Comparison

One Rep Max vs Rep Max Calculator

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

Head to head
About

One Rep Max

Safely estimate your maximum lift potential for various strength exercises using scientific formulas. Track your progress visually, set goals, and fine-tune estimates with perceived exertion. Ideal for powerlifters, CrossFit athletes, and strength enthusiasts.

Highlights
  • Precise 1RM calculations with 7 scientific formulas
  • RPE integration for fine-tuned estimates
  • Custom exercise tracking for any lift
  • Visual progress graphs
  • Percentage charts for training
  • Goal setting and progress monitoring
Features
Read full description

Stronger Training, Smarter Progress One Rep Max helps you safely and accurately determine your maximum lift potential for bench press, deadlift, squat, and any other strength exercise - without risking injury. Key Features: • Precise Calculations - 7 scientific formulas for accurate strength predictions: Epley, Brzycki, Lombardi, Mayhew, McGlothin, O'Conner, Wathan • RPE Integration - Factor in Rate of Perceived Exertion to fine-tune your max estimates based on how difficult sets feel • Custom Exercise Tracking - Create and monitor any lift that matters to you • Visual Progress - Beautiful graphs show your strength journey over time • Percentage Charts - Quick reference guide for training percentages • Goal Setting - Set targets and track your path to reaching them Perfect for: • Powerlifters optimizing their training cycles • CrossFit athletes tracking multiple movement patterns • Olympic weightlifters monitoring progress • Strength enthusiasts at any level Advanced Features: • Choose between multiple calculation formulas for different lift types • Track unlimited exercises with custom notes • Rate of Perceived Exertion (RPE) - Fine-tune your 1RM estimates based on how difficult sets feel • Analyze detailed statistics including volume and frequency • Set and monitor progress toward specific strength goals The Science Behind The Numbers: Our app employs multiple validated formulas to estimate your one-rep maximum based on your performance with submaximal weights. This provides you with safe strength targets before attempting potentially risky maximal lifts. Safety Note: Heavy weightlifting should always be performed with proper technique and appropriate spotting. This app provides estimates based on scientific formulas, but individual performance may vary based on experience level and training history. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Rep Max Calculator

Calculate your maximum weight for a specific number of repetitions. Ideal for powerlifting, bodybuilding, and fitness enthusiasts, it supports calculations for 1 to 40 repetitions based on the weight lifted.

Highlights
  • Calculate 1-rep max
  • Supports 1-40 repetitions
  • Weight-based calculation
  • Powerlifting, bodybuilding, fitness
  • User-friendly interface
Features
Read full description

Repeated maximum calculator. Repeated maximum (RM) is the maximum weight that can be lifted to a certain number of times. Calculation from 1 to 40 numbers of repeates by specified weight for powerlifting, bodybuilding and fitness.

Screenshots

One Rep Max4 screens
Rep Max Calculator4 screens

Verdict

The call

The clearest difference is rating: Rep Max Calculator at 5.0 against One Rep Max's 4.4. Rep Max Calculator also leads on ads (none vs shown) and review sentiment (80% vs 58%). One Rep Max's advantage is update cadence (every 6 days vs every 7 months) and ratings volume (185 vs 3). On price, in-app purchases, monetization model 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

Both are free to download. One Rep Max sells 3 in-app purchases, starting at $2.99 per month and Rep Max Calculator sells 3 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Rep Max Calculator holds the better App Store score, 5.0 against 4.4. That said, the two scores are not equally well evidenced: One Rep Max has 185 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 58% of One Rep Max's written reviews are positive against 80% of Rep Max Calculator's.

UpkeepUpdate frequency

One Rep Max ships an update every 6 days, Rep Max Calculator every 7 months. The most recent releases landed on October 23, 2026 and September 30, 2026 respectively.

Scorecard6 real differences · 4 level
One Rep Max versus Rep Max Calculator: the parameters behind the verdict, then further details
ParameterOne Rep MaxRep Max Calculator
PriceFreeFree
Rating4.4 (185 ratings)5.0 (3 ratings) — better
Positive reviews58.2% of reviews80.0% of reviews — better
Number of ratings185 — better3
Update frequencyEvery 6 days — betterEvery 7 months
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.010.0 — better
Further details — not scored
Size52 MB28 MB
Age rating4+4+
DeveloperCharles VanderhoffRoman Shimchenko

Customer experience

One Rep Max

All ratings183 ratings
Positive85.8%
Neutral2.7%
Negative11.5%
Written reviews55 reviews
Positive58.2%
Neutral9.1%
Negative32.7%

Rep Max Calculator

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews5 reviews
Positive80.0%
Neutral20.0%
Negative0.0%

Bugs and requests

One Rep Max

Reported bugs

13 issues
  • Features behind paywall
  • Forced ads
  • Deleted lifting history
  • Lost all logs with update
  • Weight limit restriction
Show 8 more
  • Reloads excessively
  • Wonky and now dead
  • Complicated and too much offered
  • Not intuitive for tracking
  • Buggy about dates and lifts
  • Cannot select other lifts
  • Only logs back squats
  • App copying content from clipboard

Requested features

7 requests
  • Allow editing of logs (date/time)
  • Manual entry for weight preferred over slider
  • Include different 1RM formulas (Epley, Brzycki)
  • Ability to create custom graphs
  • Fix weight limit restriction
Show 2 more
  • Allow logging of more than 1073 pounds
  • Update app

Rep Max Calculator

Not enough reviews yet to summarise bugs or requests.

In-app purchases

3 purchases

One Rep Max

Subscriptions2
  • 1RM Pro Monthly$2.991 Month
  • 1RM Pro Annual7 Days trial$19.991 Year
One-time1
  • 1RM Pro Lifetime$49.99
3 purchases

Rep Max Calculator

Subscriptions2
  • Monthly subscription$9.991 Month
  • Subscription for year$99.991 Year
One-time1
  • Save Settings$1.99

Questions

Is One Rep Max free?
One Rep Max is free to download, with in-app purchases available.
Is Rep Max Calculator free?
Rep Max Calculator is free to download, with in-app purchases available.
Which has better reviews, One Rep Max or Rep Max Calculator?
Rep Max Calculator is rated higher. One Rep Max averages 4.4 out of 5 from 185 ratings, while Rep Max Calculator averages 5.0 from 3 ratings.
Do One Rep Max or Rep Max Calculator have ads?
One Rep Max shows ads; Rep Max Calculator does not.
Which is updated more often, One Rep Max or Rep Max Calculator?
One Rep Max ships an update every 6 days, and Rep Max Calculator every 7 months. Most recently, One Rep Max was updated on October 23, 2026 and Rep Max Calculator on September 30, 2026.

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