# KChem vs Thoth

The clearest difference is in-app purchases: Thoth at none against KChem's 1. KChem's advantage is update cadence (daily vs every 3 days). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. KChem sells 1 in-app purchase, starting at $2.49 per month. Thoth asks for nothing beyond the download.

KChem ships an update daily, Thoth every 3 days. The most recent releases landed on October 6, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | KChem | Thoth |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 75.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Daily** | Every 3 days |
| Monetization | Freemium | — |
| Size | 12 MB | 67 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Akihiko Kitamura](https://appshunter.io/developer/1585792497) | [THOTH Inc.](https://appshunter.io/developer/6783651004) |

## What reviewers say

### KChem

[App page](https://appshunter.io/ios/app/kchem/id1601032155)

This app helps high school students memorize organic chemistry concepts efficiently. It features a memorization mode for easy output, comprehensive coverage of high school organic chemistry topics, and clear explanations. Some advanced content requires a subscription.

**Highlights:** Memorization mode for active recall, Comprehensive high school organic chemistry content, Clear and easy-to-understand explanations, Subscription for advanced topics

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| プレミアム | $2.49 | per month |


### Thoth

[App page](https://appshunter.io/ios/app/thoth/id6783651002)

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

**In-app purchases:** none


## Frequently asked questions

### Is KChem free?

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

### Is Thoth free?

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

### Do KChem or Thoth have ads?

Neither KChem nor Thoth shows ads.

### Which is updated more often, KChem or Thoth?

KChem ships an update daily, and Thoth every 3 days. Most recently, KChem was updated on October 6, 2026 and Thoth on October 5, 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.*