fettle/ˈfɛt(ə)l/ · noun — the condition or state you’re in; readiness of body and health.Peak Fettle: actualizing your potential.
A workout tracker for iPhone. Log your sets, see your estimated one-rep max, and see where you rank on 51 lifts.
+23.5 kg since wk 1
Example data: one lifter’s estimated 1RM on the bench press, week by week.
What Peak Fettle does
Log a set in a few taps. Peak Fettle works out your estimated one-rep max from every working set, ranks you on 51 lifts against published strength standards, and keeps a streak that is counted in weeks, not days.
- Fast set logging
- Supersets, drop sets, warm-ups, RIR or RPE and a rest timer. Cardio goes in the same log.
- An estimated 1RM from every set
- Worked out with the Epley formula from your working sets, so you never have to test a max.
- Percentiles on 51 lifts
- Calibrated to published strength standards and adjusted for sex, bodyweight, age and years trained. Worked out on your phone.
- Strength tiers
- Nine tiers, set by where your squat, bench press and deadlift rank.
- Weekly streaks
- A week counts when you log one session, a rest day or cardio. The week you are in never counts against you until it is over.
- Groups
- Train with 2 to 12 people towards a shared weekly goal and keep a streak together. You choose how much members can see.
- Routines and plans
- Start from Push/Pull/Legs or Upper/Lower, or generate a plan on your phone from your schedule and equipment.
- Exact weights
- Type 82.5 kg and 82.5 kg is what is stored. Kilos or pounds, with a plate calculator.
- Widgets and Live Activity
- A Live Activity rest timer with +15 s and Skip, Home and Lock Screen widgets, and Siri shortcuts.
- Apple Health
- Reads sleep, resting heart rate, HRV, steps and bodyweight, and writes your finished workouts back.
- Import from Strong and Hevy
- Import your workouts from Strong or Hevy in one step.
- Exercise detail
- Record grip, attachment, stance, bench angle or pulley ratio when it matters to you.
On the free plan your workout log is stored on your iPhone and works offline. Pro also keeps it on our server so it follows you to a new phone.
How the numbers work
Every working set gives an estimated one-rep max, using the Epley formula. You never have to test a true max.
Your best estimate on each lift is compared with published strength standards and adjusted for your sex, bodyweight, age and years trained. That gives a percentile on 51 lifts, worked out on your phone.
Your squat, bench press and deadlift together set your tier, from Iron to World Class.
Coming next
Three more apps that use the same account and the same Pro subscription.
Pricing
Free
£0
- Unlimited logging, lifts and cardio
- Estimated 1RMs and percentiles on 51 lifts
- The Iron to World Class tier ladder
- Weekly streaks and groups
- Starter routines and the plan generator
- Widgets, Live Activity and Apple Health
- Strong and Hevy import
Pro
£6.99 a month, or yearly
- The in-depth plan builder
- Readiness and recovery insights
- Smart exercise substitutes and custom exercises
- Transparent groups
- Garmin and Strava history import
- Your log kept on our server too, for a new phone
- LifeOS, with the same subscription
£6.99 is the UK price. The App Store shows the price in your currency. Full pricing
Questions
Is Peak Fettle free?
Yes. Logging, estimated 1RMs, percentiles, the tier ladder, streaks, groups, routines, widgets and Apple Health are all free. Pro adds the in-depth plan builder, recovery insights, server backup and LifeOS.
How are the percentiles worked out?
From your best estimated one-rep max on each lift, compared with published strength standards and adjusted for your sex, bodyweight, age and years trained. It runs on your phone. If you would rather not give your sex, a blended scale is used.
Where is my data?
On the free plan your workout log lives on your iPhone and works offline. Pro also stores it on our server so it survives a new phone. You can delete your account and its data from the app at any time.
Is it on Android?
Not yet. Peak Fettle is on iPhone today.
Does one Pro subscription cover the other apps?
Yes. Pro unlocks LifeOS with the same account, and Fuel and Limber are being built to use it too.
Is this medical advice?
No. Peak Fettle is a training log and tracking tool. Talk to a qualified professional before you start or change a programme, especially with an injury or a medical condition.