OI Calendar
Encrypted, decentralized alternative to Google calendar
OI Calendar launched on February 5, 2019 with 78 votes, #518 of 3,290 launches that month and more than 75% of that year's launches. The site was still online in September 2026, 7 years on.
What it does
OI Calendar is an encrypted, decentralized alternative to Google Calendar. It is your open source calendar in the cloud that belongs to you - as in your own Blockstack identity. Your data is only seen by you, your invited guests and in encrypted form your storage provider.
Private, encrypted calendar in the cloud using Blockstack, free and open source.
Does a similar job
all alternatives →
I built an open source web calendar inspired by the Google calendar2024 · schedule-x.dev · ▲232I 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.
hora CalendarJun 2026 · horacal.app · ▲132The Mac calendar Google never built. Fast, native, private — designed for people who find Apple Calendar too limited and everything else too much.



Automatic out-of-office calendar2020 · getclockwise.com · ▲94Just mark your calendar as OOO, we take care of the rest
More dev tools this month
the category →

open-source IDE for thoughtful software design. Contribute to devdotfast/whiteboard development by creating an account on GitHub.
Dev tools · 28d ago · github.com

Contribute to reladraw/reladraw development by creating an account on GitHub.
Dev tools · 26d ago · github.com
OpenBot▲362Grok Bot alternative: free, local, open-source, multiplayer
Dev tools · 23d ago · openbot.run
Talanoa▲346Hi HN, I’m a fullstack developer, and honestly, I’ve lost count of how many side projects I’ve worked on over the years. But one idea kept coming back to me: a different kind of email client. It first came to me in 2014: “What if we could handle emails more like conversations?” Every year, I’d revisit this concept in my “Build Notes.” Ten years later, no one had built exactly what I had in mind — so I finally decided to do it myself. That’s how Talanoa was born. I wanted something focused on people, not timelines. I was tired of marking messages as unread just to remember to reply later, or…
Dev tools · 20d ago · talanoa.email
CoreSpeed▲332One MCP for everything your agents need: apps, memory, tools
Dev tools · 28d ago · corespeed.io
Source: Product Hunt launch ↗
Launched alongside, February 2019
the whole month →- MY
Make your site’s pages instant in 1 minute and improve your conversion rate by 1%.
Life & fun · 2019 · instant.page




Computer generated people - refresh to get a new one
AI · 2019 · thispersondoesnotexist.com
