# Bulb vs CHSK

The clearest difference is in-app purchases: CHSK at none against Bulb's 3. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Bulb sells 3 in-app purchases, starting at $2.99 per 7 days. CHSK asks for nothing beyond the download.

Bulb ships an update every 5 days, CHSK every 3 days. The most recent releases landed on October 15, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Bulb | CHSK |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 days | **Every 3 days** |
| Monetization | — | Free |
| Size | 40 MB | 102 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 17+ | 9+ |
| Developer | [Danis Gaiazov](https://appshunter.io/developer/1798511426) | [Wuxi Wudao Matrix Information Technology Co., Ltd](https://appshunter.io/developer/1884923310) |

## What reviewers say

### Bulb

[App page](https://appshunter.io/ios/app/bulb-read-to-learn-languages/id6742458314)

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Weekly | $2.99 | per 7 days |
| Premium Monthly | $6.99 | per month |
| Premium Annual | $49.99 | per year |


### CHSK

[App page](https://appshunter.io/ios/app/chsk/id6772783157)

Prepare for HSK Chinese proficiency tests from levels 1 to 6 with mock exams, targeted practice modules, and vocabulary flashcards. Engage in word matching games and access a comprehensive grammar list with search functionality.

**Highlights:** Mock HSK exams with timer, Targeted listening, reading, writing practice, Bilingual vocabulary flashcards, Timed word matching game, Grammar points index and search

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

**In-app purchases:** none


## Frequently asked questions

### Is Bulb free?

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

### Is CHSK free?

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

### Do Bulb or CHSK have ads?

Neither Bulb nor CHSK shows ads.

### Which is updated more often, Bulb or CHSK?

Bulb ships an update every 5 days, and CHSK every 3 days. Most recently, Bulb was updated on October 15, 2026 and CHSK on October 25, 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.*