For lifters
Log the set. Watch the number move.
A workout tracker for people who want to know what they lifted last time. Build the session, log every set against your targets, and watch the graph climb. Free to start, in any browser, and no card.
- Exercises, with instructions and video
- 193
- Programmes, imported in one tap
- 26
- To start, and no card
- £0
Build the session in a couple of minutes
A plan is your exercises and your target sets. The builder keeps it that simple and does the arithmetic for you.
Type it, don’t dig for it
Start typing a movement and it appears, bringing its instructions and equipment with it. There is a browsable picker for when you would rather look than type.
Supersets and circuits
Link two exercises and they run back to back with no rest between them. Rest comes back once the group is done, which is how a circuit is meant to work.
Barbell, treadmill or clock
Lifting is reps and weight, a row is a duration, a run is distance and time. Each kind of work is logged in the units it actually uses.
Know what it costs you
The time estimate updates as you add sets, so you find out whether the session fits the hour you have before you leave the house.
Folders hold a block together
Group a training block, and move plans in and out of it. Delete a folder and the plans inside are kept — they just go back to Unsorted.
Copy rather than rebuild
Duplicate a plan and change the copy. A variation you try on Tuesday never rewrites the original.
A library you didn’t have to write
193 exercises and 26 programmes, included from your first session.
Every movement, explained
193 exercises across push, pull, legs, core, cardio and mobility.
- The equipment each one needs
- Numbered steps, written to be followed mid-set
- A demo video for every entry
Search the way you think
By name, by the muscle you are training, or by the one machine that happens to be free. Entries open where they sit instead of throwing you to another screen.
Programmes worth following
26 programmes for building muscle, losing weight and getting fitter — each one telling you the days a week, the session length and the kit before you commit.
Importing makes it yours
Every day of a programme lands in your own plans, in a folder named after it. Change anything you like: it is your copy, and nothing overwrites it later.
The screen you hold with a barbell in front of you
Big targets, one thumb, and nothing that punishes you for a bad signal.
Your targets, behind the numbers
Planned reps and weight sit in the fields as a prompt. You log what actually happened, and the plan stays exactly as you wrote it.
A warm-up never claims a record
Tap the set number to mark it as a warm-up, a drop set or one taken to failure. Only real working sets can become a personal best.
Rest starts itself
Tick a set and the timer runs. Add thirty seconds, skip it, or leave it — the end is beeped, shown on screen and announced out loud, so sound is never the only signal.
A dropped phone costs you nothing
The session is saved to your device as you go. Lose signal in the basement, refresh by accident, close the tab — it is all still there when you come back.
Someone is on the rack
Swap the exercise mid-session or move it further down the order. The sets you have already done stay attached to the exercise you did them on.
Chalk-proof
The screen stays awake for the whole session, so there is no locked phone to prod between sets.
The part that keeps you coming back
Every chart is drawn from sets you logged. Nothing is averaged from other people, and nothing is filled in for you.
Strength, on a line
An estimated one-rep max for any lift, over a month, six, a year or all of it. Each session contributes its best working set, because a chart of your warm-ups is not progress.
Personal bests find themselves
A record is spotted the moment you log it and marked with a medal and the letters PB. There is nothing to file and nothing to remember.
The weeks you trained, and the ones you didn’t
Six months of consistency at a glance, with the blank weeks drawn rather than skipped. Tap any week to open the session.
One session, in full
Every exercise, every set, and the totals for time, sets and tonnage — including anything you swapped, with what you did instead.
Bodyweight beside the lifting
Weight and measurements from your check-ins are charted next to the strength work, so you can see what the training is doing to both.
Goals that keep themselves
A goal you have to update by hand is a goal you abandon by February.
Nothing to tick off
There is no "current value" box anywhere in the app. Goals read from the sessions and check-ins you are already recording, and move the moment you save one.
Five kinds of goal
Set the one that matches what you are actually chasing.
