# Dohaa! vs Chem Formula Sheet by CS team

The clearest difference is ads: Dohaa! at none against Chem Formula Sheet by CS team's shown. Dohaa! also leads on update cadence (every 4 days vs every 6 months) and iOS requirement (13.0 vs 18.4). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Dohaa! sells 2 in-app purchases, starting at $5.99 per month and Chem Formula Sheet by CS team sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Dohaa! ships an update every 4 days, Chem Formula Sheet by CS team every 6 months. The most recent releases landed on November 3, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Dohaa! | Chem Formula Sheet by CS team |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/dohaa/id6450774958/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 83.3% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 4 days** | Every 6 months |
| Monetization | Freemium | — |
| Size | 158 MB | 11 MB |
| Requires iOS | **13.0** | 18.4 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Beyturk Kirezlik](https://appshunter.io/developer/1694892860) | [ChatStick Company Limited](https://appshunter.io/developer/1165816085) |

## What reviewers say

### Dohaa!

[App page](https://appshunter.io/ios/app/dohaa/id6450774958)

Master new words with interactive lessons and an extensive word bank. Tailor your learning with personalized features, track progress, and explore vocabulary in multiple languages. Enjoy a user-friendly interface for an engaging language skill enhancement.

**Highlights:** Interactive vocabulary lessons, Extensive word bank with definitions and audio, Personalized learning paths, Progress tracking and statistics, Support for multiple languages, User-friendly interface

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Premium | $5.99 | per month |
| Yearly Subscription | $19.99 | per year |


### Chem Formula Sheet by CS team

[App page](https://appshunter.io/ios/app/chem-formula-sheet-by-cs-team/id6753220949)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock All Feature | $1.99 | one-time |


## Frequently asked questions

### Is Dohaa! free?

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

### Is Chem Formula Sheet by CS team free?

Chem Formula Sheet by CS team is free to download, with in-app purchases available.

### Do Dohaa! or Chem Formula Sheet by CS team have ads?

Chem Formula Sheet by CS team shows ads; Dohaa! does not.

### Which is updated more often, Dohaa! or Chem Formula Sheet by CS team?

Dohaa! ships an update every 4 days, and Chem Formula Sheet by CS team every 6 months. Most recently, Dohaa! was updated on November 3, 2026 and Chem Formula Sheet by CS team on November 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.*