How accurate is the projection?

PIRX delivers the most accurate race-time projection on the market — built and validated by Olympians. Every projection ships with a supported range so you can see the confidence bounds. The range widens when data is sparse and tightens as your training history grows.

What devices does PIRX work with?

PIRX supports Garmin, COROS, Polar, Apple Watch, Suunto, WHOOP, Oura, Fitbit, and any platform that syncs through Strava, Apple Health, or Google Fit. If you wear it, we can read it.

What happens if I cancel?

Cancel anytime in two clicks. Your subscription stops at the end of the billing period and your data stays safely with you — export it any time. No penalties, no questions asked.

Only you can see your data. PIRX uses secure authentication, encrypted wearable connections, and row-level security policies in the database — meaning even at the storage layer, each user can only access their own rows.

What are the five drivers?

Aerobic Base, Threshold, Speed, Economy, and Consistency. Each is scored 0–100 and broken down to the second so you know exactly how every part of your training contributes to your projected time.

Does PIRX get smarter about me over time?

Yes. As your data grows, PIRX trains a personal model on your unique patterns. Before promoting any model, it runs an accuracy test — only models that outperform the generic rules go live.

Yes. PIRX has a built-in chat where you can ask questions in plain English. The agent has 16 specialized tools to look up your real data and only gives advice it can cite with your actual numbers.

What will PIRX never do?

PIRX will never make up advice, push you toward danger, fake confidence, share your data, or guess when data is missing. If it doesn't have enough information, it tells you so.

Try PIRX risk-free — 30-day money-back guarantee·Sign Up →

PIRX

Female track runner sprinting on an outdoor track

Performance Intelligence Rx

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.

Verified against real races — 97.4% accurate, median miss just 7 seconds

Try the free race predictor

Free · No sign-up · Instant result

Get the app

Available Soon

Available Soon

Most accurate modelon the market

See the proof →

180k+

Projectionsdelivered

4.9 / 5.0

Beta testerrating

10+

Wearablessupported

Available onGARMINCOROSPOLARAPPLE WATCHSUUNTOWHOOPOURASTRAVA

Ambassadors

Backed by Canada's next generation of runners.

National team athletes and record holders training with PIRX every day.

Brody Clark

Middle-distance · Cross country · Milton, ON

Maya Markowska

Middle-distance · Burlington TFC

Riley Innes

Distance · Newmarket Huskies TC

Free tool · No signup · No wearable

Try the race
predictor.

Curious before you connect a watch? Enter one recent race result and get an instant projected finish time — plus the performance drivers behind it. No account, no hardware, no catch.

Predict my race time →

Jump to your distance

5K 10K Half Marathon Marathon

Example · 10K → Marathon

Recent 10K45:00

Projected marathon

3:28:10

Supported range 3:24:30 – 3:33:40 · 4:56 /km

Aerobic base82

Pace economy71

Speed reserve64

Illustrative example. Your projection uses your own race result.

Partners

Trusted by the organizations building Canadian distance running.

We partner with federations, clubs and brands committed to helping runners train smarter.

Interested in partnering with PIRX? Get in touch.

The Problem

Hard work.
Zero answers.

Months

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.

01Wastes mileage on the wrong workouts

02Hits the same personal best ceiling every season

03Trains hard with nothing to show

04Has no idea what's actually working

05Keeps getting injured mid-block

06Doubts the plan at the start line

Don't let your hard work
go to waste.

Start your 14 day free trial

How 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.”
— PIRX Beta Tester · Sub-3 marathoner

PIRX run analytics on iPhone — heart-rate trace, zone breakdown, driver attribution, and a 4:39 → 4:31 1500m projection

PIRX driver breakdown shown across two iPhone screens

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.

“I've enjoyed seeing the different training metrics, especially the breakdown of my running zones and how my training is being analyzed.”
— Maya Markowska · Ontario 800m Record Holder

Garmin Fēnix watch on a runner's wrist with a red track in the background

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.”
— PIRX Beta Tester

PIRX · 3 min ago

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.

Drivers · baseConfidence ±5s

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.”
— PIRX Beta Tester

Peak for race 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.

“It is great for giving athletes more insight into their fitness levels, as well as improving athlete's confidence before competing in an event.”
— Brody Clark · Canadian U18 3000m Record Holder

Start your 14 day free trial

Race-day readinessScored 0–100, every day

Intelligent training