Butler app icon
On Google Play

Butler

Two-factor codes. Nothing else.

A simple, private authenticator. Butler works completely offline, needs no account, and never collects a thing.

For Android. Butler 2, shown here, is on its way to Google Play.

One code

The code you need, front and centre.

Butler shows one big code instead of a long list, with a countdown and the next code already waiting. Every other account is a tap away.

Butler's home screen, with one large code and a grid of accounts
The shredder

Used once, then shredded.

When a code expires, Butler destroys it right in front of you, so you can see each one only ever works once.

An expired code being shredded
How it works

A code is only math.

Your secret plus the current time makes the six digits. No server takes part, so Butler never needs one.

A screen explaining how a code is made from a secret and the time
Nothing to break into

So nothing has to leave.

A synced authenticator puts every key behind one account. Butler has no account, no analytics or ads, no servers, and no permission to use the internet at all.

A list: no account, no analytics, no servers, no internet permission
Proof

Proof, not promises.

A Proof screen shows what Butler is really doing: internet permission never requested, every secret encrypted, copied codes cleared after 30 seconds, and screenshots blocked.

The Proof screen, listing Butler's permissions and protections
Backups you keep

Six words bring it all back.

Save an encrypted backup wherever you like. On any device, your six-word recovery phrase opens it. Nobody else can reset it, so nobody else can get in.

A six-word recovery phrase for an encrypted backup
And more

Quiet, careful details.

App lock

Unlock Butler with your fingerprint, face or phone PIN, so a borrowed phone doesn't mean borrowed codes.

Screenshots blocked

Codes and secrets stay out of screenshots and the recent apps view, by default.

A clipboard that forgets

Copied codes are cleared after 30 seconds.

Works offline

Codes come from your phone's clock, so Butler works on a plane, in a basement, anywhere.

Every screen size

Layouts made for phones, tablets, landscape and foldables.

No sign-ups

Open it and add your first account. There's nothing to register.

Get Butler for Android.

Free on Google Play. Your accounts carry over to Butler 2.

Get it on Google Play