Website & app blocker for Windows

Block apps & websites on your Windows PC.

The desktop is where “just checking” becomes an afternoon. kadn blocks distracting apps and websites on Windows 10 and 11 with the same three levels as on your phone — and a seal that doesn’t care how you feel at 4pm.

Windows 10 & 11 · also on iPhone, Android & Mac

The honest part

On a PC, you are the administrator of your own wall.

Hosts file, extensions, a second browser — every classic method fails the same way: the person who built the wall can take it down.

Hosts file

The hosts-file rollback

Editing the hosts file is free and lasts exactly until the moment you edit it back. Admin rights make you warden and prisoner at once.

Extensions

The second-browser trick

A browser extension blocks one browser. Windows ships with another one. Downloading a third takes ninety seconds.

Willpower

Deep work by discipline

Eight hours at a machine that contains every distraction ever made. That’s not a fight discipline wins daily — it needs structure.

How kadn holds

System-wide blocking, not a browser plug-in.

kadn blocks desktop apps and websites across every browser on your PC — with the same three levels and the same asymmetry: tightening is instant, loosening waits.

Brakethe only level that always lets you through, by design

“Open anyway” starts a real, enforced 15-second pause, then the app opens for 5 minutes.

Code

Type a 16-character code by hand. No pasting, and a screenshot creates a new code. Getting in costs real effort, every time.

Blockeddoesn't negotiate

No self-serve way in. Your accountability partner can open one 15-minute window, at most once every 7 days — enforced on our server.

Seal your work-hours rule for the quarter. Until the date you chose it can’t be softened or switched off — and the block doesn’t live in a place you can edit back.

Every screen

One block. PC and phone.

The reflex just moves devices — kadn moves with it. One account, the same rules on Windows, Mac, iPhone and Android.

A pact runs one shared rule on every member’s devices — deep-work mornings, a launch week, a 90-day reset.

This Mac · Focus block

YouTubeBlocked

X / TwitterBlocked

RedditBlocked

Same rule as iPhoneuntil 13:00

Every method, honestly

What holds on Windows — and what doesn't.

Hosts file — free, reversible in 30 seconds

not editable when a rule is sealed

Browser extensions — blind to your other browsers

blocks apps and sites system-wide

Focus assist & timers — reminders, not walls

enforcement without an extend button

Cold-Turkey-style lockdown — hard, but desktop-only

the same wall continues on your phone

In their words

The problem, in their own words.

“Shipping daily commits and still avoiding the thing that actually moves the needle.”

Founder

“Freedom to quit.”

The dream underneath the focus

“Systems beat willpower.”

The whole idea

Voice-of-customer from published forums and surveys, not paid testimonials.

FAQ

Good to know.

Does it work on Windows 11?

Yes — kadn supports Windows 10 and 11, blocking desktop apps and websites in every browser with one set of rules.

Is kadn a Cold Turkey alternative?

If you love Cold Turkey’s hardness but want the block to follow you to your phone — and a human emergency door instead of none — that’s exactly the gap kadn fills.

Can I block websites but keep my work apps?

Yes. Rules cover exactly what you pick — block the feeds and news sites, keep Slack, your IDE and mail untouched, or give work apps their own softer rule.

What if I truly need a blocked site for work?

On Brake and Code you can get through with friction. On Blocked, your partner can open a 15-minute window — once every 7 days, enforced on our server.

Own your time

Your PC. Your rules. Kept.

Two minutes to set up, free for 7 days. The evening already looks different.

For founders · See every feature · Guide: Block websites