# BIO WAR vs Knightfire

The clearest difference is in-app purchases: BIO WAR at none against Knightfire's 1. BIO WAR also leads on update cadence (every 2 days vs weekly). Knightfire's advantage is iOS requirement (13.4 vs 18.5). On price, ads and device support there is nothing between them.

Both are free to download. Knightfire sells 1 one-off in-app purchase. BIO WAR asks for nothing beyond the download.

BIO WAR ships an update every 2 days, Knightfire weekly. Both last shipped on October 28, 2026.

## The numbers

| Metric | BIO WAR | Knightfire |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 days** | Weekly |
| Size | 12 MB | 116 MB |
| Requires iOS | 18.5 | **13.4** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Yonghun Cho](https://appshunter.io/developer/1827369182) | [Roberto Garcia](https://appshunter.io/developer/1859499741) |

## What reviewers say

### BIO WAR

[App page](https://appshunter.io/ios/app/bio-war/id6754510091)

**Features:** macOS Compatibility

**In-app purchases:** none


### Knightfire

[App page](https://appshunter.io/ios/app/knightfire-strategy-chess/id6756245884)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Knightfire Premium | $2.99 | one-time |


## Frequently asked questions

### Is BIO WAR free?

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

### Is Knightfire free?

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

### Do BIO WAR or Knightfire have ads?

Neither BIO WAR nor Knightfire shows ads.

### Which is updated more often, BIO WAR or Knightfire?

BIO WAR ships an update every 2 days, and Knightfire weekly. Most recently, BIO WAR was updated on October 28, 2026 and Knightfire 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.*