# CDA vs 卵石实习生

The clearest difference is rating: 卵石实习生 at 4.8 against CDA's 3.0. 卵石实习生 also leads on in-app purchases (none vs 6) and ratings volume (4 vs 1). CDA's advantage is device support (3 vs 1) and iOS requirement (11.0 vs 16.0). On price, update cadence and ads there is nothing between them.

Both are free to download. CDA sells 6 one-off in-app purchases. 卵石实习生 asks for nothing beyond the download.

卵石实习生 holds the better App Store score, 4.8 against 3.0. Both are backed by a comparable volume of ratings — 1 and 4 respectively.

CDA ships an update monthly, 卵石实习生 every 3 weeks. The most recent releases landed on June 25, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | CDA | 卵石实习生 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.0 (1 ratings)](https://appshunter.io/ios/app/cda/id1069225260/reviews) | **[4.8 (4 ratings)](https://appshunter.io/ios/app/id6447495327/reviews)** |
| Number of ratings | 1 | **4** |
| Positive reviews | — | 85.7% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 198 MB | 164 MB |
| Requires iOS | **11.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Beijing Guofuruhe Networking Technology Co., Ltd](https://appshunter.io/developer/547894322) | [世荣 肖](https://appshunter.io/developer/1306461311) |

## 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 |


### 卵石实习生

[App page](https://appshunter.io/ios/app/id6447495327)

**In-app purchases:** none


## Frequently asked questions

### Is CDA free?

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

### Is 卵石实习生 free?

卵石实习生 is free to download, with no in-app purchases.

### Which has better reviews, CDA or 卵石实习生?

卵石实习生 is rated higher. CDA averages 3.0 out of 5 from 1 ratings, while 卵石实习生 averages 4.8 from 4 ratings.

### Do CDA or 卵石实习生 have ads?

Neither CDA nor 卵石实习生 shows ads.

### Which is updated more often, CDA or 卵石实习生?

CDA ships an update monthly, and 卵石实习生 every 3 weeks. Most recently, CDA was updated on June 25, 2026 and 卵石实习生 on September 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.*