Hushpad — Hidden Contacts & Notes

Encrypted. Hidden. Secure.

On the surface, a fully working calculator. Opened the way only the owner knows — from inside the app itself — it switches to an encrypted contacts list and a private notes area. Sensitive contacts and notes are stored locally with AES-256-GCM.

Design principles

• Fully local — no backend, no account, no cloud sync, no analytics. Data lives only on the device.
• No account = no leak — nothing is stored on a company server, so there’s nothing to leak.
• Multiple profiles — alongside the owner’s profile, a guest profile; the two sides can’t see each other’s data.
• Emergency wipe — a second path that destroys all data with a single gesture when needed.
• 15 languages — TR, EN, ES, PT, RU, DE, FR, AR, HI, ZH-CN/TW, JA, KO, ID, VI.

Operational details are deliberately kept out of the public docs — security at this level isn’t defined by “secret mechanisms” but by the strength of the user’s PIN.

Karmity’s part

I designed the encryption flow; the trickiest UX part — the rules around camouflage transitions — we worked out together. The Flutter state architecture is also largely shared work.