# 1RM Calculator vs Lifter Trainer

The clearest difference is in-app purchases: Lifter Trainer at none against 1RM Calculator's 3. Lifter Trainer also leads on update cadence (weekly vs every 4 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. 1RM Calculator sells 3 in-app purchases, starting at $1.99 per month. Lifter Trainer asks for nothing beyond the download.

1RM Calculator ships an update every 4 months, Lifter Trainer weekly. The most recent releases landed on October 30, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | 1RM Calculator | Lifter Trainer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (128 ratings)](https://appshunter.io/ios/app/1rm-calculator/id1566775126/reviews)** | — |
| Number of ratings | **128** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 months | **Weekly** |
| Monetization | Free with in-app purchases | — |
| Size | 28 MB | 18 MB |
| Requires iOS | **15.0** | 15.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Yuri Koshiishi](https://appshunter.io/developer/1566775128) | [Kevin Pena](https://appshunter.io/developer/1722155601) |

## What reviewers say

### 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 |


### Lifter Trainer

[App page](https://appshunter.io/ios/app/lifter-trainer/id6752795352)

**In-app purchases:** none


## Frequently asked questions

### Is 1RM Calculator free?

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

### Is Lifter Trainer free?

Lifter Trainer is free to download, with no in-app purchases.

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

Neither 1RM Calculator nor Lifter Trainer shows ads.

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

1RM Calculator ships an update every 4 months, and Lifter Trainer weekly. Most recently, 1RM Calculator was updated on October 30, 2026 and Lifter Trainer 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.*