Comparison

1 vs JuggernautAI

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

Head to head
About

1

Easily calculate and track your one-rep max (1RM) for any lift. Estimate your maximum weight safely without testing, and monitor your progress over time with detailed charts. Improve your training with expert articles.

Highlights
  • Calculate 1RM and percentages
  • Support for various lifts
  • Track 1RM history with charts
  • Add notes to calculations
  • Access expert training articles
  • Imperial/metric system support
Features
Read full description

Whether you're a competitive lifter or just want to improve your strength and fitness, your one-rep max (1RM) is an essential tool. Calculate your max safely and easily, and then track it over time, on any lift with our easy-to-use calculator! In the simplest terms, your 1RM is the amount of weight you can lift for one rep on any given lift. In general, it’s good to know your max for key lifts like the squat, bench press, and deadlift, but your 1RM is critical even if you never plan to train that heavy. Many lifting programs are designed with a percent of your rep max in mind, and may call for something like using 65% of your 1RM for a given exercise. When you see that, you have to either test for your 1RM or estimate it. Testing your 1RM can be pretty intense, and it requires a high degree of caution to avoid injury. Fortunately, you can estimate your 1RM without testing it! Exercise scientists have devised a formula that's fairly accurate for most people, which is what powers this calculator. Our calculator makes it easy to calculate and track your 1RM and multiple percentages of it for every lift in the book! Features: · Calculate your 1RM and percentages · Choose from a variety of lifts (deadlift, bench press, squat, etc.), or add your own · Track and chart your 1RM history for each type of lift · Add notes each time you calculate your 1RM · Improve your weight training with articles by Bodybuilding.com experts · Choose imperial or metric system · Incredibly easy to use!

About

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.

Highlights
  • 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
Features
Read full description

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

14 screens
JuggernautAI4 screens

Verdict

The call

The clearest difference is price: JuggernautAI at Free against 1's $1.99. JuggernautAI also leads on review sentiment (73% vs 39%) and update cadence (every 4 days vs every 3 months). 1's advantage is in-app purchases (none vs 2) and iOS requirement (10.0 vs 15.6). On rating, ads and device support 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

JuggernautAI is free to download; 1 costs $1.99 up front. JuggernautAI sells 1 in-app purchase, starting at $34.99 per month. 1 asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.8 for 1 against 4.8 for JuggernautAI. That said, the two scores are not equally well evidenced: JuggernautAI has 5.7K ratings behind it against 1.1K, so its average is the more settled of the two. Written reviews are what separate them: 39% of 1's written reviews are positive against 73% of JuggernautAI's.

UpkeepUpdate frequency

1 ships an update every 3 months, JuggernautAI every 4 days. Both last shipped on October 14, 2026.

Scorecard7 real differences · 3 level
1 versus JuggernautAI: the parameters behind the verdict, then further details
Parameter1JuggernautAI
Price$1.99Free — better
Rating4.8 (1.1K ratings)4.8 (5.7K ratings)
Positive reviews39.4% of reviews72.7% of reviews — better
Number of ratings1.1K5.7K — better
Update frequencyEvery 3 monthsEvery 4 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterSubscription
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS10.0 — better15.6
Further details — not scored
Size47 MB108 MB
Age rating9+17+
DeveloperBodybuilding.comJuggernaut Apps

Customer experience

1

All ratings1,056 ratings
Positive95.5%
Neutral2.7%
Negative1.9%
Written reviews33 reviews
Positive39.4%
Neutral18.2%
Negative42.4%

JuggernautAI

All ratings5,655 ratings
Positive97.0%
Neutral1.2%
Negative1.7%
Written reviews216 reviews
Positive72.7%
Neutral4.2%
Negative23.1%

User reviews

1

From 1.1K App Store ratings

What we love

  • 🚀 Great for calculating reps
  • 👍 Good, simple app
  • 👍 Quick easy to use tool

Room to improve

  • 🐛 Numbers won't work
  • 🐛 Single digit reps only
  • 🐛 Links to articles not working
  • 🐛 Keeps billing user
  • 🐛 Inability to filter exercise history

JuggernautAI

From 5.7K App Store ratings

What 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

1

Reported bugs

8 issues
  • Numbers won't work
  • Single digit reps only
  • Links to articles not working
  • Keeps billing user
  • Inability to filter exercise history
Show 3 more
  • Cannot modify notes or dates
  • Lack of decimal support
  • Cannot upload old data

Requested features

11 requests
  • Show max weight for different rep ranges
  • Option to count uneven weights
  • Display percentages at all times
  • Show percentile of max among lifters
  • Allow selecting exercise to see PR chart
Show 6 more
  • Ability to modify dates of lifts
  • Add more weight increments
  • Expand note functionality
  • Add set tracking
  • Allow decimal weight input
  • Provide more detailed progress reporting

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

None

1

No in-app purchases

1 purchases

JuggernautAI

Subscriptions1
  • JuggernautAI Monthly2 variants$34.991 Month

Questions

Is 1 free?
1 costs $1.99, with no in-app purchases.
Is JuggernautAI free?
JuggernautAI is free to download, with in-app purchases available.
Which has better reviews, 1 or JuggernautAI?
1 and JuggernautAI are both rated 4.8 out of 5 on the App Store, from 1.1K and 5.7K ratings respectively.
Do 1 or JuggernautAI have ads?
Neither 1 nor JuggernautAI shows ads.
Which is updated more often, 1 or JuggernautAI?
1 ships an update every 3 months, and JuggernautAI every 4 days. Most recently, 1 was updated on October 14, 2026 and JuggernautAI on October 14, 2026.

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