Your AI running coach. Transparent, private, and free.

We got tired of paying for training apps that feel like black boxes. Prun is fully transparent — you own your data, you see how it works, and you only pay for the AI credits you actually use.

100% Local & Private No Subscription AI-Powered Plans Strava & Whoop
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AI Coach
Personalized training plans generated by Claude AI, adapted to your fitness level and goals.
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Your Data, Your Device
Everything stays on your phone. No accounts, no servers storing your data, no tracking.
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VDOT-Based Training
Science-backed pace zones from Jack Daniels' formula. Race predictions that improve as you do.
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Strava & Whoop
Auto-sync your runs from Strava and recovery data from Whoop. Direct to your device.
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Calendar Sync
Push your training plan to Apple Calendar so workouts show up right in your day.
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Built-in Run Tracker
Track runs directly in Prun with live pace, distance, and audio coaching. No extra app needed.

How it works

From download to your first run in under 5 minutes.

1
Tell us about you
Your experience, weekly mileage, and race times. We calculate your VDOT.
2
Pick a goal
5K PR, half marathon, general fitness — your plan is built around what you want.
3
AI generates your plan
Claude builds a periodized training plan with the right mix of easy, tempo, and interval work.
4
Run and improve
Track runs, get coaching advice, and watch your VDOT climb as you get faster.

Pricing

No subscription. No hidden fees. Ever.

$0
Free — bring your own key

Prun is free. AI features use your own Claude API key — you pay Anthropic directly for what you use. A full training plan costs roughly $0.05–0.15 in API credits.

Coming soon: Don't want to set up an API key? You'll be able to pay a small fee to use Prun's AI features directly — no key needed.