider its one-way calendar sync and the plan limits when choosing a tier.

    7.5 Free plan · paid from $39/yr · 14-day trial Visit site
  15. 15

    TimeTree

    by TimeTree
    Free plan AndroidiPhoneWeb

    TimeTree covers shared calendars and group coordination on mobile and web, with several core tools on its free plan.

    7.5 Free plan · paid from $4.49/mo Visit site
  16. 16

    Fantastical

    Free plan iPhoneMacWindows

    Choose Fantastical if you want calendars, tasks, and meeting coordination together, with support for multiple calendar accounts and scheduling tools.

    7.5 Free plan · 14-day trial Visit site
  17. 17

    FlowSavvy

    Free plan AndroidiPhoneWeb

    FlowSavvy is centered on automatically scheduling tasks while leaving calendar events untouched.

    7.5 Free plan · paid from $10/user/mo (annual) · 7-day trial Visit site
  18. 18

    Amie

    Free plan APIExtensioniPhone+3

    Choose Amie if you want meeting notes, to-dos, and AI scheduling in one workday tool. Look elsewhere if you need to compare published Pro or Business prices before choosing a paid plan.

    7.5 Free plan · 7-day trial Visit site
  19. 19

    Vimcal

    Free plan iPhoneMacWeb+1

    Vimcal focuses on fast scheduling, unified calendars, and time-zone coordination. Its free tier is narrow, while paid and EA plans add desktop, team, and assistant-oriented tools.

    7.5 Free plan · paid from $35/mo Visit site
  20. 20

    Tweek

    by Tweek
    Free plan AndroidiPhoneMac+1

    Tweek combines task planning with shared calendars and several reminder and integration options.

    7.5 Free plan · paid from $5.99/user/mo · 14-day trial Visit site
  21. 21

    WebCalendar

    by WebCalendar
    Free plan APILinuxSelf-hosted+1

    WebCalendar offers broad scheduling, sharing, import, and publishing features in a self-hosted package. Its lack of CalDAV and required server components may affect deployment decisions.

    7.5 Free plan Visit site
  22. 22

    OnTime Group Calendar

    by OnTime Group Calendar
    Free plan AndroidAPIiPhone+4

    OnTime Group Calendar combines cross-platform calendar views with scheduling, meeting, and availability tools.

    7.5 Free plan · 60-day trial Visit site
  23. 23

    Rise Calendar

    by Rise Calendar
    Free plan AndroidiPhoneMac+1

    Rise Calendar brought scheduling and project work into one product, with broad platform support and integrations. Its shutdown and planned data deletion mean it is not an available choice now.

    7.5 Free plan · paid from €10/user/mo (annual) Visit site
  24. 24

    CalenGoo

    by CalenGoo
    Free plan AndroidiPhoneLinux+3

    CalenGoo combines cross-platform calendar management with detailed desktop editing and a separate appointment-booking system.

    7.5 3-day trial Visit site
  25. 25

    Informant

    Free plan AndroidExtensioniPhone+2

    Informant offers broad personal-planning features with cross-platform access and detailed iOS tools. Buyers should note the free-plan limits, separate Sync billing, and lack of shared calendars.

    7.5 Free plan · paid from $3.99/user/mo · 7-day trial Visit site

#1Places #1, #2, #3, #4, #5 on this list can be bought by the makers of the software on it. See the price

More in Productivity