Log the set
Load, reps, and RIR in half steps, as fast as a notes app. Partials are marked. Bodyweight work starts at your bodyweight, so the math stays honest.
Hypertrophy tracker · iOS · launching soon· on the App Store
Track the
Track the
stimulus.
Not just the sets.
Your logbook counts sets. Stimuli measures the stimulus behind them. Every set is scored with Effective Work as you log it. You see which muscles got a growth signal this week, and which are recovered for the next one.
299Exercises, all calibrated
0.5RIR precision
1 tapFull CSV export
Designed around published hypertrophy research
Volume · Proximity to failure · Recovery
The method
Two lifters do 20 sets of chest. One grows.
Set counts treat every set the same. RIR 3 and RIR 0 are not the same set, a partial is not a full range rep, and an incline press is not a fly. Stimuli is the hypertrophy tracker that scores the difference.
Score the stimulus
Each set is scored by per-exercise muscle coefficients, proximity to failure, and range of motion. The result is one number per set: Effective Work.
Watch it land
Effective Work rolls up per muscle, per week, against your targets. The figure shows what got stimulated and what has recovered. You see whether training is working.
The instrument
Reads like a gauge. Not a diary.
Per muscle, per week
Recovery and stimulus, on the figure
The anatomy figure shows how stimulated and how recovered each muscle is, computed from your actual sets. Not how strong you are, and not a sleep score.
Logging
Precision without friction
RIR in half steps. Partials counted at partial credit. PRs detected the moment you log the set, per exercise and per machine.
Progress
e1RM trends that call the shots
Every set updates an estimated 1RM, and trends drive the next-set suggestions. The rule is strict: plateaus do not justify deloads. A sustained two week decline does.
Programs
Tell it what you want to grow
Tap the muscles you are prioritizing and Stimuli builds a complete program around them, in about 30 seconds. Edit anything by hand. Manual and generated programs live in the same library.
299 exercisesVideo and written cues for every single one. Cues are built in, videos stay offline once viewed.
Machine profilesStack numbers differ per machine, so history and PRs resolve per machine.
Your data, portableFull CSV export in one tap. Account deletion lives in the app.
kg and lb, 13 languagesWorks how and where you train.
Pricing
Priced like a coach. Not a notepad.
Stimuli plans your training and scores every set. That is coaching work, and it is a fraction of what one session with a coach costs.
Stimuli Pro
$79.99/ year
That is $6.67 a month, billed yearly. Or $9.99 month to month.
- Free trial for new subscribers, monthly or yearly
- Everything included. One tier, no add-ons
- Cancel anytime in the App Store
Paid app. No free tier. The trial is the free part. If it does not earn a place in your training, cancel and take your data with you.
Prices in USD · Billed through the App Store · The waitlist is free
FAQ
Straight answers
What is Effective Work?
A per-set score of muscle-growth stimulus. Each set is scored using load, per-exercise muscle coefficients, proximity to failure, and range of motion, then rolled up per muscle, per week. It is the number your training volume was always trying to be.
Can I see the math?
Yes. A set's Effective Work is the exercise's per-muscle coefficients scaled by your load relative to your estimated 1RM, by how close you took the set to failure in half-RIR steps, and by range of motion, with partials counted at partial credit. The same math runs on every set, and your CSV export carries the inputs, so you can recompute any score yourself.
Is Stimuli free?
No. Stimuli is a paid app with a free trial for new subscribers. Stimuli Pro is $9.99 a month or $79.99 a year in USD, billed through the App Store. The price filters for people who train seriously, and it keeps ads and data-selling permanently off the table.
When does it launch?
The iOS app is built and in final App Store preparation. Waitlist members get one email the day it goes live. Android follows later.
Is my data locked in?
No. Your full set history exports to CSV in one tap, including load, reps, RIR, range of motion, and machine. Account deletion lives inside the app.
Does Stimuli track me?
No ad pixels, ever. The app and this site use anonymous product analytics that are not tied to your name, email, or account, and your training data is never used for advertising.
Launching on iOS soonLive on the App Store
Get it on day one.Train with intent.
One email when Stimuli hits the App Store. Nothing else.
Free trial for new subscribers. Your first set scores tonight.