# 1 vs 1RM Calculator

1 and 1RM Calculator both sit at 4.8 stars, but that hides the real split: 100% of 1RM Calculator's written reviews are positive against 39% of 1's. 1RM Calculator also leads on price (Free vs $1.99). 1's advantage is in-app purchases (none vs 3) and ratings volume (1.1K vs 126). On rating, update cadence, ads and device support there is nothing between them.

1RM Calculator is free to download; 1 costs $1.99 up front. 1RM Calculator sells 3 in-app purchases, starting at $1.99 per month. 1 asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.8 for 1 against 4.8 for 1RM Calculator. That said, the two scores are not equally well evidenced: 1 has 1.1K ratings behind it against 126, so its average is the more settled of the two. Written reviews are what separate them: 39% of 1's written reviews are positive against 100% of 1RM Calculator's.

1 ships an update every 3 months, 1RM Calculator every 4 months. The most recent releases landed on October 29, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | 1 | 1RM Calculator |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | [4.8 (1.1K ratings)](https://appshunter.io/ios/app/1-rm/id1274191954/reviews) | **[4.8 (126 ratings)](https://appshunter.io/ios/app/1rm-calculator/id1566775126/reviews)** |
| Number of ratings | **1.1K** | 126 |
| Positive reviews | 39.4% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 4 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 47 MB | 28 MB |
| Requires iOS | **10.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 9+ | 4+ |
| Developer | [Bodybuilding.com](https://appshunter.io/developer/380871023) | [Yuri Koshiishi](https://appshunter.io/developer/1566775128) |

## What reviewers say

### 1

[App page](https://appshunter.io/ios/app/1-rm/id1274191954)

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:** macOS Compatibility, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 🚀 Great for calculating reps
- 👍 Good, simple app
- 👍 Quick easy to use tool

**What reviewers complain about**

- 🐛 Numbers won't work
- 🐛 Single digit reps only
- 🐛 Links to articles not working
- 🐛 Keeps billing user
- 🐛 Inability to filter exercise history

**Reported bugs**

- Numbers won't work
- Single digit reps only
- Links to articles not working
- Keeps billing user
- Inability to filter exercise history

**Requested features**

- 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


### 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 1 free?

1 costs $1.99, with no in-app purchases.

### Is 1RM Calculator free?

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

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

1RM Calculator is rated higher. 1 averages 4.8 out of 5 from 1.1K ratings, while 1RM Calculator averages 4.8 from 126 ratings.

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

Neither 1 nor 1RM Calculator shows ads.

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

1 ships an update every 3 months, and 1RM Calculator every 4 months. Most recently, 1 was updated on October 29, 2026 and 1RM Calculator on October 25, 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.*