Comparison

531 Strength vs 1RM Weight Lifting Rep Max

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Calculate 5/3/1 weights
  • Track 1RM for exercises
  • View cycle step weights
  • Round weights to available plates
  • Full overview of weights, reps, sets
Features
Read full description

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.

About

1RM Weight Lifting Rep Max

This app calculates your personalized 1 Rep Max for weightlifting based on your performance type. Log your workouts, track progress with charts, and discover personalized formulas for maximum accuracy. Upgrade to Pro for full functionality.

Highlights
  • Personalized 1 Rep Max calculation
  • Strength, Midrange, Endurance, Custom types
  • Log weight lifted by percentage
  • Track progress with history
  • Analyze progress with chart diagrams
  • History module for past workouts
Features
Read full description

1RM Weight Lifting Rep Max is a first personalized bodybuilding calculator and gym tracker. The formula is personalized to calculate the most accurate 1 Rep Max based on your unique performance type. Choose if you belong to Strength, Midrange, or Endurance types. Or, go for a Custom advanced calculation for maximum accuracy. Discover more functions that allow you to focus on what matters while we’re dealing with the numbers. No need to take notes of your rep max per each exercise - our history module’s got your back. • Calculate Get the most accurate 1 Rep Max per each exercise based on your performance type - the app will personalize a formula according to your unique training characteristics. • Log Log the percentage and the app will calculate the weight to lift in either lbs or kgs based on your choice. • Track See your previous progress by exercise, both in Rep Max percentage and actual numbers. • Analyze Analyze your progress at a glance with chart diagrams. Upgrade to 1RM Pro to unlock all the functions. 1RM Pro can be purchased as a monthly subscription. You can find detailed information according plans and prices within the application. Prices and plans are subject to change. Payment will be charged to your iTunes Account at confirmation of purchase. Subscriptions automatically renew at the end of the period, for the same price. You can turn off auto-renewal at any time up until 24-hours before the end of the subscription period in your Account Settings. When you cancel the auto-renewal, access to the Pro features will not expire immediately, you will have access until the end of the current payment period. You can manage your subscription by visiting the iTunes Account Settings after purchase. Privacy Policy: https://bit.ly/2MhxY2c Terms of Use: https://bit.ly/2IRY4a3

Screenshots

531 Strength4 screens
1RM Weight Lifting Rep Max4 screens

Verdict

The call

The clearest difference is review sentiment: 531 Strength at 94% against 1RM Weight Lifting Rep Max's 50%. 531 Strength also leads on rating (4.9 vs 2.3) and ratings volume (12K vs 3). 1RM Weight Lifting Rep Max's advantage is ads (none vs shown) and iOS requirement (11.0 vs 18.0). On price, update cadence, 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. 531 Strength sells 4 one-off in-app purchases and 1RM Weight Lifting Rep Max sells 1 in-app purchase, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

531 Strength holds the better App Store score, 4.9 against 2.3. That said, the two scores are not equally well evidenced: 531 Strength has 12K ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 94% of 531 Strength's written reviews are positive against 50% of 1RM Weight Lifting Rep Max's.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on November 11, 2026 and November 3, 2026 respectively.

Scorecard5 real differences · 5 level
531 Strength versus 1RM Weight Lifting Rep Max: the parameters behind the verdict, then further details
Parameter531 Strength1RM Weight Lifting Rep Max
PriceFreeFree
Rating4.9 (12K ratings) — better2.3 (3 ratings)
Positive reviews94.0% of reviews — better50.0% of reviews
Number of ratings12K — better3
Update frequencyEvery 2 monthsEvery 2 months
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchasesFreemium
DevicesiPhone, iPadiPhone, iPod
Requires iOS18.011.0 — better
Further details — not scored
Size26 MB18 MB
Age rating4+4+
DeveloperHenrik JachobsenMaksym Kravchenko

Customer experience

531 Strength

All ratings11,645 ratings
Positive98.0%
Neutral1.2%
Negative0.8%
Written reviews282 reviews
Positive94.0%
Neutral2.8%
Negative3.2%

1RM Weight Lifting Rep Max

All ratings3 ratings
Positive33.3%
Neutral0.0%
Negative66.7%
Written reviews2 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

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

1RM Weight Lifting Rep Max

Not enough reviews yet to summarise bugs or requests.

In-app purchases

4 purchases

531 Strength

One-time4
  • Additional exercises$1.99
  • Adjustable set$1.99
  • Plate calculator$1.99
Show 1 more
  • Progress log$6.99
1 purchases

1RM Weight Lifting Rep Max

Subscriptions1
  • 1RM Pro (1 Month)$0.991 Month

Questions

Is 531 Strength free?
531 Strength is free to download, with in-app purchases available.
Is 1RM Weight Lifting Rep Max free?
1RM Weight Lifting Rep Max is free to download, with in-app purchases available.
Which has better reviews, 531 Strength or 1RM Weight Lifting Rep Max?
531 Strength is rated higher. 531 Strength averages 4.9 out of 5 from 12K ratings, while 1RM Weight Lifting Rep Max averages 2.3 from 3 ratings.
Do 531 Strength or 1RM Weight Lifting Rep Max have ads?
531 Strength shows ads; 1RM Weight Lifting Rep Max does not.
Which is updated more often, 531 Strength or 1RM Weight Lifting Rep Max?
531 Strength ships an update every 2 months, and 1RM Weight Lifting Rep Max every 2 months. Most recently, 531 Strength was updated on November 11, 2026 and 1RM Weight Lifting Rep Max on November 3, 2026.

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