531 Strength vs JuggernautAI
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.
JuggernautAI
This app uses AI to create personalized strength training programs for powerlifting and powerbuilding. It adapts to your feedback and goals, optimizing volume, frequency, and exercise selection for maximum strength gains and recovery.
- AI-generated personalized workout plans
- Powerlifting and Powerbuilding goal focus
- Adaptive training based on real-time feedback
- Optimized training frequency and volume
- Exercise selection for weak points
- Periodization strategy for fatigue management
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Juggernaut Training Systems’ revolutionary A.I. strength training system has arrived on iOS. Subscribe to JuggernautAI to access all our coaching and get stronger than you can imagine with The Smartest Program for You. Designed by legendary coach Chad Wesley Smith with revolutionary technology by Tim Arnold, JuggernautAI is like having the best strength coach in the world with you during every workout in the gym. HOW IT WORKS JuggernautAI helps you reach your strength potential using our cutting edge technology - the JuggernautAI Powerlifting and Powerbuilding system - in an efficient and easy to use way; Decide on your goal of Powerlifting, to focus on building your Squat, Bench, and Deadlift, or Powerbuilding, to balance your focus between bodybuilding and strength training. Tell us about yourself, your level of experience, and your strength goals JuggernautAI will then design a unique individualized program tailored just for you with the use of expert technology As you progress, the system will continue to adapt your training plan based on your real-time individualized feedback, ensuring you continue to grow and achieve your strength goals. WHY IT WORKS Your JuggernautAI strength program is specifically tailored to your needs and includes; ◆◆ Individualized Volume Landmarks. Do enough training to advance but not so much that you can’t recover. ◆◆ Optimized Training Frequency. Decide how many days a week you want to train, and JuggernautAI will optimize when and how often you should Squat, Bench, and Deadlift. ◆◆ Personalized Periodization Strategy. JuggernautAI finds the best way to progress to ensure you maximize your training while also managing fatigue through a strategic phasic periodization plan. ◆◆ Exercise Selection for your Weak Points. JuggernautAI looks at your weak points and your strength in individual lifts to decide which exercises will be most effective in helping you improve. As a Powerbuilding user, you can also choose which body part to focus on to ensure your physique improves the way you want it to. ◆ Real-Time Feedback Your unique individualized program continues to adapt to your feedback with our Readiness Rating System, making adjustments to your program pre-session, intra-session, session to session, week to week, block to block, and program to program Subscribe to JuggernautAI and get the smartest program for you. ———- ABOUT JUGGERNAUT TRAINING SYSTEMS Juggernaut Training Systems is The Leader in Strength, having helped thousands of athletes from beginners to World Champions maximize their results and reach their goals. We deliver principle-based coaching through cutting-edge technology to help you get the best results of your life. Privacy Policy: https://www.jtsstrength.com/app-privacy-policy/ Terms of Use: https://www.jtsstrength.com/app-terms-of-use/
Screenshots
Verdict
The clearest difference is monetization model: 531 Strength at free with in-app purchases against JuggernautAI's subscription. 531 Strength also leads on review sentiment (94% vs 73%). JuggernautAI's advantage is ads (none vs shown) and update cadence (every 4 days vs every 2 months). On price, rating, ratings volume and in-app purchases 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 JuggernautAI sells 1 in-app purchase, starting at $34.99 per month. 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 4.8 for JuggernautAI. Both are backed by a comparable volume of ratings — 12K and 5.7K respectively. Written reviews are what separate them: 94% of 531 Strength's written reviews are positive against 73% of JuggernautAI's.
531 Strength ships an update every 2 months, JuggernautAI every 4 days. Both last shipped on September 23, 2026.
| Parameter | 531 Strength | JuggernautAI |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (12K ratings) — better | 4.8 (5.7K ratings) |
| Positive reviews | 93.8% of reviews — better | 72.7% of reviews |
| Number of ratings | 12K — better | 5.7K |
| Update frequency | Every 2 months | Every 4 days — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases — better | Subscription |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.6 | 15.6 — better |
| Further details — not scored | ||
| Size | 28 MB | 108 MB |
| Age rating | 4+ | 17+ |
| Developer | Henrik Jachobsen | Juggernaut Apps |
Customer experience
531 Strength
JuggernautAI
User reviews
531 Strength
From 12K App Store ratingsWhat we love
- 🚀 Simple and efficient
- 👍 Intuitive interface
- 💪 Helps with strength gains
- 🔧 Customizable features
- ⏱️ Convenient timer
Room to improve
- 🔢 Inaccurate percentage calculations
- 🗓️ Lack of ability to plan future workouts
- 📋 Limited exercise tracking
- 💰 Paid features not worth the cost
JuggernautAI
From 5.7K App Store ratingsWhat we love
- 🚀 Excellent programming and customization
- 👍 Detailed and user-friendly app
- 🔍 Adjusts based on user feedback
- 📈 Helps users achieve their goals
- 💪 Effective for building strength and muscle
Room to improve
- 💰 Expensive monthly subscription
- 🔒 Paywall restricts access to full app
- 🕰️ Excessive time required for workouts
- 🐛 Occasional bugs and glitches
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
JuggernautAI
Reported bugs
3 issues- Clearing of workout history after each block
- Issues with the auto-timer feature
- Problems with selecting dates and times during setup
Requested features
4 requests- Integration with Apple Health or other fitness apps
- More flexibility in scheduling and workout days
- Improved exercise library and replacement options
- Better tracking and history of past workouts
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
JuggernautAI
- JuggernautAI Monthly2 variants$34.991 Month
Questions
Is 531 Strength free?
Is JuggernautAI free?
Which has better reviews, 531 Strength or JuggernautAI?
Do 531 Strength or JuggernautAI have ads?
Which is updated more often, 531 Strength or JuggernautAI?
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