Scrinium
Notes only you can read.
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Encrypted zero-knowledge Markdown editor that logs in everywhere. Your notes are private on every device — the server cannot read them. Free, unlimited sync. Free tier covers daily use, Pro unlocks features like Burner Notes, Dead Man's Switch, and more to come. Built for developers, journalists, researchers, and anyone whose notes are nobody else's business.
PH · launched Sep 21, 2026 · 1 upvote (top 69%) · 0 views
Niche: note-taking and writing apps · 264 launches, 27 in the last 7 days ▼ -23% · Explore this niche →
Category and tags
- Horizontal
- Communication
- B2C
- Not AI
- Commercial product
- Writing
- Notes
- Privacy
Visit website ↗ Source listing ↗
More like this: all 264 launches in note-taking and writing apps →
Could you build this?
Partial A rich Markdown editor and sync backend is easy to vibe code, but implementing a truly secure zero-knowledge cryptosystem (Argon2id, SRP-6a, and multi-tier authenticated encryption) requires specialized cryptographic engineering.
What it would actually take: A production version requires a robust web crypto architecture using WebCrypto or Libsodium, implementing Secure Remote Password (SRP) authentication to avoid handling plaintext secrets on servers, and managing client-side key derivation hierarchies (Argon2id to Master Key to Note Keys). Conflict-free encrypted data sync must also be implemented without leaking metadata or causing silent decryption failures across multi-device sessions.
Competitors
Other products that read as similar to this one : 242 launches clear the similarity bar, closest 8 shown.
Attention rank: #201 of 243 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).
Launched 293 days after the earliest competitor.
- Paragraph Notes · ph · 2026-09-26 · 154 upvotes · similarity 0.52
- Free Notepad · ph · 2026-10-21 · 2 upvotes · similarity 0.51
- Plainkeep · ph · 2026-11-01 · 2 upvotes · similarity 0.51
- NotepadWeb - Private Encrypted Notes · ph · 2026-10-06 · 1 upvotes · similarity 0.48
- Notes by Halo · ph · 2026-11-04 · 1 upvotes · similarity 0.48
- Jotura · ph · 2026-10-08 · 2 upvotes · similarity 0.47
- MinkNote · ph · 2026-07-24 · 157 upvotes · similarity 0.46
- Branchnote · ph · 2026-11-14 · 1 upvotes · similarity 0.46
The niche, labels, vibe code rating and competitor comparison on this page are analysis by Nicheloom. If you use them, please credit nicheloom.com. How you may use our data.