Race yourself.
SplitLab gives you deep run analytics computed entirely on your iPhone using Apple Health data.
Home Loop
91 runs · 5.0 km · auto-grouped
New 5K Personal Record
22:14 · −0:18 vs. previous best
No Account
Open the app and go. No sign-up, no email, no password.
No Servers
All analytics run on your device. Your data never leaves your iPhone.
No Tracking
Zero ads, zero analytics SDKs, zero third-party data sharing.
Real AI insights. Zero cloud.
SplitLab runs Apple's third-generation on-device Foundation Models — the same on-device AI behind Apple Intelligence — directly on your iPhone's Neural Engine. Every insight, correlation, and record detection is generated locally. Nothing is ever sent to a server.
Everything a runner needs
Six powerful analytics features — all free, all private, all on your device.
Same-Route Comparison
Detects routes you run repeatedly and lets you race your past self. Time-gap charts show exactly where you gained or lost seconds.
Personal Records
Automatically finds your best efforts from 400 m to half marathon by scanning your GPS and time streams.
Apple Health Blend
Correlates each run with your sleep, resting heart rate, HRV, and VO₂max — then explains it in plain language.
Relative Effort & HR Zones
Free TRIMP-style effort scoring and heart-rate-zone breakdown for every run, no subscription required.
Gear Tracking
Log your running shoes and watch mileage accumulate automatically. Get a nudge when it's time to replace them.
Weekly Goals
Set distance targets and track progress with visual indicators and a celebration when you hit your goal.
Set up in under a minute
No account creation, no forms, no onboarding funnel.
Install SplitLab
Download from the App Store — no sign-up screen to click through.
Grant Health access
One native iOS prompt. SplitLab reads your existing workout data.
See your insights
Personal records, HR zones, and route comparisons appear instantly.
Your data stays with you
SplitLab has no user accounts and no backend servers. Your health and location data is used only on your device to power your analytics.
Read the Privacy Policy →Your best runs, quantified on your device.
No cloud account. Free forever. Just your data, on your phone.
Coming soon to the App Store