# Halitosis vs Know & Grow

The clearest difference is price: Know & Grow at Free against Halitosis's $1.99. Know & Grow also leads on update cadence (every 4 days vs every 5 months). Halitosis's advantage is iOS requirement (9.0 vs 15.1). On ads, in-app purchases and device support there is nothing between them.

Know & Grow is free to download; Halitosis costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Halitosis ships an update every 5 months, Know & Grow every 4 days. The most recent releases landed on October 24, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | Halitosis | Know & Grow |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 4 days** |
| Size | 35 MB | 28 MB |
| Requires iOS | **9.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 12+ | 12+ |
| Developer | [Andreas Filippi](https://appshunter.io/developer/1321553968) | [Charite – Universitatsmedizin Berlin](https://appshunter.io/developer/691944420) |

## What reviewers say

### Halitosis

[App page](https://appshunter.io/ios/app/halitosis/id1321553969)

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

**In-app purchases:** none


### Know & Grow

[App page](https://appshunter.io/ios/app/know-and-grow/id6747246533)

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

**In-app purchases:** none


## Frequently asked questions

### Is Halitosis free?

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

### Is Know & Grow free?

Know & Grow is free to download, with no in-app purchases.

### Do Halitosis or Know & Grow have ads?

Neither Halitosis nor Know & Grow shows ads.

### Which is updated more often, Halitosis or Know & Grow?

Halitosis ships an update every 5 months, and Know & Grow every 4 days. Most recently, Halitosis was updated on October 24, 2026 and Know & Grow on October 21, 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.*