# 生物记 vs Hardness

The clearest difference is price: 生物记 at Free against Hardness's $1.99. 生物记 also leads on update cadence (every 3 months vs every 60 months). Hardness's advantage is iOS requirement (12.0 vs 15.6). On ads, in-app purchases and device support there is nothing between them.

生物记 is free to download; Hardness costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

生物记 ships an update every 3 months, Hardness every 60 months. The most recent releases landed on October 26, 2026 and March 14, 2026 respectively.

## The numbers

| Metric | 生物记 | Hardness |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 60 months |
| Size | 94 MB | 264 MB |
| Requires iOS | 15.6 | **12.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [北京微普科创科技有限公司](https://appshunter.io/developer/1073525273) | [VIRTUAL FILAMENTS PRIVATE LIMITED](https://appshunter.io/developer/1474217212) |

## What reviewers say

### 生物记

[App page](https://appshunter.io/ios/app/id1468297340)

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

**In-app purchases:** none


### Hardness

[App page](https://appshunter.io/ios/app/hardness/id1544437004)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 生物记 free?

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

### Is Hardness free?

Hardness costs $1.99, with no in-app purchases.

### Do 生物记 or Hardness have ads?

Neither 生物记 nor Hardness shows ads.

### Which is updated more often, 生物记 or Hardness?

生物记 ships an update every 3 months, and Hardness every 60 months. Most recently, 生物记 was updated on October 26, 2026 and Hardness on March 14, 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.*