Onin – E2EE calendar and chat app
Hey HN! Ryan here (co-founder of YC-backed Muzz). I’m now building Onin, an end-to-end encrypted calendar and chat app that makes organising your personal and social life simple and secure. I’ve been building technology businesses for 10+ years and have witnessed the reoccurring problem that digital calendars were built for companies, not people. They feel cold, transactional, and anti-social — not the thing of dreams for planning your personal life. They also lack the security we now come to expect from consumer products. Onin is the first calendar to be fully E2EE, protecting not just your…
Onin – E2EE calendar and chat app launched on December 13, 2022 with 19 votes, #1,129 of 3,688 launches that month and more than 75% of that year's launches. The site was still online in September 2026, 3 years on.
In plain words
Onin is an end-to-end encrypted calendar and chat application designed for organizing personal and social life. It combines calendar scheduling with messaging features, with full E2EE encryption protecting events, messages, and user profiles. The app is built for individuals rather than enterprises, addressing the limitations of corporate-focused calendar tools by prioritizing privacy and personal communication alongside scheduling functionality.
written from the facts on this page · September 2026
From the sources
The chat-first, End-to-End Encrypted shared calendar for iPhone, iPad, Mac, and Android. 100,000+ families, couples, and groups keep every plan, change, and decision with the event it belongs to. Try free.
Every event has its own thread, every change posts automatically, and photos, notes, and decisions stay with the plan they belong to. Always End-to-End Encrypted . Every event has its own thread. Share photos, files, and notes without leaving the event. React, reply, and quote just like a messenger, but everything stays in context instead of scattered across WhatsApp, iMessage, and email. Every change posts a before-and-after update automatically, and reminders reach everyone who needs them. No more “wait, did you move that?” buried in a group chat. Every member gets a colour. See your kids’ activities, your partner’s shifts, and your own schedule in a single view, then pinch to zoom…from onin.co
In the maker’s words, at launch
Hey HN! Ryan here (co-founder of YC-backed Muzz). I’m now building Onin, an end-to-end encrypted calendar and chat app that makes organising your personal and social life simple and secure. I’ve been building technology businesses for 10+ years and have witnessed the reoccurring problem that digital calendars were…
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