App Lock: Fingerprint & PIN

Lending your phone shouldn't mean showing everything on it.

App Lock puts the apps you choose behind your fingerprint or a PIN. Your kid can play a game, a friend can look at a photo, a coworker can make a call, and your chats, gallery and messages stay closed. Anyone who opens a locked app meets your lock screen first.

Fingerprint and PIN locking is free.

LOCK ANY APP

• Chats, photos and gallery, messages, email, social apps, banking, the Play Store, even Settings

• Suggested apps first, so the ones that matter are a tap away

• Search every app on your phone

ONE TOUCH TO OPEN

• Your fingerprint opens a locked app in about a second

• Everyone else needs your 4- or 6-digit PIN

• Five wrong PINs in a row pause the lock screen for 30 seconds

APP LOCK LOCKS ITSELF

• Nobody can open App Lock to switch protection off without your PIN or fingerprint

ALWAYS ON

• Protection comes back by itself after a restart or an update

• Checks run only while the screen is on, and stop when it turns off, to spare your battery

PRIVATE BY DESIGN

• No account, no sign-up, no server

• Your PIN is stored only as a salted hash on your phone

• Your fingerprint never leaves Android's secure hardware; App Lock only learns whether it matched

• Which apps you lock and which apps you open never leave the phone

WHY IT ASKS FOR TWO PERMISSIONS

• Usage access: Android's way of telling App Lock which app you just opened. Read on the phone, never uploaded.

• Display over other apps: lets the lock screen appear on top of the app you opened.

FREE AND PRO

Free: fingerprint and PIN locking for up to three apps.

App Lock Pro adds:

• Lock as many apps as you like

• Choose when apps lock again: as soon as you leave, after 1 or 5 minutes, or when the screen turns off

• No ads

Pro is a subscription billed through Google Play. You can cancel any time in your Play account settings.