# 社会語シグナル vs シャドディク

The clearest difference is in-app purchases: 社会語シグナル at none against シャドディク's 1. シャドディク's advantage is update cadence (daily vs every 7 months) and iOS requirement (13.0 vs 18.0). On price, ads and device support there is nothing between them.

Both are free to download. シャドディク sells 1 in-app purchase, starting at $9.99 per month. 社会語シグナル asks for nothing beyond the download.

社会語シグナル ships an update every 7 months, シャドディク daily. The most recent releases landed on August 26, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | 社会語シグナル | シャドディク |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 7 months | **Daily** |
| Size | 5 MB | 108 MB |
| Requires iOS | 18.0 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [INCICT](https://appshunter.io/developer/1771525934) | [StudyPeaks](https://appshunter.io/developer/901134689) |

## What reviewers say

### 社会語シグナル

[App page](https://appshunter.io/ios/app/id6742773144)

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

**In-app purchases:** none


### シャドディク

[App page](https://appshunter.io/ios/app/toeic/id6749894258)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| プレミアムプラン | $9.99 | per month |


## Frequently asked questions

### Is 社会語シグナル free?

社会語シグナル is free to download, with no in-app purchases.

### Is シャドディク free?

シャドディク is free to download, with in-app purchases available.

### Do 社会語シグナル or シャドディク have ads?

Neither 社会語シグナル nor シャドディク shows ads.

### Which is updated more often, 社会語シグナル or シャドディク?

社会語シグナル ships an update every 7 months, and シャドディク daily. Most recently, 社会語シグナル was updated on August 26, 2026 and シャドディク on September 19, 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.*