marble app icon

“The fight is won or lost far away from witnesses.”

Muhammad Ali

“The harder the conflict, the more glorious the triumph.”

Thomas Paine

“Fire tries gold, misfortune tries brave men.”

Seneca

“Nothing great is produced suddenly.”

Epictetus

“The credit belongs to the man who is actually in the arena.”

Theodore Roosevelt

“Never give in.”

Winston Churchill

“To strive, to seek, to find, and not to yield.”

Alfred Tennyson

“Stiffen the sinews, summon up the blood.”

William Shakespeare

“Courage is resistance to fear, mastery of fear—not absence of fear.”

Mark Twain

“Try again. Fail again. Fail better.”

Samuel Beckett

The minimal workout journal for iPhone.

Download on the App Store Free · Offline · Private
Marble workout journal showing sample runs, planks, calf raises, and squats with matching emoji icons

Built for the work.

Three ideas, done carefully: fast logging, honest analysis, and consistency that survives real life.

Log

A set in seconds.

Weight, reps, RPE, rest — captured before the plates stop spinning. marble remembers your last set so repeating it is one tap, and a rest timer waits in the Dynamic Island.

  • Save + Next keeps you moving through a session.
  • Siri and the Action button log a set without opening the app.
  • Scan turns a handwritten page into logged sets, on-device.
Marble set logger for bench press with a weightlifting emoji, last-set recall, personal bests, and Save plus Next

Trends

Coached by your own numbers.

Every chart is computed from your logged sets, on your iPhone. No wearable scores, no black boxes — just an honest read on whether each lift is moving.

  • Estimated 1RM trends with a plain verdict: progressing, holding, or adapted.
  • A real PR feed — and a cue when a record is in reach today.
  • A monthly report with fair month-over-month comparisons, written privately on your phone.
Marble Trends showing a weekly goal, six-week streak, July training summary, and next-step guidance

Consistency

Streaks that forgive.

Set a weekly goal and build a streak that bends without breaking. Hit four weeks in a row and marble banks a flex week that absorbs a miss — comebacks are celebrated, not shamed.

  • Calendar shows every training day at a glance.
  • Weekly split maps your plan, Monday to Sunday.
  • One quiet reminder that cancels itself once you’ve trained.
Marble training calendar showing workout days, streaks, recovery, and progress at a glance

Meet marble 2.1.

Real screens, thoughtful sample workouts, and exercise-matched emoji icons — from focused sessions to private backups.

Marble workout journal showing Run, Plank, Calf Raises, and Squat entries with exercise-matched emoji icons
Journal
Marble Log Set screen for Bench Press showing the previous set, personal bests, weight input, and Save plus Next
Fast logging
A live Leg Day workout in Marble with Squat and Calf Raises entries using matching exercise emojis
Live workouts
Marble Trends showing a weekly goal, six-week streak, July training summary, and next-step guidance
Strength trends
Marble calendar showing a 35-day streak, eight sets, four exercises, and July training-day markers
Training calendar
Marble Exercise Library showing exercise-matched emoji icons for Bench Press, rows, cycling, calf raises, crunches, deadlifts, and more
Exercise icons
Marble sprint logging with a matching sprint emoji, four 100-meter repetitions, a pace range, and a rest goal
Sprint targets
Marble Data and Backups showing on-device totals plus portable export and restore controls
Private backup

And the details.

Apple Health

Imports Apple Watch and Garmin workouts automatically.

Training Load

Sends sessions back to Health with your effort score.

Supplements

Creatine, protein, and other habits — one tap each.

Muscle coverage

Weekly hard sets, measured against the 10–20 set guide.

Rep records

Your best weight at every rep count, per exercise.

Progression hints

When every set tops 8 reps at manageable effort, marble names the next load.

Light & dark

One quiet design, both moods.

Free

Every feature. No subscription, nothing to unlock.

No accounts. No ads. No tracking. Every set you log lives on your iPhone — and nowhere else.

Fully offline · On-device analysis · Nothing to sign up for

Questions.

Is marble free?

Yes. Every feature is free — there’s nothing to unlock.

Does marble work offline?

Yes. Everything is stored on your iPhone. No account, no server, no sync to anyone else’s cloud.

Where does the coaching come from?

From your own logged sets. Estimated 1RM trends, PR detection, and the monthly report are all computed on your device.

Does marble work with Apple Watch or Garmin?

Yes — both arrive through Apple Health. marble imports their workouts, and can send your strength sessions back with an effort score so they count toward Apple’s Training Load.

Does marble show ads or sell my data?

No ads, no tracking, no selling. marble is local-only.

Start the record.

Download on the App Store Free · iPhone · Offline