Comparison

531 Trainer vs Intensity

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

Head to head
About

531 Trainer

Simplify your strength training with this app. It calculates your daily workouts based on your max lifts, eliminating the need for spreadsheets or manual calculations at the gym. Easily progress to the next cycle with automatic weight increments.

Highlights
  • Calculates daily workouts
  • Automatic weight progression
  • One Rep Max calculator
  • Assistance work percentage calculator
  • Supports kilograms or pounds
  • Visual weight plate guidance
Features
Read full description

5/3/1 made easy You no longer need to deal with clunky spreadsheets or fumble around at the gym trying to find your numbers. Everything is right on your phone and easy to access. Simply enter your max for military press, deadlift, bench press and squat once and have each day's workout calculated for you. When you finish a cycle, hitting just one button increments the weight for each of your lifts leaving you ready to quickly continue your training. Features: - One Rep Max Calculator - Assistance Work Percent Calculator - Uses Kilograms or Pounds - Program persistence - Visual information on what weight plates to use Icons Provided By Icons8 icons8.com/web-app/364/Settings icons8.com/web-app/437/Twitter icons8.com/web-app/435/Facebook icons8.com/web-app/94/Lock icons8.com/web-app/152/Unlock

About

Intensity

This app helps you optimize your training for progression by tracking your strength and progress. It offers a user-friendly interface for planning and logging workouts, with in-depth stats, custom goals, and personal record tracking.

Highlights
  • Workout planning and logging
  • In-depth training statistics
  • Customizable goals and personal records
  • Support for popular powerlifting programs
  • AI program generation
  • Cloud sync across platforms
  • Apple Watch app
Read full description

An ad free workout tracking app to optimize your training for progression. Intensity is focused on getting you better than you were yesterday. Intensity has an interface that makes tracking easy. Plan an entire workout in advance, or log it as you go. Designed for progression, it has everything you need right at your finger tips. This includes in-depth stats to identify trends in your training, custom goals to push you to progress, and the ability to easily view your personal records. Intensity includes popular powerlifting programs such as 5/3/1, Starting Strength, Stronglifts 5x5, The Texas Method, Smolov, Scheiko, The Juggernaut Method, GZCL, Candito programs, Kizen programs, and practically every other popular powerlifting program you can think of. If you can't find what you are looking for, you can build your own programs, customize existing programs, import programs, or use AI to generate a program. With your workouts stored securely in the cloud, access your data whenever you need it. You can access your data on all major platforms. Apple Watch app to access your workouts with or without your iPhone You can import data from popular apps such as Strong, Hevy, FitNotes, and Stronglifts 5x5. You can also export all your workouts for further analysis. Intensity includes social features where you can add your friends, share workouts, and compete on the leaderboard. Other features include: • Sync your workouts with Apple Health • Timer & stopwatch • Interval timer • Bodyweight tracker • 1RM calculator • Plate calculator with custom plate settings • IPF-GL, Wilks, and DOTS calculator • Warmup calculator with the ability to add custom warmup methods • Light/dark mode • Supports multiple languages Use Intensity as the ultimate tracking tool that will last you your entire lifting lifetime. Intensity is free to download and use. Should you choose to upgrade to Intensity Premium, we offer an auto-renewing subscription option for $2.99USD/month, an auto-renewing subscription option for $17.99USD/year, and one singular payment option for $34.99USD: Payment will be charged to your credit card through your iTunes account at confirmation of purchase. Subscription renews automatically unless cancelled at least 24 hours prior to the end of the subscription period. There is no increase in price when renewing. Subscriptions can be managed and auto-renewal turned off in Account Settings in iTunes after purchase. Once purchased, refunds will not be provided for any unused portion of the term. Read our full Terms of Service and our Privacy Policy at https://www.intensityapp.com/terms-conditions and https://www.intensityapp.com/privacy-policy.

