New · on-device AI form coach
HIITPrime is a full-body HIIT session that fits in a coffee break. Voice-coached warm-up, HIIT and cool-down — plus an AI form coach that counts your reps and corrects your form using your phone's camera. No equipment. No login. Works offline.
No credit card. Cancel anytime. Free forever tier available.
How it works
Designed for busy professionals: the fastest path from 'I have 15 minutes' to a sweat that actually counts.
Step 01
No signup. Pick your difficulty. Today's 15-minute session is already queued.
Step 02
Camera on. The AI sees your body and counts reps in real time — all on-device.
Step 03
Warm-up · HIIT rounds · Cool-down. Voice coach counts you in and calls form fixes.
AI coach · proven
MediaPipe pose landmarks run on-device at 15 fps. It counts reps, checks joint angles, flags depth and tempo, and stops the set if a critical joint goes out of safe range. No video ever leaves your phone.
Reps
14
Air squat · L2
Form
92%
Rep counting
Joint-angle state machine per movement archetype.
Form cues
Live voice: 'Deeper', 'Chest up', 'Slow the descent'.
Safety stop
Auto-pauses the set if knees, back or neck drift into risk.
100% on-device
Camera frames never touch a server. No account needed.
Workout library
A rotating program covering every movement pattern — push, pull, hinge, squat, core and cardio — with warm-up and cool-down included in every 15 minutes.
Fat-loss
12 min HIIT · full body
Legs · Core
Bodyweight lower + core
Upper
Chest, shoulders, triceps
Upper
Back + biceps · isometric
Recovery
Hips, T-spine, hamstrings
Cardio
Cardio finisher · 8 rounds
Stay committed
HIITPrime is built on the behavioral mechanics that actually work — friction removed, streaks visible, decisions eliminated.
Streaks
Miss a day, the ring breaks. Simple, unforgiving, effective.
Same time daily
Optional gentle reminder at your chosen slot.
One decision
Today's session is already picked. Press start.
Under 15 minutes
The whole app is engineered against your excuses.
App preview
Large type, thumb-sized controls, no menus during the workout. Screen stays awake. Voice coach handles the rest.
Round 4 / 6 · Work
Squat jumps
Explode up · soft landing
28
seconds
14
reps
92%
form
Next
rest 10s
Milestone badges
Every meaningful streak unlocks a badge. Nothing to grind, nothing to buy — just proof you showed up.
3
First streak
7
One week
14
Habit forming
30
One month
60
Two months
100
Century
Why HIITPrime works
Time-efficient
Meta-analyses show short-interval HIIT delivers comparable VO₂max gains to sessions 3× longer.
Full-body
Every session covers push, pull, hinge, squat and core so nothing is neglected.
Progressive
L1 → L3 progressions per movement means the workout scales with you, not past you.
Behavior-designed
One decision, one CTA, one streak. Friction is engineered out.
What early users say
These quotes are placeholders drawn from private beta feedback themes. We'll replace them with attributed reviews at public launch.
“Finally a workout I actually finish. It's over before my excuses show up.”
“The camera counts my reps. That alone made me stop skipping the last round.”
“15 minutes at 6:45am. Streak of 41 days. I don't even think about it anymore.”
Pricing
Start free. If HIITPrime doesn't stick within two weeks, you pay nothing.
Free forever
$0
One workout a day. No card.
Pro
$6/mo
Or $49/year · 14-day free trial
Frequently asked
If we missed one, email hello@hiitprime.app.
No. Every session is bodyweight-only and works in a 2m × 2m space.
No. HIITPrime works entirely on your device. An optional Pro account unlocks the AI form coach and history sync.
Never. Pose estimation runs on-device using MediaPipe. Frames are analyzed locally and immediately discarded.
Yes. HIITPrime is an installable PWA. After the first load, workouts run without a network connection.
For most goals — general fitness, fat loss, VO₂max — yes, when the intensity is honest. HIITPrime keeps you honest.
Yes. One tap, no email chase, no dark patterns.
The excuse-proof workout
No card. No login. Works offline.