# 1RM Calculator vs 1RM Calculator

The clearest difference is review sentiment: 1RM Calculator at 100% against 1RM Calculator's 37%. 1RM Calculator also leads on rating (4.9 vs 4.5). 1RM Calculator's advantage is update cadence (every 3 weeks vs every 4 months) and iOS requirement (12.1 vs 15.0). On price, ratings volume, ads and in-app purchases there is nothing between them.

Both are free to download. 1RM Calculator sells 1 one-off in-app purchase and 1RM Calculator sells 3 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

1RM Calculator holds the better App Store score, 4.9 against 4.5. Both are backed by a comparable volume of ratings — 222 and 130 respectively. Written reviews point the same way: 37% of 1RM Calculator's written reviews are positive against 100% of 1RM Calculator's.

1RM Calculator ships an update every 3 weeks, 1RM Calculator every 4 months. The most recent releases landed on November 6, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | 1RM Calculator | 1RM Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (222 ratings)](https://appshunter.io/ios/app/1rm-calculator-one-rep-max/id681279192/reviews) | **[4.9 (130 ratings)](https://appshunter.io/ios/app/1rm-calculator/id1566775126/reviews)** |
| Number of ratings | **222** | 130 |
| Positive reviews | 36.8% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 4 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 20 MB | 28 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) | [Yuri Koshiishi](https://appshunter.io/developer/1566775128) |

## 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


### 1RM Calculator

[App page](https://appshunter.io/ios/app/1rm-calculator/id1566775126)

Easily calculate your one-rep max (1RM) strength with this app. It supports RPE input and allows you to estimate rep maxes based on your 1RM. Track your progress by saving your 1RM history for different exercises.

**Highlights:** 1RM calculation with RPE, Rep max estimation, Save 1RM history, Customizable exercises, Dark theme

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Rep Max Pro Monthly | $1.99 | per month |
| 1 Rep Max Pro Annual | $9.99 | per year |
| 1 Rep Max Pro Lifetime | $29.99 | one-time |


## Frequently asked questions

### Is 1RM Calculator free?

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

### Is 1RM Calculator free?

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

### Which has better reviews, 1RM Calculator or 1RM Calculator?

1RM Calculator is rated higher. 1RM Calculator averages 4.5 out of 5 from 222 ratings, while 1RM Calculator averages 4.9 from 130 ratings.

### Do 1RM Calculator or 1RM Calculator have ads?

Neither 1RM Calculator nor 1RM Calculator shows ads.

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

1RM Calculator ships an update every 3 weeks, and 1RM Calculator every 4 months. Most recently, 1RM Calculator was updated on November 6, 2026 and 1RM Calculator 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.*