Choose your run.
Choose Pace me for a target pace, Just record for an unstructured run, or a saved workout. Check live heart rate and GPS accuracy before you set off.
Pace me · Just record · WorkoutsCOMING SOON · FOR IPHONE · BY STRATAIC
Run your session.
Hear what matters.
Your pace, your plan, your music. Spoken guidance that you control, and a clearer view of what your running is doing for you.
Built for running with your iPhone and headphones.
Add a Bluetooth monitor for heart-rate coaching.
Running
Steady effort2 / 4
Target 138–142 bpm06:20 left
Heart rate140bpm✓ In target
Current pace6:24/km
Time18:40
Distance2.92km
“Heart rate 140.
Right on target.”
Ⅱ PauseFinish
Illustrative session · example readings
On-device voiceYour music keeps playingLocal run historyOptional Apple Health
A RUN, FROM START TO FINISH
Less fiddling.
More running.
Go straight out, follow a session, or repeat a fitness test. Keep the essentials close and the detail ready when you need it.
Listen, your way.
Follow pace or heart-rate targets. Choose what is spoken and how often. Stage instructions take priority, while short cues briefly lower your music.
Voice · volume · individual timersKeep the whole story.
Review charts and splits, save a route for next time, or repeat a workout and compare it with earlier attempts. Add effort, a feeling, notes or a photo to keep the numbers in context.
Your numbers + how it feltA FAMILIAR WAY TO GO
Save it once.
Run it again.
Keep favourite routes in your library and choose one for another run, workout or fitness test. Give it a name once, then rename or archive it when you need to.
For a fitness test, reuse your saved loop and targets, then confirm the direction and conditions. You can also record a test without saving a route; it stays in your history, outside the comparable trend.
How saved routes workRoutes help you organise and compare runs. They do not provide turn-by-turn directions.
COACHING WITH AN OFF SWITCH
The right words.
At the right time.
Some runs need a little direction. Others need space. Start with a simple preset, then adjust each report independently.
See the voice controlsEXPLORE A SAMPLE SETUP
Current pace & heart rateEvery minute
Target correctionsOn
Upcoming stage30 seconds before
Distance milestonesEvery km / mile
An illustration of app presets. No audio plays on this page.
REPEATABLE FITNESS TESTS
The same loop↻
The same targets♥
A measured change↗
Concept diagram · your results depend on your recordings.
PROGRESS WITH CONTEXT
Same effort.
A clearer comparison.
Repeat two steady heart-rate efforts on a familiar loop. Compare the pace you sustain at each target, with settling time and recording quality accounted for.
Six comparable days across at least two weeks support a trend. Missing signals and mismatched tests stay outside that comparison.
A field estimate, not a lab test, diagnosis or VO₂max prediction. Repeatability still needs validation in real-world use.
FITS INTO YOUR RUNNING
Clear connections.
No hidden handoffs.
Apple Health
Save a workout copy and, with separate permission, read your running history.
OptionalBluetooth monitors
Use a standard Bluetooth heart-rate chest strap or arm band. Live readings drive coaching.
Live heart rateStrava
Save a FIT file, upload it on Strava, then add your title, description and photo there.
Manual exportSiri & music
Ask to pause, resume, hear status or move to the next interval. Guidance mixes with your music.
Your iPhoneAn iPhone app. There is no companion Apple Watch app or automatic Strava account sync in this version.
QUESTIONS
Who designed Fitness Curve,
and how was it built?
Fitness Curve is designed by Strataic and built with AI support. We shape the features and experience, direct implementation, and work through testing and refinement. AI tools help produce and revise code, content and illustrations. Read about the design process and credits.
BUILT BY STRATAIC
Your running deserves
a little more clarity.
Have a question, an idea, or feedback from a run? We would like to hear it.
Get in touch