# Simple Workout Tracker vs Kalbox

The clearest difference is in-app purchases: Kalbox at none against Simple Workout Tracker's 2. Kalbox also leads on ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

Both are free to download. Simple Workout Tracker sells 2 in-app purchases, starting at $2.99 per month. Kalbox asks for nothing beyond the download.

Simple Workout Tracker ships an update fortnightly, Kalbox every 2 weeks. The most recent releases landed on October 15, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | Simple Workout Tracker | Kalbox |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/simple-workout-tracker-muscly/id6446846782/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 85.7% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Fortnightly | **Every 2 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 66 MB | 5 MB |
| Requires iOS | 18.6 | **17.0** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [DAIKI YUASA](https://appshunter.io/developer/1632691655) | [KALBI LIMITED LIABILITY COMPANY](https://appshunter.io/developer/1551784600) |

## What reviewers say

### Simple Workout Tracker

[App page](https://appshunter.io/ios/app/simple-workout-tracker-muscly/id6446846782)

This strength training log helps gym enthusiasts and bodybuilders track workouts with ease. It offers automatic 1RM calculations, advanced set tracking for supersets and tri-sets, and detailed progress graphs to measure gains and crush fitness goals.

**Highlights:** Automatic 1RM calculation, Advanced set tracking (supersets, tri-sets), Comprehensive progress tracking, Color-coded workout calendar, In-depth analytics and graphs, Dark mode and rest timer

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| MUSCLY PREMIUM | $2.99 | per month |
| Premium Plan | $24.99 | per year |


### Kalbox

[App page](https://appshunter.io/ios/app/kalbox/id6767986664)

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

**In-app purchases:** none


## Frequently asked questions

### Is Simple Workout Tracker free?

Simple Workout Tracker is free to download, with in-app purchases available.

### Is Kalbox free?

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

### Do Simple Workout Tracker or Kalbox have ads?

Simple Workout Tracker shows ads; Kalbox does not.

### Which is updated more often, Simple Workout Tracker or Kalbox?

Simple Workout Tracker ships an update fortnightly, and Kalbox every 2 weeks. Most recently, Simple Workout Tracker was updated on October 15, 2026 and Kalbox on October 21, 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.*