Alternatives

Products that do what CalendarPipe – programmable calendar sync via OAuth or email invites does

1. 1
   CalendarPipe▲155

   Programmable calendar sync for humans and AI agents

   Apr 2026

2. 2MA
   MeetingBar – A menu bar macOS app for calendar meetings▲131

   2020 · github.com

3. 3CM
   Convier.me – A Calendar Service for Developers▲116

   2021 · convier.me

4. 4BC
   Boomerang Calendar - a smart calendar assistant in your Gmail▲86

   2012 · boomerangcalendar.com

5. 5
   OI Calendar▲78

   Encrypted, decentralized alternative to Google calendar

   2019

6. 6CA
   Calendar API for Developers▲9

   2019 · campaigndays.com

7. 7RA
   Reclaim – an adaptive calendar app that plans time for your routines▲106

   2020 · reclaim.ai

8. 8
   Smart Calendars AI▲89

   Turn text, photos, voice into events & reminders in seconds

   2025

9. 9SI
   SpotOn.it - Synchronous Calendar Subscriptions▲7

   2014 · business.spoton.it

10. 10
    OneCal▲125

    Synchronise Outlook and Google Calendars

    2023

11. 11
    SyncThemCalendars▲83

    Setup a synchronization between calendars

    2019

12. 12NS
    Nettu Scheduler – A self-hosted calendar and scheduler server▲129

    2021 · github.com

13. 13
    ShadowCal▲95

    Sync your Outlook Calendar to Google Calendar

    2025

14. 14BA
    Building a 'liturgical lightbulb', bringing the Calendar to life▲109

    2024 · github.com

15. 15
    Canary▲57

    Sleek calendar app that makes scheduling a breeze

    2013

16. 16HA
    Hora – A Native SwiftUI Google Calendar Client for macOS▲5

    Apr 2026 · horacal.app

17. 17BA
    Building an E-Ink Calendar and a UI Toolkit along the way▲64

    2020 · rahulrav.com

18. 18
    HiveFlux + Slack▲93

    Real-time task management meets real-time communication

    2015

19. 19AC
    A Chrome desktop app for Google Calendar with a nice interface▲10

    2016 · chrome.google.com

20. 20FM
    Flute – my attempt at a better email API▲40

    2018 · flutemail.com

21. 21ES
    Easily Schedule with Busy People – Real-Time Calendar Sharing▲11

    2015 · web.meekan.com

22. 22FA
    Futurenda – AI Task Scheduler, Now with Google Calendar Sync▲13

    2017 · futurenda.com

23. 23MS
    Meekan, Slack scheduling robot: matches availability, syncs calendars▲16

    2015 · meekan.com

24. 24NA
    New API – Stripe for calendars▲5

    2014 · onediary.com

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