Umbra
Android privacy, disguised

Your private phone,
hidden in a calculator.

Umbra disguises a second, fully separate Android phone behind a working calculator. Type your secret code to reveal it. Everyone else — a border agent, a controlling partner, a thief — just sees a calculator.

Download free — check your phone See plans & pricing

Free to install · Confirm your phone is supported before anything is reset · No account, no email

How it works

Three ideas, no technical setup to understand.

Looks like a calculator

It is a real calculator. No hidden icon, no suspicious app — it does math like any other.

A secret code reveals it

Type your code and press = to switch to a completely separate phone — its own apps, photos and accounts. A return code switches back.

Nobody can tell it's there

Built on Android's Device Owner + multi-user (no root). The user switcher is hidden, so the second phone stays invisible.

A panic code, too. Set an optional duress code. Under coercion it can quietly hide the hidden phone until you disarm it, or permanently wipe it. Your data is never trapped — returning to the decoy always works.

How to use it, step by step

It feels like a magic trick the first time. Swipe through the whole flow.

1 1,234 = a real calculator

Open it — it's a calculator

No hidden icon, no suspicious app. It does math like any other. Anyone can pick it up.

2 840719 = your code + =

Type your secret code, press =

Your code then = reveals the hidden phone. Type anything else and it just calculates — no hint that more exists.

3 9:41 your own apps, photos & accounts

You're in your private phone

A completely separate phone — its own apps, photos and logins. Nothing here is visible from the calculator side.

4 2025 = return code + =

Switch back in a second

Type your return code and = to drop back to the calculator / your normal phone. Instant, every time.

5 Hidden settings Change secret code Subscription · active Panic code Return code = press & hold =

Hidden settings: long-press =

After your code, press and hold = to change your code, check your subscription, or set up a panic code.

6 000000 panic code → locked (or wipe)

A panic code for emergencies

Forced to unlock? A second code instantly hides the hidden phone (default) or wipes it. Returning to the normal phone always still works.

That's the whole thing. Two codes you choose, one key (=). The hard part — making a truly separate, invisible phone — happens once during setup. After that it's just typing a number.

Made for real situations

When handing over a phone isn't really a choice — your private one stays invisible.

Border & airport checks

Hand over a phone that is, genuinely, just a calculator with a decoy phone behind it.

A controlling partner

Keep your own messages, photos and accounts truly separate — not just hidden in a folder.

Theft or a forced unlock

What a thief sees and unlocks is the decoy. The panic code can lock the real phone instantly.

Umbra is a privacy tool for protecting your own device. Use it lawfully.

Download & install

Umbra installs differently from normal apps — for good reason. Here's the setup, step by step.

Download the APK — it's free

Free to install. Open it once to check your phone is supported before you reset anything.

1 Umbra Supported this phone can run it …or “Not supported” check first — no reset

Check it's compatible

Install the APK and open it once. It says Supported or Not supported — before you reset anything.

2 Photos · Chats · Apps setup wipes the phone → back up first

Back up your phone

Setup needs a factory reset, which erases the device. Save your photos and data first.

3 👋 Hi there Welcome — let's set up ×6 tap the screen 6 times

Reset, then tap 6 times

Factory reset. On the Android welcome screen, tap the screen six times to open QR setup.

4 scan from your email

Scan your QR code

Scan the QR from your purchase confirmation. Android installs Umbra and activates your subscription in one step.

5 Set your secret code done! 🎉

Set your secret code

Choose the code that reveals your hidden phone, plus a return code. That's it — you're set.

Why a reset? Becoming the device "owner" (which lets the app create a truly separate, hidden phone) can only happen on a fresh device. It's a one-time step.

Pricing

Start free for 3 days. No account, no email — your license is an anonymous code.

Monthly

$4.99/mo
  • Full hidden phone
  • Panic code
  • Cancel anytime
Best for privacy

Annual

$39/yr
  • Everything in Monthly
  • ~35% cheaper
  • Shows on your statement only once a year

Prepaid code

Gift / no recurring
  • Buy months up front
  • No recurring charge ever
  • Redeem anonymously

Charges never read "Umbra" — they appear under Fizz Labs Co. / our payment processor.

FAQ

Which phones are supported?

Any Android phone that allows multiple users — Google Pixel, Android One, and AOSP-based phones generally do. Many Samsung consumer phones (especially Korean/carrier models) limit users to one and are not supported. The app checks your device for you before any reset. iPhone is not supported.

Do I need to create an account?

No. No account, no email. Your license is an anonymous code, and your subscription status only appears inside the hidden, code-protected settings.

Will anyone see "Umbra" on my card statement?

No. Charges appear under our payment processor / Fizz Labs Co., never "Umbra". Choose annual or a prepaid code to reduce how often a charge appears at all.

What is the panic code?

An optional second code for coercion. It can hide the hidden phone until you disarm it (default) or permanently wipe it. It never blocks returning to the normal phone, and never destroys the decoy.

Is this legal, and who is it for?

It's a privacy tool for people who need to keep their own personal phone private when handing over or sharing a device. Use it lawfully and in line with local rules.