Log a set. Know the next one.

Gymmit is a gym log with a coach built in. After every set it tells you to go heavier, hold or ease off, and shows the rule behind it. Rules you can read, switch off and change.

Ask for a beta invite iPhone · free during the beta

A workout in the app: two sets of bench press logged, the second with four reps left, and the coach’s banner offering 80 kg for the next set — Bench press, set 2: eight reps with four left, on a plan of two. The rest timer has only just started and the coach’s answer is there: 80 kg for set 3.

The same set, answered four ways · cut from the app’s own screen

4 reps left when you planned 2

Tap Why and it shows its working. The rule: “Heavier next set when RIR is well above target”. RIR is reps left.
1 rep left

The rule: “Lighter next set when RIR is below target”.
0 reps left with a set still to go

The rule: “Failure only on the final set, at most 2”.
2 reps left as planned

Nothing. A set that goes to plan gets no banner.

The coach · 21 rules in seven groups

Every suggestion comes from a rule you can read.

The coach is a set of rules that run on your phone. It answers before you have put the bar down, works with no signal in the basement gym, and never surprises you: every suggestion says which rule made it.

The Rules screen: the Weight and reps group open, five rules each with a switch, and six more groups below — Every rule has a name, a sentence that says what it does, and a switch.

One rule’s page: Heavier next set when RIR is well above target, why it matters, an example, its switch and its three numbers — Open one for why it matters, an example, and its numbers. Change them and the coach follows from the next set.

The New rule screen: failure sets, set limit, variations per session, exercise order, load cap, left and right order — Or write your own from six kinds: a set limit, a load cap, which side goes first.

Switch any rule off.

Disagree with the coach about failure sets? Turn that rule off, or change its numbers. Nothing is hidden and nothing is locked.

Write your own.

“Keep squats at or under 100 kg for three workouts.” Rules you add sit beside the built-in ones and work the same way.

Quiet by default.

A set that went to plan gets no banner. The coach speaks when something should change, and you choose how much it says.

After the workout

Next time is already planned.

When you finish, the coach sets the starting weights for your next workout. If you want it in words, ask for a written review.

Next time, as numbers.

Here two first sets had reps to spare, so incline press goes from 28 to 30 kg and bench press from 77.5 to 80 kg. The rest stays where it is, and your next workout opens with these already filled in.

The same, in words.

The AI review reads the workout’s numbers and explains them: how it went, where you tired, what changed across workouts and why the coach planned what it did.

Optional, and the only part of Gymmit that uses AI. Off until you turn it on; it reads the workout’s numbers, not your name or email. Nothing it suggests changes your plan until you accept it.

A finished workout’s page: Push, 53 minutes, 15 sets, 4,813 kg, and the coach’s Next time card with incline bench press 28 to 30 kg and bench press 77.5 to 80 kg — The workout’s page, with the coach’s “Next time”.

The AI review card on the same page: How it went, Performance and fatigue, Across workouts, and Next time, explained, each marked AI-generated suggestion with thumbs up and down — Further down the same page: the written review. The wording here is a sample.

Side by side

Gymmit next to Strong and Hevy.

Both are good gym logs, and both do things Gymmit doesn’t. What Gymmit adds is the coach: an answer after every set, from rules you can read and change.

What	Gymmit	Strong	Hevy
The coach
Tells you what to change for the next set, while you train	Yes, with the rule behind it	Not listed	Not listed
Works out the weights for your next workout	Yes	Not listed	Yes, with Hevy Trainer (Pro)
Rules you can switch off, change or write yourself	Yes, 21 built in	Not listed	Not listed
Rate how hard a set was	Reps left	RPE	RPE
A written review of the workout	Optional AI review, in the app	Not listed	Outside the app, through Hevy’s ChatGPT app
Your history
Bring your history from another app	From Strong and Hevy	Not listed	From Strong
Take your data out	CSV and JSON	CSV	Yes
Where they’re ahead
Apple Watch app	No	Yes	Yes, and Wear OS
Android	No, iPhone only	Yes	Yes
Use it in a web browser	No	Not listed	Yes
Follow friends, likes and comments	No	Share workouts and templates	Yes
Exercise library	347 lifts, each animated	Animated videos, number not given	400+ with videos
The same in all three
Rest timer on the Lock Screen	Yes	Yes	Yes
Home Screen widgets	Yes	Yes	Yes
Price
What’s free	Everything, during the beta	Logging with 3 routines; more with PRO	Logging with 4 routines; more with Pro

Checked on 12 November 2026 against each app’s own website, help pages and App Store listing (strong.app, hevyapp.com). “Not listed” means we couldn’t find it there; it doesn’t mean we tested the app and found it missing. Seen something wrong or out of date? Write to hello@gymmitapp.com and we’ll correct it. Strong and Hevy are trademarks of their owners; Gymmit isn’t affiliated with either.

Switching

Bring every set you have ever logged.

Export your history from Strong or Hevy and open the file in Gymmit. The coach starts from years of your training, so its first suggestion already knows what you lift.

Names it doesn’t know are settled one at a time: it shows the closest lifts in its library, and you tap the right one, make a new lift from the name, or leave it out.

The Import screen reading a Hevy export: 412 workouts, 6,695 sets, 20 of 22 exercises matched, and the closest library lifts for the name Face Pull — A made-up Hevy export of two years: 412 workouts read, 20 of 22 exercise names matched by themselves.

The rest of the app

A full gym log around the coach.

Straight from the app, light or dark to match your phone. Every screen on this page shows a made-up lifter’s data.

The Today screen with the next workout and the week — Today: what’s next and how the week is going.

The calendar of past workouts — Every workout on a calendar, coloured by what it trained.

The bench press page with its figure and recent sets — Each lift: how it moves, your best set and your last workouts.

The bodyweight chart — Body weight, typed in or read from Apple Health.

Outside the app

Run the workout from your Lock Screen.

The rest timer sits on the Lock Screen and in the Dynamic Island. When the rest is over it says Go, and the next set is logged right there: tap how many reps you had left and the next rest starts.

The Lock Screen card while resting: bench press, rest 1:46, plus 15 seconds and Skip, and the next set — Resting: the countdown, +15 s and Skip.

The card when the rest is over: Go, set 3, 80 kg for 8, and six keys for reps left — Rest over: log the set without unlocking.

The card before a timed set: plank, set 1, one minute, and a Start button — A timed set, like a plank: start its timer from here.

Your week, on your Home Screen.

The This week widget shows what’s done, what’s next and your sets per muscle, in three sizes. Start is one tap.

Spec sheet

What’s in the app.

Lifts	347 in the libraryEach with a how-to figure and the muscles it trains. Add your own.
Gyms	As many as you train atEach gym keeps its own equipment, so the cable that runs heavy at one place doesn’t skew your numbers at another.
Sides	Left and right, logged separatelyFor one-side-at-a-time lifts, with a nudge when one side keeps lagging.
Rest timer	Starts when you log a setOn the Lock Screen and in the Dynamic Island, with a tone when it runs out.
Plans	A week built around your daysPick how often you train; Gymmit lays out routines and tracks sets per muscle.
Apple Health	Body weight in, workouts outBoth optional, both off until you turn them on.
Your data	On your phoneOptional backup is stored in the EU. No ads, no tracking, no analytics.
Price	Free during the beta

Your next set is waiting.

Gymmit is in beta on iPhone through TestFlight. Ask for an invite and you’ll get the link by email.

Ask for a beta invite