Comparison

1 vs My 1 Rep Max

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

My 1 Rep Max

Estimate your one rep max weight for various lifts using popular formulas. Track your progress over time with a built-in logbook. Offers custom lift creation and extended repetition calculations with a premium upgrade.

Highlights
  • 1 Rep Max calculator
  • Logbook for progress tracking
  • Multiple popular formulas
  • Custom lift creation (Premium)
  • Extended repetition calculations (Premium)
Read full description

Know your strength. Track your progress. Keep getting stronger. My 1 Rep Max gives you a fast, simple way to estimate your one-rep max and keep a record of the lifts that matter to you. Choose your lift, enter the weight and reps, and instantly see your estimated 1RM along with training percentages. Choose from several of the most popular 1 Rep Max formulas so you can calculate your results the way you prefer. Save your lifts to your lift log and build a history of your training over time. Whether you're chasing a new bench press PR, building your squat, improving your deadlift, or simply trying to get stronger, My 1 Rep Max helps you see where you are and where you're headed. GO FURTHER WITH MY 1 REP MAX PREMIUM Premium gives you more control over your training and more insight into your progress: • See your progress over time with interactive charts • Create your own custom lifts • Calculate your 1RM using more than 10 repetitions • Unlock all Premium features with one purchase — no subscription Simple when you need a quick calculation. Powerful enough to become part of your training. A NOTE ABOUT SAFETY One-rep max calculations are estimates, and accuracy can vary based on training experience, technique, fatigue, individual physiology, and other factors. Attempting a true one-rep maximum can involve significant risk. Use appropriate safety equipment, have a qualified spotter when necessary, and never attempt a weight you do not feel prepared to lift safely.

Screenshots

14 screens
My 1 Rep Max4 screens

Verdict

The call

The clearest difference is price: My 1 Rep Max at Free against 1's $1.99. My 1 Rep Max also leads on update cadence (every 11 days vs every 3 months) and review sentiment (57% vs 39%). 1's advantage is in-app purchases (none vs 1) and rating (4.8 vs 4.4). On 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

My 1 Rep Max is free to download; 1 costs $1.99 up front. My 1 Rep Max sells 1 one-off in-app purchase. 1 asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

1 holds the better App Store score, 4.8 against 4.4. That said, the two scores are not equally well evidenced: 1 has 1.1K ratings behind it against 119, so its average is the more settled of the two. Written reviews complicate that: 39% of 1's written reviews are positive against 57% of My 1 Rep Max's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

1 ships an update every 3 months, My 1 Rep Max every 11 days. The most recent releases landed on October 29, 2026 and October 24, 2026 respectively.

Scorecard9 real differences · 1 level
1 versus My 1 Rep Max: the parameters behind the verdict, then further details
Parameter1My 1 Rep Max
Price$1.99Free — better
Rating4.8 (1.1K ratings) — better4.4 (119 ratings)
Positive reviews39.4% of reviews57.1% of reviews — better
Number of ratings1.1K — better119
Update frequencyEvery 3 monthsEvery 11 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS10.0 — better18.6
Further details — not scored
Size47 MB21 MB
Age rating9+4+
DeveloperBodybuilding.comJames T. Constant

Customer experience

1

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

My 1 Rep Max

All ratings119 ratings
Positive82.4%
Neutral7.6%
Negative10.1%
Written reviews14 reviews
Positive57.1%
Neutral14.3%
Negative28.6%

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

My 1 Rep Max

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

1

No in-app purchases

1 purchases

My 1 Rep Max

One-time1
  • My 1 Rep Max Premium$7.99

Questions

Is 1 free?
1 costs $1.99, with no in-app purchases.
Is My 1 Rep Max free?
My 1 Rep Max is free to download, with in-app purchases available.
Which has better reviews, 1 or My 1 Rep Max?
1 is rated higher. 1 averages 4.8 out of 5 from 1.1K ratings, while My 1 Rep Max averages 4.4 from 119 ratings.
Do 1 or My 1 Rep Max have ads?
Neither 1 nor My 1 Rep Max shows ads.
Which is updated more often, 1 or My 1 Rep Max?
1 ships an update every 3 months, and My 1 Rep Max every 11 days. Most recently, 1 was updated on October 29, 2026 and My 1 Rep Max on October 24, 2026.

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