# SDC vs 解題吧

The clearest difference is in-app purchases: SDC at none against 解題吧's 3. 解題吧's advantage is update cadence (monthly vs every 2 months) and iOS requirement (13.0 vs 15.0). On price, ads and device support there is nothing between them.

Both are free to download. 解題吧 sells 3 in-app purchases, starting at $14.99 per month. SDC asks for nothing beyond the download.

SDC ships an update every 2 months, 解題吧 monthly. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | SDC | 解題吧 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/id6737217673/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 76.5% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Monthly** |
| Monetization | — | Free with in-app purchases |
| Size | 8 MB | 79 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Chung-Ming Huang](https://appshunter.io/developer/1003733181) | [JT Bar Infotech, Ltd.](https://appshunter.io/developer/1775355003) |

## What reviewers say

### SDC

[App page](https://appshunter.io/ios/app/sdc-deh-lite/id1552530246)

**Features:** macOS Compatibility

**In-app purchases:** none


### 解題吧

[App page](https://appshunter.io/ios/app/id6737217673)

Practice English and Japanese language proficiency tests with simulated exams and vocabulary quizzes. Get detailed explanations, track your progress, and engage with a community for language learning support.

**Highlights:** Daily vocabulary quizzes, TOEIC simulated practice tests, JLPT simulated practice tests, Mini TOEIC/JLPT practice tests, Community discussion forum, Live tutor consultation

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 解題吧 (VIP) 月會籍 | $14.99 | per month |
| 解題吧 (VIP) 季會籍 | $39.99 | per 3 months |
| 解題吧 (VIP) 年會籍 | $99.99 | per year |


## Frequently asked questions

### Is SDC free?

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

### Is 解題吧 free?

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

### Do SDC or 解題吧 have ads?

Neither SDC nor 解題吧 shows ads.

### Which is updated more often, SDC or 解題吧?

SDC ships an update every 2 months, and 解題吧 monthly. Most recently, SDC was updated on November 3, 2026 and 解題吧 on October 30, 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.*