Spam calls stop at the door

A call blocker for Android that does its job without collecting a thing about you.

No internet permission  ·  No account  ·  No ads

Built to block, not to harvest

Most caller-ID apps build their spam directories out of their users' address books. Call Avert takes a different approach: it cannot send data anywhere, because it was built without the permission that would let it.

Four ways to block

Reject the call, send it straight to voicemail, let it ring silently, or answer and hang up instantly so the caller never reaches your voicemail at all.

Block by pattern

Block a single number, an entire area code, or any number starting with a prefix you choose — useful when a spammer cycles through a range.

Do Not Disturb schedule

Silence unknown callers during set hours, with an optional exception that lets a genuine repeat caller through.

Contacts always get through

Allow everyone in your contacts, or just your favourites, so the people who matter are never caught by a rule.

Encrypted on device

Your blocked list and history live in an AES-256 encrypted database, with the key held in your phone's hardware-backed keystore.

Locked behind biometrics

Optionally require your fingerprint, face, or PIN before the app will open.

What we never do

Every claim below is enforced by Android, not just promised by us. You can check each one in the app's permission list before you install.

Never uploads your contacts The app has no way to reach a network, so your address book stays where it is.
Never records or listens to calls Call Avert holds no microphone permission of any kind.
Never tracks or profiles you No analytics, no advertising SDKs, no crash reporting, no identifiers.
Never blocks an emergency call Calls from emergency services always ring through, and dialling 911 suspends blocking so a dispatcher can call you back.