Screenshots

531 Trainer4 screens
Intensity4 screens

Verdict

The call

The clearest difference is in-app purchases: 531 Trainer at none against Intensity's 3. 531 Trainer also leads on review sentiment (82% vs 64%) and iOS requirement (7.1 vs 15.6). Intensity's advantage is rating (4.6 vs 4.3) and ratings volume (191 vs 10). On price, update cadence and ads 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. Intensity sells 3 in-app purchases, starting at $2.99 per month. 531 Trainer asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Intensity holds the better App Store score, 4.6 against 4.3. That said, the two scores are not equally well evidenced: Intensity has 191 ratings behind it against 10, so its average is the more settled of the two. Written reviews complicate that: 82% of 531 Trainer's written reviews are positive against 64% of Intensity's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

531 Trainer ships an update fortnightly, Intensity every 4 weeks. The most recent releases landed on October 23, 2026 and October 21, 2026 respectively.

Scorecard7 real differences · 3 level
531 Trainer versus Intensity: the parameters behind the verdict, then further details
Parameter531 TrainerIntensity
PriceFreeFree
Rating4.3 (10 ratings)4.6 (191 ratings) — better
Positive reviews81.8% of reviews — better64.2% of reviews
Number of ratings10191 — better
Update frequencyFortnightly — betterEvery 4 weeks
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPodiPhone, iPad, iPod, Apple Watch — better
Requires iOS7.1 — better15.6
Further details — not scored
Size2 MB44 MB
Age rating4+4+
DeveloperKevin FrenchTaylor Hamling

Customer experience

531 Trainer

All ratings10 ratings
Positive90.0%
Neutral0.0%
Negative10.0%
Written reviews11 reviews
Positive81.8%
Neutral9.1%
Negative9.1%

Intensity

All ratings174 ratings
Positive90.2%
Neutral2.3%
Negative7.5%
Written reviews53 reviews
Positive64.2%
Neutral11.3%
Negative24.5%

Bugs and requests

531 Trainer

Not enough reviews yet to summarise bugs or requests.

Intensity

Reported bugs

25 issues
  • Workouts not saving
  • App randomly closes
  • Metrics shifting between kg and lb
  • App crashes with 'Unable to Load App' error
  • Workout diary not accurately tracking days
Show 20 more
  • App freezes/crashes and deletes logged workouts
  • Buttons overlapping or disappearing
  • App navigates to random dates during logging
  • Annoying red bar covering exercises
  • Deleted all data after update
  • Sets not being saved
  • Updates to weight/reps not saved
  • Erasing parts of previous workouts
  • App requests clipboard access
  • New update causes app to lock up
  • Search bar not bringing up past exercises
  • Pop-up about settings not working
  • App stops registering taps in correct locations
  • App not responding to taps
  • Losing training notes after updates
  • Sets disappearing after adding
  • Diary not showing logged workouts
  • Resetting diary not possible
  • Units converting incorrectly
  • Workouts being erased

Requested features

11 requests
  • Add widgets
  • Dark mode option
  • Display RPE on main screen
  • Track RPE with every set
  • Abbreviate drop sets/super sets
Show 6 more
  • CSV interop with Excel
  • Rest timer during set updates
  • Copy diary option
  • Optimized for iPhone X screen
  • Plate calculator more accessible
  • Offline mode

In-app purchases

None

531 Trainer

No in-app purchases

3 purchases

Intensity

Subscriptions2
  • Intensity Premium$2.991 Month
  • Intensity Premium Yearly$17.991 Year
One-time1
  • Intensity Lifetime Premium$34.99

Questions

Is 531 Trainer free?
531 Trainer is free to download, with no in-app purchases.
Is Intensity free?
Intensity is free to download, with in-app purchases available.
Which has better reviews, 531 Trainer or Intensity?
Intensity is rated higher. 531 Trainer averages 4.3 out of 5 from 10 ratings, while Intensity averages 4.6 from 191 ratings.
Do 531 Trainer or Intensity have ads?
Neither 531 Trainer nor Intensity shows ads.
Which is updated more often, 531 Trainer or Intensity?
531 Trainer ships an update fortnightly, and Intensity every 4 weeks. Most recently, 531 Trainer was updated on October 23, 2026 and Intensity on October 21, 2026.

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