Because every one of those sets ended with three reps still in the tank. OmniFit counts a set by how close to failure you took it. Log your RPE when the set ends; when the workout is done, the map shows which muscles did the work.
RPE 7: you had 3 more reps in you. Raise or lower each set's RPE and watch the count change.
RPE is your answer to one question at the end of a set: how many more reps could I have done? Two means RPE 8. None means RPE 10. OmniFit uses that answer to count every set somewhere between 0 and 1.
| 5 reps · RPE 8 | 0.57 sets |
| 10 reps · RPE 8 | 0.60 sets |
| 20 reps · RPE 8 | 0.60 sets |
All at RPE 8: stopped with two reps left.
A set to failure counts in full, but it costs more. OmniFit tracks each set's fatigue cost separately. The same 10 reps cost 0.73 at RPE 8 and 1.21 at RPE 10.
Basis: a meta-regression finding that muscle growth increases as sets end closer to failure (Robinson et al., 2024). The shape of the curve and its coefficients are our choice; what they do and don't tell you is in the Limits section below.
Every exercise in the library has a defined muscle split. On a bench press, the chest leads and the front delts and triceps follow. When you finish, OmniFit spreads your sets across your muscles using those definitions.
Sample session. The numbers come from OmniFit's own engine and exercise library.
You can share this card. There are four styles, in post or story size. Hide your weights if you like; the map stays. Send the link and the preview shows the map too.
In popular tracking apps, shoulders are one category and so is chest. OmniFit splits the shoulder into front, side and rear, the traps into upper, middle and lower, and keeps teres major apart from the lats. In your weekly analysis, tap a group to see which part of it did the work.
Same sample session. Shoulders total 4.91 sets; the rear delts got 0.91. The group total hides that. The breakdown shows it.
14 groups, 39 sub-muscles. You can use every one of them when you define your own exercise.
The library comes with 187 exercises, each with a defined muscle split. If you do a movement differently, change its split: which muscle is primary, which is secondary, which only stabilizes, and how many points each gets. Save it and it becomes your own copy in your library; every set you log with it counts by your split. Anything that isn't in the library, you add from scratch on the same screen.
Points describe each muscle's share relative to the others; they don't need to add up to 100. Edit a library exercise and it becomes your own copy; the original stays the same for everyone.
10 reps at RPE 10, run through OmniFit's own formula.
Counting and the map come after logging. Everything in this section is free.
These three are in Pro. All of them come from your own logs; when there isn't enough data, they say so instead of showing a number.
See how many sets each muscle counted this week. Sets that couldn’t be counted because RPE was missing are listed separately, so nothing silently drops out.
Compares the last 7 days with the last 28. If you ramped up suddenly, you'll see it here. We don't show the ratio until you have at least 8 training days in 28.
Counted sets divided by fatigue cost. Sets to failure count more, but they cost more. RPE 8 and RPE 10 come out almost even; sets you stopped early fall behind.
Every app logs sets. OmniFit's difference starts after the log.
In most appsShoulders are one category. So is chest.
In OmniFit14 groups, 39 sub-muscles. Front, side and rear delts count separately, and so do the three parts of the traps.
In most appsYou tag one main muscle and a few secondary ones.
In OmniFitYou give every muscle a role and points. Each set is split across muscles the way you defined it.
In most appsSets per muscle are counted.
In OmniFitEach set counts between 0 and 1 depending on how close to failure it went. Fatigue cost is tracked separately.
Comparison based on popular tracking apps' own help and feature pages as of October 2026.
Training with a coach? Your coach writes the program in OmniFit and it lands on your phone. Every set you log shows up on your coach's dashboard.
For coachesIt can't tell you. The numbers come from the RPE you enter. Guess your RPE and the number is a guess too.
It can't tell you that either. The load ratio shows how much your last week went up compared with the month before. That's all.
No. How each exercise splits across muscles is a defined table. In Pro, you can edit the split for your own exercises.
No. It shows the numbers; you or your coach decide what to change.
Further reading: Robinson et al. 2024 · Refalo et al. 2023, 2024 · Pelland et al. 2026 · Impellizzeri et al. 2020. These support the idea; they don't validate OmniFit's coefficients.
You turn on Pro from your account page.
At the end of a set, ask yourself how many more reps you could have done. Two means RPE 8, one means RPE 9, none means RPE 10. Everyone misjudges it a little at first; after a few weeks your estimates settle.
The set is still logged, and your tonnage, records and estimated 1RM are calculated. It just doesn't go into counted sets. We don't fill in missing RPE with guesses.
Each exercise in the library was defined one by one from published sources: which muscle is primary, which is secondary, which stabilizes. It's a table, not a measurement taken on your body. If you disagree with one, edit it in Pro.
In Pro, add it from scratch: its name, equipment, and how much it works each muscle. On the free plan you use the library's exercises.
For now it runs in the browser. Open it on your phone and add it to your home screen, and it opens like an app. iOS and Android apps are on the way.
No problem. The sets you enter are kept on your phone and sent once you're back online.
Enter your coach's invite code and your program arrives on your phone. Your history stays in your account; if the coaching ends, it's still yours.
When you're done, you'll see how many sets counted and which muscles did the work.
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