1 vs My 1 Rep Max
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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
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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!
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.
- 1 Rep Max calculator
- Logbook for progress tracking
- Multiple popular formulas
- Custom lift creation (Premium)
- Extended repetition calculations (Premium)
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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
Verdict
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
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.
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.
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.
| Parameter | 1 | My 1 Rep Max |
|---|---|---|
| Price | $1.99 | Free — better |
| Rating | 4.8 (1.1K ratings) — better | 4.4 (119 ratings) |
| Positive reviews | 39.4% of reviews | 57.1% of reviews — better |
| Number of ratings | 1.1K — better | 119 |
| Update frequency | Every 3 months | Every 11 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 10.0 — better | 18.6 |
| Further details — not scored | ||
| Size | 47 MB | 21 MB |
| Age rating | 9+ | 4+ |
| Developer | Bodybuilding.com | James T. Constant |
Customer experience
1
My 1 Rep Max
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
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- 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 moreShow fewer
- 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
1
No in-app purchases
My 1 Rep Max
- My 1 Rep Max Premium$7.99






