# KBStronger Kettlebell Method vs Bio Optimizer

The clearest difference is in-app purchases: KBStronger Kettlebell Method at none against Bio Optimizer's 2. KBStronger Kettlebell Method also leads on iOS requirement (15.0 vs 17.0). Bio Optimizer's advantage is update cadence (every 4 days vs monthly). On price, ads and device support there is nothing between them.

Both are free to download. Bio Optimizer sells 2 in-app purchases, starting at $19.99 per month. KBStronger Kettlebell Method asks for nothing beyond the download.

KBStronger Kettlebell Method ships an update monthly, Bio Optimizer every 4 days. Both last shipped on October 28, 2026.

## The numbers

| Metric | KBStronger Kettlebell Method | Bio Optimizer |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 4 days** |
| Size | 133 MB | 76 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 12+ | 12+ |
| Developer | [Kettlebell Kickboxing Canada LTD](https://appshunter.io/developer/1616908897) | [YOU SUNG CHYUNG](https://appshunter.io/developer/1881798464) |

## What reviewers say

### KBStronger Kettlebell Method

[App page](https://appshunter.io/ios/app/kbstronger-kettlebell-method/id6751393850)

**Features:** macOS Compatibility

**In-app purchases:** none


### Bio Optimizer

[App page](https://appshunter.io/ios/app/bio-optimizer/id6759941870)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Premium | $19.99 | per month |
| Annual Premium | $119.00 | per year |


## Frequently asked questions

### Is KBStronger Kettlebell Method free?

KBStronger Kettlebell Method is free to download, with no in-app purchases.

### Is Bio Optimizer free?

Bio Optimizer is free to download, with in-app purchases available.

### Do KBStronger Kettlebell Method or Bio Optimizer have ads?

Neither KBStronger Kettlebell Method nor Bio Optimizer shows ads.

### Which is updated more often, KBStronger Kettlebell Method or Bio Optimizer?

KBStronger Kettlebell Method ships an update monthly, and Bio Optimizer every 4 days. Most recently, KBStronger Kettlebell Method was updated on October 28, 2026 and Bio Optimizer on October 28, 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.*