Alternatives

Products that do what Keeper.sh does

Open-Source Calendar Syncing for Google, Outlook & iCloud

1. 1
   SavvyCal for iCloud▲293

   Scheduling links for iCloud, plus Google, Outlook, Fastmail

   2021

2. 2
   Outlook Google Calendar Sync for Mac▲83

   Sync Outlook calendars to Google on your Mac

   16d ago · outlookgooglecalendarsyncmac.com

3. 3
   OneCal▲125

   Synchronise Outlook and Google Calendars

   2023

4. 4
   CalendarPipe▲155

   Programmable calendar sync for humans and AI agents

   Apr 2026 · calendarpipe.com

5. 5
   Notion Calendar▲1,198

   Beautifully designed for your work and life

   2024 · notion.so

6. 6
   Notion Calendar Sync▲283

   2-way sync between Notion and your Google Calendar

   2021

7. 7
   ShadowCal▲95

   Sync your Outlook Calendar to Google Calendar

   2025

8. 8
   Google Calendar▲410

   Spend less time managing your day, now on iOS

   2015

9. 9
   Button for Google Calendar™▲530

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

   2021

10. 10
    Timely▲176

    Pull your calendar availability in 3 seconds

    Jul 2026 · trytimely.co

11. 11IB
    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

12. 12
    OI Calendar▲78

    Encrypted, decentralized alternative to Google calendar

    2019

13. 13
    Available▲315

    Share your calendar availability right inside of Gmail

    2020

14. 14
    Calendar Signatures by Warmly▲307

    LinkedIn insights right in your calendar, 100% free

    2021

15. 15
    Calendly for Chrome▲250

    Schedule meetings without leaving your inbox

    2018

16. 16
    Chronock▲110

    Scheduling and calendar sync, all in one

    22d ago · chronock.ai

17. 17
    Sunsama for macOS▲265

    If Trello & Google Calendar had a baby - now for Mac

    2018

18. 18
    Best Reminder App Chrome Extension▲125

    Cloud Sync: Reminders across devices, plus email alerts.

    2025

19. 19
    Automatic out-of-office calendar▲94

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

    2020

20. 20
    Nook Calendar▲314

    Own your time, reclaim your attention

    2022

21. 21
    Astro 3.0▲264

    Intelligent inbox and calendar for iOS, Android, Mac & Slack

    2018

22. 22
    Add to Calendar Link Generator▲151

    Create buttons for Google Calendar, Office 365 and Apple Cal

    2021

23. 23
    TextMarley▲136

    iMessage-based reminders integrated with Google Calendar

    2025

24. 24
    SyncThemCalendars▲83

    Setup a synchronization between calendars

    2019

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