531 Strength vs One Rep Max
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
531 Strength
This app simplifies tracking your progress on the 5/3/1 strength training program. It calculates and displays weights, reps, and sets based on your one-rep max, allowing you to easily plan and execute your workouts. Rounding options help match available gym plates.
- Calculate 5/3/1 weights
- Track 1RM for exercises
- View cycle step weights
- Round weights to available plates
- Full overview of weights, reps, sets
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Makes it quick and easy to get a full overview of all weights, reps and sets based off your 1RM when you’re following the 5/3/1 program. - Save your current 1 RM for each of the four exercises - View calculated weights for each step in the cycle - Round the weight to match the plates you have available This app is made for people who are familiar with the structure of the 5/3/1 program and who needs simple access to the calculated weights for each exercise.
One Rep Max
Easily calculate your One Rep Max (1RM) for various strength exercises. Track your progress over time with saved calculations, view personalized percentages, and visualize your strength gains through charts. Supports multiple exercise types and custom units.
- Calculate One Rep Max
- Save and track progress
- View 1RM percentages
- Log multiple exercise types
- Create custom exercises
- View strength gain charts
- Imperial or Metric units
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Calculate your One Rep Max from 2-12 max effort performed reps. Features: - Quickly & easily calculate your One Rep Max - Save calculations to track progress - View your 1RM percentages e.g. "70% one rep max" - Log multiple exercise types (Deadlift, benchpress, front squat etc.) - Create & add your own exercise types - View max weight history by exercise type - View charts showing your strength gains over time - Select a custom date when adding entries - Choose Imperial or Metric units
Screenshots
Verdict
531 Strength and One Rep Max both sit at 4.9 stars, but that hides the real split: 94% of 531 Strength's written reviews are positive against 33% of One Rep Max's. 531 Strength also leads on ratings volume (12K vs 1). One Rep Max's advantage is ads (none vs shown) and update cadence (every 10 days vs every 2 months). On price, rating, in-app purchases and monetization model there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. 531 Strength sells 4 one-off in-app purchases and One Rep Max sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
On the App Store both sit at effectively the same score — 4.9 for 531 Strength against 5.0 for One Rep Max. That said, the two scores are not equally well evidenced: 531 Strength has 12K ratings behind it against 1, so its average is the more settled of the two. Written reviews are what separate them: 94% of 531 Strength's written reviews are positive against 33% of One Rep Max's.
531 Strength ships an update every 2 months, One Rep Max every 10 days. Both last shipped on November 11, 2026.
| Parameter | 531 Strength | One Rep Max |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (12K ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 94.0% of reviews — better | 33.3% of reviews |
| Number of ratings | 12K — better | 1 |
| Update frequency | Every 2 months | Every 10 days — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 18.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 26 MB | 13 MB |
| Age rating | 4+ | 17+ |
| Developer | Henrik Jachobsen | App Ktchn Ltd |
Customer experience
531 Strength
One Rep Max
Bugs and requests
531 Strength
Reported bugs
2 issues- Rest timer stops when app is backgrounded
- Plate calculator not flexible enough
Requested features
4 requests- Ability to adjust training max separately from 1RM
- Option to track rep PRs and estimated 1RM
- Accessory exercise tracking and planning
- Sync progress across devices
One Rep Max
Not enough reviews yet to summarise bugs or requests.
In-app purchases
531 Strength
- Additional exercises$1.99
- Adjustable set$1.99
- Plate calculator$1.99
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- Progress log$6.99
One Rep Max
- 1RM Pro Lifetime$4.99
Questions
Is 531 Strength free?
Is One Rep Max free?
Which has better reviews, 531 Strength or One Rep Max?
Do 531 Strength or One Rep Max have ads?
Which is updated more often, 531 Strength or One Rep Max?
Other comparisons