- Strength — an estimated one-rep max on a lift
- Volume — tonnage over a rolling week
- Consistency — sessions a week, averaged over a month
- Endurance — a distance or a time on a logged run
- Body composition — weight or a measurement from your check-ins
Where you started counts
Your starting figure is captured when you set the goal. Without it, 80 kg on the way to 100 reads the same whether you began at 30 kg or at 95.
Down is progress too
Getting to 80 kg from 90 is measured the same way as adding 20 kg to a squat. A weight-loss goal never reads 106 per cent.
A missed date is not a deleted goal
The date passes, the goal is marked missed, and it stays on the screen. Give it a new date in one tap — things retire here, they do not vanish.
Goals your coach sets
If you are coached, their targets sit alongside your own and say who set them. You cannot delete one, but you can flag it as no longer relevant, which tells your coach rather than quietly removing it.
Photos and check-ins, on your schedule
Kept on whatever rhythm you actually keep, not the one a form insists on.
Only the date is required
Weight, measurements, notes and photos are each optional. A form that demands a weight is one people skip on exactly the days the trend matters most.
Front, side, back
Several photos per angle, a cover shot in the list, and a swipeable gallery when you open one.
Every figure on its own clock
Weigh in weekly and measure your waist monthly, and the waist change still reads against the last time you measured it rather than against a blank.
Your photos stay yours
Sharing a check-in with a coach is a switch on that one check-in, and it starts off. Measurements go to a linked coach; photos do not, unless you say so.
Delete means delete
Removing a check-in removes its photos with it, rather than leaving the files somewhere you cannot see.
Wherever you train
One account, one login, and no app store standing between you and a set.
Every device you use
Plan on the laptop, train from the phone, review on the tablet. Your plans, folders, sessions, check-ins and photos are the same everywhere you sign in.
Add it to your home screen
It installs from the browser and opens in its own window, like any other app on the phone — without an app store, an update queue or a gigabyte of storage.
Told, not chased
Every kind of notification has its own switch, and you turn them on one at a time.
- A message from your coach
- A new plan landing in your app
- A booking confirmed, declined or coming up
- A goal reaching its target
- A personal best, with the old figure beside the new one
- A nudge after a week without a session — only if you want it
Made to be used by everyone
Colour contrast, keyboard operation and reduced motion are tested on every release, and the accessibility statement sets out plainly what has been checked and what has not.
Before you start
Common questions
Yes. The free tier gives you unlimited plans and folders, the whole exercise library, live session logging with the rest timer, and personal-best detection — with no card at signup and none later. Individual Pro adds the programme library, the progress charts, goals and check-ins, and runs 14 days before the first charge.
No. RepStax runs in any modern browser on a phone, a tablet or a laptop, and the phone-width layout is the one designed for the gym floor. If you want it to feel like an app, you can add it to your home screen from the browser and it opens in its own window.
A session in progress is saved to your device as you log each set, so a dead spot in the basement, a refresh or a crash will not cost you a set. It syncs as soon as you reconnect, and the app tells you where the sync has got to rather than leaving you guessing.
Either. There are 26 programmes covering muscle building, weight loss and general fitness, and importing one copies every session into your own plans so you can change anything you like. Building from scratch takes a couple of minutes, and you can mix the two.
Reps and weight for lifting, duration for machine and bodyweight work, distance and time for runs. On top of that: estimated one-rep max over time, weekly tonnage, training consistency, personal bests, bodyweight, body measurements and progress photos.
It gets you more, for less. A client linked to a coach on RepStax gets the whole Individual Pro feature set free for as long as you work together, and if you later go it alone you keep a reduced rate of £2.99 a month.
Nothing is deleted. The screens for the tier you have left lock, and every plan, logged set, personal best and check-in behind them stays exactly as you left it. Your free account carries on working, and everything unlocks again if you come back.
Start with the free tier
No card, no trial clock, and nothing to cancel. Add Pro when the charts and the programmes are worth it to you.