# CDA vs 三节课

The clearest difference is iOS requirement: CDA at 11.0 against 三节课's 13.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. CDA sells 6 one-off in-app purchases and 三节课 sells 6 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

CDA ships an update monthly, 三节课 every 5 weeks. The most recent releases landed on October 2, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | CDA | 三节课 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (1 ratings)](https://appshunter.io/ios/app/cda/id1069225260/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Monthly** | Every 5 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 198 MB | 60 MB |
| Requires iOS | **11.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Beijing Guofuruhe Networking Technology Co., Ltd](https://appshunter.io/developer/547894322) | [三节课](https://appshunter.io/developer/1048898450) |

## What reviewers say

### CDA

[App page](https://appshunter.io/ios/app/cda/id1069225260)

This app provides a comprehensive learning platform for aspiring data analysts. It offers official study materials, practice questions, expert interviews, and video courses to help users prepare for and pass the CDA certification exam. Join a community of learners to share insights and track your progress.

**Highlights:** Official CDA study materials, Extensive question bank with practice modes, Expert interviews and insights, Video lectures and courses, Exam news and updates, Community forums for learners

**Features:** macOS Compatibility

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 6 coin | $0.99 | one-time |
| 18 coin | $2.99 | one-time |
| 68 coin | $9.99 | one-time |
| 128 coin | $19.99 | one-time |
| 268 coin | $41.99 | one-time |
| 618 coin | $94.99 | one-time |


### 三节课

[App page](https://appshunter.io/ios/app/id1455294987)

**Features:** macOS Compatibility

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 钱包充值 | $15.99 | one-time |
| 钱包充值 | $29.99 | one-time |
| 钱包充值 | $46.99 | one-time |
| 钱包充值 | $94.99 | one-time |
| 钱包充值 | $139.99 | one-time |
| 钱包充值 | $179.99 | one-time |


## Frequently asked questions

### Is CDA free?

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

### Is 三节课 free?

三节课 is free to download, with in-app purchases available.

### Do CDA or 三节课 have ads?

Neither CDA nor 三节课 shows ads.

### Which is updated more often, CDA or 三节课?

CDA ships an update monthly, and 三节课 every 5 weeks. Most recently, CDA was updated on October 2, 2026 and 三节课 on October 10, 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.*