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About

A coach in your pocket.
Not a spreadsheet.

OpenPacemaker exists because serious runners deserve better than guesswork — and most of us can't afford a personal coach.

Strava tracks everything. But it doesn't coach you.

Strava is brilliant at recording your runs. It stores your data, shows your segments, gives you kudos. What it doesn't do is tell you whether you ran too hard yesterday, whether you're ready to race, or whether the workout you did actually matched your training plan. It's a logbook, not a coach.

Human coaches are expensive.

A good running coach charges £100–300 a month. They'll review your week, adjust your plan, and answer your questions — but probably not at 6am when you're about to head out the door, and not the moment you finish a tough interval session and want to know if it went well.

Generic training plans don't know you.

Free plans from the internet don't know your injury history, your race date, your work schedule, or the fact that you had a terrible sleep last night. They're a starting point, not a conversation.

OpenPacemaker fills the gap.

It connects your Strava data to Claude AI and gives you a coach that lives in Telegram — always available, always up to date with your training, and able to answer questions in plain English.

Ask it how your long run looked. Ask if you're overtraining. Ask it to adapt your plan around a work trip. It knows your zones, your history, your injuries, and your goals. It remembers everything you've told it — so you never have to repeat yourself.

It's not a replacement for a human coach if you're an elite athlete with specific needs. But for the millions of runners who want honest, personalised feedback without the price tag — it's the next best thing.

OpenPacemaker is open source. Built by a runner, for runners. No ads, no data selling, no subscription. Your Strava data stays yours — you can delete it any time with a single command.
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About the author

Dariusz Kabulski

I started running in 2007 — before Strava existed, before GPS watches were affordable, before anyone had heard of a training load metric. Back then you ran by feel, kept a paper log if you were disciplined, and got coaching if you were lucky enough to find someone good and afford it.

Over the years I've worked with several running coaches, followed structured plans, experimented with periodisation, made all the classic mistakes — too much too soon, racing when tired, ignoring niggles — and learned what actually moves the needle. What I kept wishing existed was something that combined that coaching knowledge with my actual training data and was available right now, not at the next weekly check-in.

I'm also a software engineer. When AI got good enough to hold a real coaching conversation, I built it. OpenPacemaker is the tool I always wanted as a runner.

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