ChainDownload for Windows

Everyone has a castle in the air.

The goal you dream about but never quite start. Chain is a focus timer that helps you build it, one session at a time.

Chain puts the foundations under it.

Name your goal. Light the forge and focus. Every session lays stone beneath it.

Bank it, and it sets in stone.

Done? Bank the session. Twenty minutes secures the day and adds a link to your chain.

Twenty minutes a day.

That’s the whole rule. The chain grows, and the stone climbs to meet the dream.

Day 30 · 30-link chain

Miss a day, and the chain breaks.

Start a new one tomorrow.

Chain 30

What you built stays.

Your levels, your titles and every stone you laid are yours for good.

Level 4 · 13 hours · all kept

Hours become a castle.

Level up, earn titles, strike medals. What’s above the clouds, you find out yourself.

KindlingLevel 5 · 13 hours

This castle is mine.

Build Chain.— Boris, the First Smith

I built Chain with Chain, one session at a time. Still building.

Why I built it

What’s your castle?

Start building. Free in beta for Windows.

Download for Windows

The app

The timer, and everything it builds.

Chain runs beside your work on Windows, with an Android playtest coming soon. It works offline, needs no account and is free while in beta.

Chain's Today screen: a 150-day chain, the active goal and the Go again button
Chain for Android: today's chain, the active goal and Hold to light the forge

Today. Your chain, the goal it serves, and one button to start.

Rewards

Earned, never bought.

Timer finishes, chain metals, calling cards, sounds and celebrations, all unlocked by focus. Most stay sealed until you get there.

Timer finishes

Refine your ring with materials you find while you focus. Try one.

Cast · default timer

How materials work

Every completed 20 minutes earns a strike: a chance to find materials. Completed hours, two-hour blocks and three-hour blocks add extra strikes. More chances; unchanged rarity odds.

18 Copper6 IronChased finish

Save materials across sessions, then spend them on finishes. This recipe takes more than the website demo.

Calling cards

Some milestones unlock a card to wear beside your name.

Wildfire, a collectible foil with flowing flame-colored lightWildfireCollectible calling card
  1. Boris5832:18 deep · Build Chain14.3h
    Current chain
    36 days
    Lifetime focus
    1,000 hours

    Focusing on Build Chain · illustrative session

Sample profile

Chain metals

Dress every link.

Embervein, an earned chain style with glowing copper details

More, sealed.

Faces, celebrations and sounds you only see once you’ve earned them.

The Guild

Other castles are going up.

Add friends to see who’s focusing right now, what they’re working toward and the week’s hours.

Friends are optional. Your castle is yours either way.

Friends leaderboardSample board

1 friend focusing nowThis week

  1. Boris5832:18 deep · Build Chain14h 20m
    Current chain
    36 days
    Lifetime focus
    1,000 hours

    Focusing on Build Chain · illustrative session

  2. Sam184h 40m
    Current chain
    12 days
    Lifetime focus
    120 hours
  3. You21h 40m
    Current chain
    7 days
    Lifetime focus
    2h 20m

Select a friend for details.

Free in beta · No account needed

Start building.

Get Chain for Windows and turn your focus into something you can see.

Fresh from the forge

Still being built. Still getting better.

Chain is easier to start with and says things in plainer words. Every ring climbs to a Masterwork, every grain you collect counts, and your finished castles share one sky.

Windows 1.1.4

See what’s new
Chain's stone castle rising under its glass blueprint, surrounded by a metal chain

Why

Why I built Chain.

I’d hooked myself on building the thing that was hooking me.

I've struggled with focus for as long as I can remember. At school, I never did my homework (seriously). Partly because I hated it, sure. But even the things I wanted to do — making videos, reading, building things — were hard to start and harder to finish. Somehow, entire days of games and YouTube required no such effort.

Chain started while I was finishing my bachelor's, with about twenty things I wanted to build and a tiny amount of focused time to divide between them. Plenty of ambition. Very little moving.

I'd read Deep Work and Atomic Habits. Watched every video about dopamine on the internet. Todoist and Notion organized everything I wanted to do. I understood the advice and I had the tools. Sitting down and doing it was the bit I couldn't manage.

So I built Chain around a desperate question: could I make focus as addictive as a game? I wanted that "one more round" feeling, but for something I cared about doing.

Then things got a little ridiculous. I started using Chain to build Chain. The better it got, the more I wanted to focus; the more I focused, the better it got. I'd hooked myself on building the thing that was hooking me.

— Boris, the First Smith

FAQ

Questions, answered.

What if I miss a day?

Your streak resets. Your XP, levels, hours and rewards stay.

How long should I focus?

20 minutes secures today’s link. Longer sessions earn more progress, with a maximum of one link per day.

What does it cost?

Free during beta — no ads, and nothing to buy inside the app today. Chain will have to pay for itself eventually; whatever you have already earned stays yours.

Do I need an account?

No. Focus offline without an account. Create one for sync and friends; delete it in Settings.

Does it block websites?

No. On Windows, Chain runs alongside your work. On Android, switching apps ends the session; locking your screen is fine.

Where can I use it?

Windows 10 and 11 from the Microsoft Store (or a direct installer if the Store is blocked), and an open Android playtest on Google Play: join the testers group, then opt in. Mac and iOS aren’t available.

Something else, feedback or business? hello@chainsmith.app