# KLASS vs Surbiton FitBox

KLASS and Surbiton FitBox are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

KLASS ships an update every 5 months, Surbiton FitBox every 3 months. The most recent releases landed on September 24, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | KLASS | Surbiton FitBox |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 3 months** |
| Size | 56 MB | 57 MB |
| Requires iOS | 15.1 | **14.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Momence, Inc.](https://appshunter.io/developer/1577856011) | [TeamUp Sports](https://appshunter.io/developer/1449504626) |

## What reviewers say

### KLASS

[App page](https://appshunter.io/ios/app/klass/id6746098241)

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

**In-app purchases:** none


### Surbiton FitBox

[App page](https://appshunter.io/ios/app/surbiton-fitbox/id6757914063)

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

**In-app purchases:** none


## Frequently asked questions

### Is KLASS free?

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

### Is Surbiton FitBox free?

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

### Do KLASS or Surbiton FitBox have ads?

Neither KLASS nor Surbiton FitBox shows ads.

### Which is updated more often, KLASS or Surbiton FitBox?

KLASS ships an update every 5 months, and Surbiton FitBox every 3 months. Most recently, KLASS was updated on September 24, 2026 and Surbiton FitBox on September 15, 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.*