# 1RM Max Calculator vs SBD

The clearest difference is rating: SBD at 5.0 against 1RM Max Calculator's 4.2. SBD also leads on in-app purchases (none vs 3) and update cadence (every 2 days vs every 6 weeks). 1RM Max Calculator's advantage is ratings volume (22 vs 1). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. 1RM Max Calculator sells 3 one-off in-app purchases. SBD asks for nothing beyond the download.

SBD holds the better App Store score, 5.0 against 4.2. That said, the two scores are not equally well evidenced: 1RM Max Calculator has 22 ratings behind it against 1, so its average is the more settled of the two.

1RM Max Calculator ships an update every 6 weeks, SBD every 2 days. The most recent releases landed on November 2, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | 1RM Max Calculator | SBD |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.2 (22 ratings)](https://appshunter.io/ios/app/1rm-max-calculator/id1110502852/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/sbd-big3/id6759197117/reviews)** |
| Number of ratings | **22** | 1 |
| Positive reviews | 70.4% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 2 days** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 10 MB | 6 MB |
| Requires iOS | 16.6 | **16.0** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Kazumasa Shimomura](https://appshunter.io/developer/1110502851) | [Fuchigami Sohta](https://appshunter.io/developer/1871797640) |

## What reviewers say

### 1RM Max Calculator

[App page](https://appshunter.io/ios/app/1rm-max-calculator/id1110502852)

Instantly calculate your one-rep max (1RM) for bench press, squat, and deadlift using 7 scientific formulas. Track your progress with intuitive charts and calendar records. Ideal for athletes and lifters aiming for more scientific and effective training.

**Highlights:** 7 scientific 1RM calculation formulas, Supports bench press, squat, and deadlift, Progress tracking and data visualization, Calendar for daily record management, One-tap data saving, Offline functionality

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Calculator for deadlift | $2.99 | one-time |
| Calculator for squat | $2.99 | one-time |
| Ad Blocker | $2.99 | one-time |


### SBD

[App page](https://appshunter.io/ios/app/sbd-big3/id6759197117)

This app focuses on tracking your progress for the three main powerlifting exercises: squat, bench press, and deadlift. It automatically calculates estimated 1RM, hypertrophy range, and volume, and logs personal bests. You can also record daily conditions, trained muscles, and notes for supplementary workouts.

**Highlights:** Track squat, bench press, and deadlift, Automatic estimated 1RM calculation, Automatic personal best logging, Record daily condition and notes, View progress with calendar and graphs, Focus on BIG3 exercises

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 1RM Max Calculator free?

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

### Is SBD free?

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

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

SBD is rated higher. 1RM Max Calculator averages 4.2 out of 5 from 22 ratings, while SBD averages 5.0 from 1 ratings.

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

Neither 1RM Max Calculator nor SBD shows ads.

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

1RM Max Calculator ships an update every 6 weeks, and SBD every 2 days. Most recently, 1RM Max Calculator was updated on November 2, 2026 and SBD on November 5, 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.*