Lock that actually locks
PIN + fingerprint + auto-lock. Wrong-PIN photo capture + decoy vault option.
Google Keep, diary apps and expense trackers are free because YOUR data is the product — ads, profiling, cloud scans. A personal vault app keeps everything on YOUR phone (+ encrypted backup only you hold): open with fingerprint, write diary, track money, scan documents, set medicine/EMI reminders — nobody else sees a byte.
I build it tiny, fast and offline-first: opens in 1 second, works in flight mode, auto-locks in 30 seconds, decoy PIN option, and one-tap PDF export. Same on-device encryption engine proven in MService enterprise apps.
Who is this for?
- Anyone wanting a private diary/journal
- Doctors, CAs, lawyers (client notes)
- Shop owners (udhari + expense book)
- Seniors (medicines + documents)
- Students (study notes + goals)
6 reasons this app grows your business
Everything in one vault
Notes, diary with mood + photos, expense book, document scans, passwords section.
100% offline, 100% yours
Works in flight mode. Backup is encrypted file YOU keep — no account, no ads, no tracking.
Reminders that care
Medicine, EMI, birthday, water-plant — loud Tamil voice + push, snooze-friendly.
Find in 2 seconds
Search across notes, tags, dates + favourites. Export any note as neat PDF on WhatsApp/print.
Simple for everyone
Big text mode, Tamil + English, 3-tab layout. If you use WhatsApp, you can use this.
What your app includes
- PIN + fingerprint + auto-lock + decoy vault
- Notes, diary, expenses & document scans
- Reminders with Tamil voice alerts
- Offline-first + encrypted backup file
- Search, tags, favourites & PDF export
- Big-text & senior-friendly mode
How we launch in 4 simple steps
- Day 1 — Free 20-min call: you explain your idea, I note scope + fixed price.
- Week 1 — Demo screens: tap-through design on your phone, unlimited tweaks.
- Weekly builds: install APK/TestFlight, give feedback, I refine + backend.
- Launch + growth: Play Store ASO, analytics, 30-day free support.
Questions owners ask me
Where is my data stored?
On your phone by default, encrypted. Optional encrypted backup to YOUR Google Drive or your computer — never on my server, never mined.
Forgot PIN — data lost?
No. Recovery via your backup file + security questions you set. I cannot see your PIN or data — by design.
Can family share one app?
Yes — multi-profile with separate PINs: husband, wife, kids each get a private space in one app.
Play Store or APK?
Your choice: private APK (nobody else can install) or your own Play Store listing under your name.
Ready to put your business on every phone?
Contact me below with your idea — get fixed quote + launch plan in 24 hours. Pilot offer: free store ASO + launch checklist with every mobile app this month.
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Hire freelance mobile app developer in Chennai, India. Custom iOS & Android apps with React Native & Expo for local shop…
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