# 1RM Calculator vs One Rep Max

The clearest difference is ads: 1RM Calculator at none against One Rep Max's shown. 1RM Calculator also leads on iOS requirement (12.1 vs 15.0). One Rep Max's advantage is review sentiment (57% vs 37%) and update cadence (every 6 days vs every 3 weeks). On price, rating, ratings volume and in-app purchases there is nothing between them.

Both are free to download. 1RM Calculator sells 1 one-off in-app purchase and One Rep Max sells 2 in-app purchases, starting at $2.99 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 — 4.5 for 1RM Calculator against 4.4 for One Rep Max. Both are backed by a comparable volume of ratings — 222 and 186 respectively. Written reviews are what separate them: 37% of 1RM Calculator's written reviews are positive against 57% of One Rep Max's.

1RM Calculator ships an update every 3 weeks, One Rep Max every 6 days. The most recent releases landed on November 6, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | 1RM Calculator | One Rep Max |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (222 ratings)](https://appshunter.io/ios/app/1rm-calculator-one-rep-max/id681279192/reviews)** | [4.4 (186 ratings)](https://appshunter.io/ios/app/one-rep-max-1rm-calculator/id950621710/reviews) |
| Number of ratings | **222** | 186 |
| Positive reviews | 36.8% of reviews | **57.1% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 weeks | **Every 6 days** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 20 MB | 52 MB |
| Requires iOS | **12.1** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [David Bai](https://appshunter.io/developer/609405595) | [Charles Vanderhoff](https://appshunter.io/developer/950621709) |

## What reviewers say

### 1RM Calculator

[App page](https://appshunter.io/ios/app/1rm-calculator-one-rep-max/id681279192)

Estimate your maximum weight lifted for a single repetition. Input your successful lifts and reps to gauge strength, compare progress, and plan future training. Offers advanced features for detailed tracking and analysis.

**Highlights:** Estimate 1-rep max, Track lift history and progress, Historical chart and list views, Multiple estimation formulas, Calculate multiple rep maxes, Switch between lbs and kgs, View percentages of 1-rep max

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Upgrade | $1.99 | one-time |

**What reviewers like**

- 👍 Simple and easy to use
- 🚀 Calculates 1 rep max quickly
- 💡 Helps figure out percentages
- 👍 Good for tracking routines
- 👍 Clean design

**What reviewers complain about**

- 🐛 Pro version not working
- 🐛 Paid features inaccessible
- 🐛 App crashes after upgrade
- 🐛 UI needs improvement
- 🐛 Missing features

**Reported bugs**

- Pro not working after purchase
- Paid upgrade not granting access
- App crashes after upgrade
- Feedback email link broken
- + button crashes app

**Requested features**

- Ability to re-arrange exercises
- Ability to re-name exercises
- Ability to delete exercises
- See all trend lines on one graph
- Track more than one set per day


### One Rep Max

[App page](https://appshunter.io/ios/app/one-rep-max-1rm-calculator/id950621710)

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:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1RM Pro Monthly | $2.99 | per month |
| 1RM Pro Annual | $19.99 | per year |

**What reviewers like**

- 👍 Easy to use interface
- 📊 Tracks progress with charts
- ➕ Plate calculator bonus feature
- 📈 Supports multiple 1RM formulas
- 💪 Helpful for tracking RMs

**What reviewers complain about**

- 💰 Subscription required for features
- 💸 Features moved behind paywall
- 😩 Useless without subscription
- 🚫 Basic features now paid
- 💸 High subscription cost

**Reported bugs**

- Features behind paywall
- Forced ads
- Deleted lifting history
- Lost all logs with update
- Weight limit restriction

**Requested features**

- 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


## Frequently asked questions

### Is 1RM Calculator free?

1RM Calculator is free to download, with in-app purchases available.

### Is One Rep Max free?

One Rep Max is free to download, with in-app purchases available.

### Which has better reviews, 1RM Calculator or One Rep Max?

1RM Calculator is rated higher. 1RM Calculator averages 4.5 out of 5 from 222 ratings, while One Rep Max averages 4.4 from 186 ratings.

### Do 1RM Calculator or One Rep Max have ads?

One Rep Max shows ads; 1RM Calculator does not.

### Which is updated more often, 1RM Calculator or One Rep Max?

1RM Calculator ships an update every 3 weeks, and One Rep Max every 6 days. Most recently, 1RM Calculator was updated on November 6, 2026 and One Rep Max on November 7, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*