Alternatives

Products that do what OI Calendar does

Encrypted, decentralized alternative to Google calendar

1. 1IB
   I built an open source web calendar inspired by the Google calendar▲232

   I love the looks and UX of the Google calendar. But I wanted to have a version I could use more freely in my own projects, still looking similar to the one from Google.

   2024 · schedule-x.dev

2. 2
   hora Calendar▲132

   Google calendar built for the Mac

   Jun 2026 · horacal.app

3. 3
   Google Calendar▲410

   Spend less time managing your day, now on iOS

   2015

4. 4
   Notion Calendar▲1,198

   Beautifully designed for your work and life

   2024 · notion.so

5. 5
   Button for Google Calendar™▲530

   See your daily schedule and join meetings in one-click.

   2021

6. 6
   Secure Calendar▲75

   Privacy respecting calendar

   2019

7. 7
   CalendarPipe▲155

   Programmable calendar sync for humans and AI agents

   Apr 2026 · calendarpipe.com

8. 8
   Recal.dev▲365

   Resend, but for Calendar & Scheduling. API. SDK. MCP.

   Sep 2025

9. 9
   Rolo Calendar▲187

   A calendar for people who don't use calendars

   2016

10. 10
    Nook Calendar▲314

    Own your time, reclaim your attention

    2022

11. 11
    Automatic out-of-office calendar▲94

    Just mark your calendar as OOO, we take care of the rest

    2020

12. 12
    Calendar Signatures by Warmly▲307

    LinkedIn insights right in your calendar, 100% free

    2021

13. 13
    Weekly Calendar in Todoist▲265

    Make a clear weekly plan with time-blocked tasks and events

    2024

14. 14
    Add to Calendar Button v2▲159

    Let users add your events to their calendars, hustle-free

    2023

15. 15
    calendar.org▲81

    The NFT Calendar

    2022

16. 16
    Koalendar▲131

    Free online appointment scheduling software

    2021

17. 17
    Calendarist▲184

    Time blocking companion for Google Calendar

    2020

18. 18
    Timely▲176

    Pull your calendar availability in 3 seconds

    Jul 2026 · trytimely.co

19. 19
    ShadowCal▲95

    Sync your Outlook Calendar to Google Calendar

    2025

20. 20
    fwd2cal▲141

    Stop adding calendar events yourself

    2024

21. 21
    nocal for Google Calendar▲164

    A calendar that thinks like a workspace

    2025

22. 22
    The Non-App Calendar▲127

    A printable calendar for goal oriented planning

    2015

23. 23
    Chronock▲110

    Scheduling and calendar sync, all in one

    22d ago · chronock.ai

24. 24
    OneCal▲125

    Synchronise Outlook and Google Calendars

    2023

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