# Bio vs Pi

The clearest difference is rating: Bio at 5.0 against Pi's 1.0. Pi's advantage is in-app purchases (none vs 3) and iOS requirement (13.0 vs 17.0). On price, ratings volume, update cadence and ads there is nothing between them.

Both are free to download. Bio sells 3 in-app purchases, starting at $2.99 per month. Pi asks for nothing beyond the download.

Bio holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 2 and 2 respectively.

Bio ships an update every 2 weeks, Pi every 11 days. The most recent releases landed on November 4, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Bio | Pi |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/bio-calculator/id6498629520/reviews)** | [1.0 (2 ratings)](https://appshunter.io/ios/app/pi-lab/id6633428384/reviews) |
| Number of ratings | 2 | 2 |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 11 days** |
| Monetization | Freemium | **Free** |
| Size | 51 MB | 68 MB |
| Requires iOS | 17.0 | **13.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [杰 吴](https://appshunter.io/developer/1729187814) | [湖北鄂仪国际贸易有限公司](https://appshunter.io/developer/1762586431) |

## What reviewers say

### Bio

[App page](https://appshunter.io/ios/app/bio-calculator/id6498629520)

This scientific assistant provides researchers and students with essential tools for everyday lab calculations. It offers modules for protein and nucleic acid conversions, solution preparation, microbiology, and buffer recipes. Streamline your laboratory workflow with precise and efficient scientific computations.

**Highlights:** Protein & Peptide Conversion, Nucleic Acid & Genomics Toolkit, Biochemistry & Solution Preparation, Microbiology & Cell Culture Tools, Buffer & Solution Preparation Library, Native iOS Performance

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Plan | $2.99 | per month |
| Yearly Plan | $19.99 | per year |
| Lifetime member | $44.99 | one-time |


### Pi

[App page](https://appshunter.io/ios/app/pi-lab/id6633428384)

This utility app focuses on bug fixes and performance improvements. It aims to provide a more stable and reliable user experience by addressing known issues. The latest update ensures smoother operation.

**Highlights:** Bug fixes, Performance improvements, Enhanced stability, Smoother operation

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

**In-app purchases:** none


## Frequently asked questions

### Is Bio free?

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

### Is Pi free?

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

### Which has better reviews, Bio or Pi?

Bio is rated higher. Bio averages 5.0 out of 5 from 2 ratings, while Pi averages 1.0 from 2 ratings.

### Do Bio or Pi have ads?

Neither Bio nor Pi shows ads.

### Which is updated more often, Bio or Pi?

Bio ships an update every 2 weeks, and Pi every 11 days. Most recently, Bio was updated on November 4, 2026 and Pi on October 30, 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.*