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Show HN: Ichinichi – One note per day, E2E encrypted, local-first

25•katspaugh•1h ago
Look, every journaling app out there wants you to organize things into folders and tags and templates. I just wanted to write something down every day.

So I built this. One note per day. That's the whole deal.

- Can't edit yesterday. What's done is done. Keeps you from fussing over old entries instead of writing today's.

- Year view with dots showing which days you actually wrote. It's a streak chart. Works better than it should.

- No signup required. Opens right up, stores everything locally in your browser. Optional cloud sync if you want it

- E2E encrypted with AES-GCM, zero-knowledge, the whole nine yards.

Tech-wise: React, TypeScript, Vite, Zustand, IndexedDB. Supabase for optional sync. Deployed on Cloudflare. PWA-capable.

The name means "one day" in Japanese (いちにち).

The read-only past turned out to be the thing that actually made me stick with it. Can't waste time perfecting yesterday if yesterday won't let you in.

Live at https://ichinichi.app | Source: https://github.com/katspaugh/ichinichi

Comments

redgridtactical•44m ago
The read-only past is a really smart design choice. I build local-first apps and it's always tempting to add edit-everything flexibility, but constraints like this are what keep a tool focused and actually useful.

How does the Supabase sync work with the E2E encryption? Client-side encrypt before anything leaves the browser?

katspaugh•36m ago
Thanks! Exactly, client encrypts before syncing. Decryption keys are wrapped/encrypted with your password. If you change the password, only the decryption keys are re-encrypted, not your notes.
jcynix•31m ago
Nice, and I like the idea that the past is fixed, but ... is there a way to define the point of rollover to the next day? My "days" sometimes end at 0:50 for example and not at 23:59. So I might summarize the day a bit after midnight.
katspaugh•30m ago
Good idea, I can do that!
elxr•23m ago
How does the E2E work in terms of user flow? I assume a you need a password?

Do you need to enter the password every time you open this?

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