Alternatives

Products that do what Hash Calendar does

Client-only calendar, data in URL hash

1. 1
   Secure Calendar▲75

   Privacy respecting calendar

   2019

2. 2JA
   Just a Calendar: Simple Calendar to look at, no login, super light▲98

   2022 · calendar.sharats.me

3. 3
   Button for Google Calendar™▲530

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

   2021

4. 4
   Calendar Signatures by Warmly▲307

   LinkedIn insights right in your calendar, 100% free

   2021

5. 5
   OI Calendar▲78

   Encrypted, decentralized alternative to Google calendar

   2019

6. 6
   Google Calendar▲410

   Spend less time managing your day, now on iOS

   2015

7. 7
   Kin Calendar▲586

   The simple and connected calendar

   2016

8. 8AP
   A portable hash map in C▲176

   2024 · github.com

9. 9
   Routine Calendar▲451

   The calendar of the 21st century professionals

   2022

10. 10
    calendar.org▲81

    The NFT Calendar

    2022

11. 11
    Add to Calendar Button v2▲159

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

    2023

12. 12
    CalendarPipe▲155

    Programmable calendar sync for humans and AI agents

    Apr 2026 · calendarpipe.com

13. 13
    hora Calendar▲132

    Google calendar built for the Mac

    Jun 2026 · horacal.app

14. 14
    Recal.dev▲365

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

    Sep 2025

15. 15
    Nook Calendar▲314

    Own your time, reclaim your attention

    2022

16. 16IB
    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

17. 17
    Hashbase▲71

    Hosting for the peer-to-peer Web.

    2018

18. 18
    HASH▲127

    Build complex simulations quickly with modular components

    2020

19. 19
    Hashnode App▲238

    Stay connected with the global developer community

    2021

20. 20
    Calendar▲257

    Smart calendar that makes teams more productive

    2020

21. 21
    Hash (Twitter client)▲103

    Today's talking points

    2014

22. 22
    Private Notes for Google Calendar▲125

    Add private notes to Google Calendar events

    2024

23. 23AH
    A hash array-mapped trie implementation in C▲171

    Long-simmering side project that is finally ready to see the light. HAMTs are a cool persistent data structure and implementing one has been a lot of fun. Beyond the code, there is likely some value in the extensive and largely complete implementation docs; basic benchmarks are linked in the README, too. Kind of aiming to be "the libavl for HAMTs". That is obviously a high and aspirational bar but a distinct possibility if it stirs up a little interest and/or contribution. Anyways, it's time for this to go out, collect feedback and maybe even some use outside of toy projects. Let me…

    2023 · github.com

24. 24
    LinkCal▲1

    Share calendars via URL. No signup. No servers.

    Feb 2026 · linkcal.link

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