# KnowTox vs Biostacks

The clearest difference is iOS requirement: KnowTox at 13.0 against Biostacks's 15.1. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. KnowTox sells 5 in-app purchases, starting at $3.99 per month and Biostacks sells 2 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

KnowTox ships an update weekly, Biostacks every 2 weeks. The most recent releases landed on October 26, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | KnowTox | Biostacks |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Every 2 weeks |
| Monetization | — | Freemium |
| Size | 105 MB | 68 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 17+ | 17+ |
| Developer | [Angel Arias Gonzalez](https://appshunter.io/developer/1392665681) | [Hmujo LLC](https://appshunter.io/developer/1895266544) |

## What reviewers say

### KnowTox

[App page](https://appshunter.io/ios/app/knowtox-ingredient-scanner/id6758156657)

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Basic | $3.99 | per month |
| Premium | $9.99 | per month |
| Basic Annual | $31.99 | per year |
| Premium Annual | $79.99 | per year |
| Extra 10 | $0.99 | one-time |


### Biostacks

[App page](https://appshunter.io/ios/app/biostacks-supplement-tracker/id6763328808)

Easily manage your supplement intake with barcode scanning, AI assistance, and detailed insights. Track routines, monitor nutrient coverage, and analyze your stack's effectiveness and cost. Prioritizes user privacy with offline functionality and optional iCloud sync.

**Highlights:** Barcode scanning for supplement library, AI-powered supplement routine analysis, Customizable daily and cycle schedules, StackScore for routine quality, Potential interaction warnings, RDA coverage and nutrient overlap analysis, Mood, energy, and sleep trend tracking

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Biostacks Pro - Monthly | $3.99 | per month |
| Biostacks Pro - Annual | $24.99 | per year |


## Frequently asked questions

### Is KnowTox free?

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

### Is Biostacks free?

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

### Do KnowTox or Biostacks have ads?

Neither KnowTox nor Biostacks shows ads.

### Which is updated more often, KnowTox or Biostacks?

KnowTox ships an update weekly, and Biostacks every 2 weeks. Most recently, KnowTox was updated on October 26, 2026 and Biostacks on October 24, 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.*