Your most important papers.
Nobody else’s.
UnderKey keeps your ID, passport, car papers and crypto seed phrases in an encrypted vault that never leaves your phone. Draw a pattern — that’s the only key.
- Free for 10 items
- No sign-up, no email
- Nothing leaves your phone
Draw your pattern
Try it — connect any 4+ dots
Locked.
0 files encrypted with AES-256.
They exist only on this phone.
- No cloud, no account
- Only your pattern opens it
- Encrypted with your pattern
- 1Draw
- 2Select
- 3Lock
Everything worth
protecting.
The documents you’d panic about losing — and would hate to see leaked. Kept together, encrypted, and one pattern away.
Passports
Data page, visas, residence permits.
ID cards
Front, back and the numbers you always forget.
Car papers
Registration, inspection, insurance, driving licence.
Seed phrases
12 or 24 words, kept offline and out of cloud backups.
Certificates
Birth, marriage, diplomas, medical cards.
Secure notes
PINs, codes and anything you can’t lose.
Serious encryption that feels
like unlocking your phone.
On-device AES-256
Files and metadata are encrypted on your phone. No servers, no shared keys — not even we can read them.
AES-256 · key derived from your pattern · stored nowhere One pattern, one vault
Every pattern opens a different vault. Need a decoy? Just draw another pattern.
Expiry reminders
Never miss a passport, ID or insurance renewal. Reminders are local and never reveal what expires.
Seed phrases & notes
Store crypto recovery phrases offline, away from cloud backups and your photo roll.
Scan or photograph
Document scanner with auto edge detection, or import from Photos and Files. OCR suggests expiry dates on-device.
Auto-lock & protection
Locks the moment you leave the app and blocks screen capture on Android.
One pattern.
Different worlds.
There is no list of vaults to give you away. Every pattern opens its own encrypted space, so a second, harmless vault is just another shape you draw.
Never get caught
with an expired passport.
Add an expiry date once. UnderKey reminds you well ahead — locally, without the notification revealing what’s about to expire.
Your seed phrase,
off the internet.
Type your 12 or 24 words once. UnderKey encrypts them on your phone and keeps them away from cloud backups and your photo roll.
Still keep a paper or metal backup. Why both matter →
Three steps. No setup.
- i.
Draw your pattern
Your pattern derives the key that encrypts the vault. It isn’t stored anywhere.
- ii.
Add your documents
Use the document scanner or import from Photos and Files. Everything is encrypted as it enters.
- iii.
Leave the app
It locks instantly. Your documents stay encrypted on your phone — nowhere else.
Start free. Stay private.
Free for up to 10 items. All encryption, decoy vaults, and reminders included. Pro removes the limit.
Try Pro with no commitment.
Less than $2 a month.
Pay once. Yours forever.
Store it properly.
Where to Store a Crypto Seed Phrase Safely (2026 Guide)
Paper, metal, password managers or an offline encrypted vault? The trade-offs of every way to store your 12/24-word recovery phrase.
Read guide →Should You Keep a Digital Copy of Your Passport? How to Do It Safely
Why a digital passport copy saves your trip when the original is lost — and how to store it without leaking it to the cloud.
Read guide →How to Hide Photos on iPhone (Really Hide Them)
The built-in Hidden album, Locked Notes, and encrypted vault apps compared — what actually keeps private photos private.
Read guide →Lost Your Passport Abroad? What to Do, Step by Step
Lost or stolen passport while travelling: police report, embassy, emergency travel document, cancelling the old one, and how to make it easier next time.
Read guide →Good questions.
Do I need an account?
No. There is no sign-up, no email and no login. You open the app, draw a pattern and your vault exists — only on your phone.
Can UnderKey see my documents?
No. Everything is encrypted with AES-256 on your device and never sent to a server. We don’t run one that could receive your files.
How do decoy vaults work?
Each pattern opens its own vault. Draw a second pattern, put a few harmless documents in it, and that’s the vault you open if someone insists.
What if I lose my phone?
UnderKey keeps nothing in the cloud, so there is no online copy for anyone to find — including you. Keep printed copies of truly critical documents somewhere safe.
Is it really free?
Yes, for up to 10 items total. All encryption, decoy vaults, and reminders are included. Pro removes the limit.