Splitsmith: Race Predictor

Paper Plane Labs

In-app purchases

About this app

Splitsmith turns your training numbers into a complete race-day strategy for hybrid fitness races — eight 1 km runs interleaved with eight functional stations.

Enter your fresh station bests and run pace once. Splitsmith adds realistic race fatigue and station carryover for you, then projects your finish time, every segment split, and where you'd land in your division and age group.

Everything runs on your device. No account. No sign-up. Your data never leaves your phone.

FREE
• Projected finish time with an honest uncertainty range
• Full segment splits — every run, station, and transition (Roxzone)
• Field-position estimate for your division and age group
• Save one setup scenario

SPLITSMITH PRO
• What-if simulator — change a pace or a station best and instantly see the finish-time impact, with A/B compare
• Division benchmark radar — see your strengths and the areas worth working on versus athletes who finish where you do
• Race-day plan — your biggest time-saving opportunity, made concrete
• Session logging + forecast — track finishes over time and forecast your next race with a damped, honest trend
• Unlimited saved scenarios

BUILT FOR HYROX-STYLE RACING
SkiErg, Sled Push, Sled Pull, Burpee Broad Jumps, Row, Farmers Carry, Sandbag Lunges, and Wall Balls — modeled per station, with the Roxzone transitions included.

PRIVACY FIRST
Splitsmith has no servers and no accounts. Your inputs, sessions, and scenarios stay in on-device storage. The only thing that ever leaves your phone is a purchase, handled securely by Google Play.

Estimates only — not medical or coaching advice.