Your
training
has a
number.
Connect your watch. PIRX delivers the most accurate race-time projection on the market, then tells you which seconds came from where. Built by Olympians. Works with the watch you already own.
14-day money-back guarantee · No credit card required
Get the app
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Hard work.
Zero answers.
Average time wasted before a runner figures out a training block isn't working.
Other platforms tell you how recovered you are. PIRX tells you what you're capable of.
Don't let your hard work
go to waste.
Start getting fasterHow it works
Four steps to your
fastest race ever.
Connect yourwatch
Garmin, COROS, Polar, Apple Watch, Suunto, WHOOP, Oura link in 30 seconds. No new hardware.
Get yournumber
PIRX analyzes your training history and delivers the most accurate race-time projection on the market.
See where itcomes from
Five performance drivers, scored 0–100, broken down to the second. No guessing.
Train withconfidence
Adaptive plan, race-day readiness, and injury risk alerts, every day, on your wrist.
Your number
Just sync your
watch. We'll handle
the rest.
The most accurate race-time projection on the market
PIRX analyzes your training history and builds a projection that updates every day. No spreadsheets. No guessing. One number that tells you exactly where you stand.
“The first tool that actually told me what my training was worth.”
Five drivers
Know which
seconds came from
where.
Effective, science-backed breakdown
Aerobic Base. Threshold. Speed. Economy. Consistency. Five drivers, each scored 0–100 and broken down to the second. So you stop guessing what's working, and start training the right thing.
“The driver breakdown changed how I plan every block.”
Works with your watch
No new hardware.
No friction.
Garmin · COROS · Polar · Apple · Suunto · WHOOP · Oura
Connect in 30 seconds. PIRX pulls from every wearable you wear and every app you sync — Strava, Apple Health, Google Fit. One number, all your data.
“Linked my Garmin in under a minute. Had a projection before my coffee finished.”
Your last three threshold sessions came in 4% above target HR. You're projecting 3:14:23, but your aerobic base is the lever — adding one easy 90-min run this week pulls projection toward 3:13:11.
Personalized insights
Smarter feedback.
Better results.
Every insight cites your real numbers
PIRX never makes things up. Every recommendation pulls from your projections, drivers, readiness and injury risk, and tells you exactly where the advice came from.
“Closest I've had to a coach checking in with me every day.”
Train withconfidence.Perform atyour peak.
Base. Build. Peak. PIRX guides you through each phase with a daily readiness score and pace-driven workouts — so you arrive at the start line knowing exactly what you're capable of.
“I dropped 22 seconds off my 5K pace and I'm feeling better than ever.”
Intelligent training
A plan that adapts
to your life.
Simple, honest pricing
One engine. Two ways to pay.
Save over 50% with annual. Cancel anytime — your data stays yours.
Try it month-to-month. No long commitment.
Billed monthly · Cancel anytime
- 14-day free trial
- All 12 intelligence modules
- Full driver breakdown, in seconds
- Race-day readiness scoring
- Injury risk early warning
- Physiology & intervention log
- All wearable integrations
Got questions?
Everything you need to know.
Start training, get faster
Your training
has a number.
Try risk-free for 14 days. Watch your fitness, and your projection, improve.
Start getting faster →14-day money-back guarantee · No credit card required