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531 Strength

531 Strength

Keep focus on your lifts

11K ratings
239 reviews
With Ads
🌟 Lifestyle
💪 Health & Fitness
Free
In-App PurchasesWith Ads

Details

  • Released
  • Updated
  • December 14, 2015
  • January 11, 2026

Features

Developer

Henrik Jachobsen
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iphone
ipad
🧾$1.99 - $6.99
In-App Purchase↘︎
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❓5 answered
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About

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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What users say

Summarized from real user reviews of 531 Strength. Based on 11K reviews and a 4.9/5 average, it highlights the 6 positives and 4 negatives reviewers mention most about this Health & Fitness app.

Positive things

  • 🚀Simple and efficient
  • 👍Intuitive interface
  • 💪Helps with strength gains
  • 🔧Customizable features
  • ⏱️Convenient timer
  • 📊Tracking and progress logging

Negative things

  • 🔢Inaccurate percentage calculations
  • 🗓️Lack of ability to plan future workouts
  • 📋Limited exercise tracking
  • 💰Paid features not worth the cost
See all reviews

What's New in 531 Strength

2.26

January 11, 2026

Thank you for using 531 Strength! This update includes: - Stability fixes - Minor UI improvements If you enjoy the app, please support the further development of the app by making an in-app purchase.

More
4

In-App Purchases

$1.99

Additional exercises

Keep track of more than the four big lifts

User reviews

Most RecentHighest RatedLowest Rated

Perfect for 5/3/1

I tried several 5/3/1 apps, and this one is the winner 👑 It’s simple, user-friendly, non-subscription-based, and can do what I need it to do.
Noah4ArkBuildingNoah4ArkBuilding

Best app for gains

By far the easiest app to use without tons of distractions or ads or random features. Literally just show up and log your WOD
SmoothlikelotionSmoothlikelotion

Marie Kondo Your Workout

This is the world’s simplest and most effective fitness app. If you feel your workouts have become overcomplicated and you’re not actually gaining much strength, declutter and use the app that gives me joy.
Visible textVisible text

Simple and Effective

Been using this app for years and it has significantly helped me with my strength milestones
HeylorHeylor

The Content is Great!! UI needs improvement

The app functions fantastic but the navigation is clunky. Swiping left and right between sets is not conducive to easily moving around different workout sets. A dropdown list of sets would be way stronger.
Beanie343Beanie343
See 234 more reviews

User experience

🐞

Reported Bugs

2 issues

Rest timer stops when app is backgrounded

Bug

Plate calculator not flexible enough

Bug
✨

Requested Features

4 requests

Ability to adjust training max separately from 1RM

Feature

Option to track rep PRs and estimated 1RM

Feature

Accessory exercise tracking and planning

Feature

Sync progress across devices

Feature

FAQ

What does the 531 Strength app do?

This app helps you follow the 5/3/1 strength training program by calculating the necessary weights, reps, and sets for each exercise based on your one-rep max (1RM). It provides a clear overview of your workout progression throughout the training cycle.

How does the app calculate weights?

You input your current 1RM for each of the four main exercises. The app then uses this information to calculate the precise weights you should be lifting for each step of the 5/3/1 cycle. It also offers an option to round these calculated weights to match the plates you have available at the gym.

Is this app free to use?

The application is free to download and use, but it does offer in-app purchases. This means some features or content may require a one-time purchase to unlock.

Who is the 531 Strength app designed for?

This app is specifically created for individuals who are already familiar with the structure and principles of the 5/3/1 strength training program. It's ideal for those who need simple and quick access to their calculated workout weights without complex interfaces.

What are the key features of the 531 Strength app?

Key features include the ability to save your current 1RM for each exercise, view calculated weights for every step in the 5/3/1 cycle, and round weights to match the plates you have available. It provides a comprehensive overview of your weights, reps, and sets.