Plug in to focus. Plug in again to stop.

Leif is a small USB-C key for your Mac. Plug it in and the sites and apps you choose are blocked until you plug it back in. Take the key with you, leave it in another room, or hand it to a friend.

One key, three moves

  1. Plug in the key

    Your blocked sites stop loading in every browser and distracting apps quit. A small green dot in the menu bar shows a session is on.

  2. Unplug it and walk away

    The session keeps going without the key. Put it on your keychain, in a drawer, or in someone else's pocket.

  3. Plug it in again to finish

    Everything comes back. Leif records how long you actually worked, counting only the time you were at your Mac.

Built so you can't talk yourself out of it

You choose what's blocked

Pick sites and apps between sessions. During a session the list is locked, so you can't trim it at 11 pm.

Quitting doesn't end it

Leif runs in the background and restarts itself. A session ends when the key goes back in.

Lost the key?

You get five emergency ends a month. Type a short phrase to confirm, and the session ends like a normal one.

See where your time went

Today, this week, your streak, and the hour of the day you focus best.

Stays on your Mac

No account and no sign-in. Your sessions and block list never leave your computer.

Tabs already open don't sneak through

Chrome tabs on a blocked site are sent to a quiet Focus page, then brought back when you finish.

Smaller than your car key

Size
13 × 24 × 4.3 mm in its case, plus the USB-C plug
Connector
USB-C
Works with
Macs on macOS 13 Ventura or later, Apple silicon and Intel
Power
None needed. It runs off your Mac while plugged in.
App
Free Leif app for macOS, signed and notarized by Apple
What it stores
Its own serial number. Nothing else.

Pre-order the first batch

$39 Early-bird price. $49 after the first batch.

One key, its case, and the Leif app. US shipping only for now.

The first batch ships in about 4 weeks. You'll get an email when yours is on its way.

Cancel any time before it ships for a full refund, or return it within 30 days. Returns and refunds

Questions

Does it work on Windows, iPhone or iPad?

Not yet. Leif is Mac only for now.

Which browsers does it block?

All of them. Sites are blocked for the whole Mac at the network level, so Safari, Chrome, Firefox and Arc are covered. Chrome tabs that are already open also get sent to the Focus page.

What if I lose my key?

End the session with one of your five emergency ends that month. A new key pairs with your Mac in one click.

Can't I just delete the app?

Yes. Leif can't stop you from uninstalling it, and it isn't trying to. It adds enough friction that finishing the work becomes the easier choice.

Is it safe to plug into my Mac?

The key only tells your Mac its name and serial number. It has no storage and can't see your files. The first time, your Mac may ask "Allow accessory to connect?". Click Allow.

Does it need the internet or an account?

No. Everything happens on your Mac.