Stop guessing your race time.
PaceBrain predicts your race time, then builds the training to make you faster. Free to try, no signup.
Made for runners who…
PaceBrain isn't for everyone.
If you're running for fitness without a goal, save your money. If any of these sound like you, keep reading.
You have a goal time
Sub-4 marathon. Sub-50 10K. A specific number that means something to you.
You have a race on the calendar
8 weeks out, 16 weeks out, six months. The date is real and the doubt is real.
You want to know what you're actually capable of
Not a wishful guess. The number your last 90 days of training has earned you.
The PaceBrain loop
Predict it. Diagnose it. Train it. Repeat.
Other calculators give you a number and walk away. PaceBrain closes the loop — every prediction comes with a plan to make it faster.
See the time your training has earned
Paste any recent race — 5K parkrun, half marathon, 10K. We run six prediction models and give you one honest number with a confidence range.
See exactly what's between you and your goal
Performance DNA shows whether you're an endurance runner or a speed runner. We compare you against your goal pace and tell you the specific gap to close.
Follow a plan built for your gap, not a generic one
Your AI plan adapts every week based on what you actually ran, your recovery, and how the prediction is moving. Watch your number get faster.
"But I already use…"
Here's how PaceBrain fits next to the tools you already pay for.
What you get inside
Six tools that change how you train. Eleven more under the hood.
Know if today is a green-light day
A daily readiness score that tells you whether to push, hold, or rest — before you head out.
See whether you're built for speed or endurance
A profile of your running physiology. We train the gap, not the strength.
Race-specific pacing for your actual course
Hills, weather, your fatigue model. A pacing plan that knows the difference between Boston and Berlin.
Plans that change when your week changes
Missed a session? Slept badly? The plan re-optimises overnight, not at your next coach meeting.
See when you're digging into the well
Stack-up of training load, sleep, and HRV. We catch the red lights before they become injuries.
Run race day before race day
Project the conditions, the course, your taper. See three race-day scenarios so nothing on the start line is a surprise.
Inside the app
See it in action.
Five screens you'll actually use — some daily, some weekly, all working together.
Know if today is a green-light day.
A daily readiness score with three suggested workouts tuned to how recovered you are. Open it before your morning run.
See the kind of runner you actually are.
Archetype analysis from your training data — Speed Demon, Endurance Builder, and others. We train your gap, not your strength.
Compete worldwide across six categories.
Weekly rankings on distance, pace, endurance, heart rate, VO2 max, and cadence. Hold #1 to earn 24-hour shield protection.
Run the next 6 months before you train them.
Tweak volume, intensity, and consistency to project finish times. Powered by VDOT (Daniels) and Training Stress Score (Coggan) — the same models elite coaches use.
Know when you're digging into the well.
Heart rate variability with age-norm percentile, trend, and recovery readiness. Catch overtraining before it costs you a race.
How the prediction is computed
No black box. We combine six peer-reviewed models with your training context, then show you a confidence range — not false precision.
PaceBrain is built by a runner who actually races. The product I trained on is the product you get.
I use PaceBrain to train myself — to find my weaknesses and my strengths. It's helped me achieve many podiums and my 5K PB of 17:53. Highly recommend using PaceBrain to take your performance to the next level.
Simple, runner-friendly pricing
Predictor is free forever. Upgrade only if you want the loop.
- Race time predictor
- Strava sync
- Basic running stats
- Community leaderboard
After your free month. No card needed to start.
- Everything in Free
- AI training plan tuned to your gap
- Performance DNA + RunSignal + Recovery
- Race-day pacing for your specific course
- Adaptive plan that re-optimises weekly
Cancel anytime in the App Store. No retention games.
Honest answers
The questions we get most. We'd rather lose your money than waste it.
From the blog
Research, not bro-science.
Every article is grounded in peer-reviewed studies, with full citations. No marketing fluff.
Your finish time is sitting in your training data right now.
Find it in 30 seconds. Free, no signup. First month of Premium on us.
No credit card required · Cancel anytime in the App Store