# Surprised!ReactionTimeChecker? vs びっくりアプリ

The clearest difference is price: Surprised!ReactionTimeChecker? at Free against びっくりアプリ's $1.99. On review sentiment, update cadence, ads and in-app purchases there is nothing between them.

Surprised!ReactionTimeChecker? is free to download; びっくりアプリ costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Surprised!ReactionTimeChecker? ships an update every 6 months, びっくりアプリ every 4 months. The most recent releases landed on June 1, 2026 and June 19, 2026 respectively.

## The numbers

| Metric | Surprised!ReactionTimeChecker? | びっくりアプリ |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | — | **[1.0 (1 ratings)](https://appshunter.io/ios/app/id1508282901/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | Every 6 months | **Every 4 months** |
| Monetization | Ad-supported | — |
| Size | 24 MB | 20 MB |
| Requires iOS | 15.6 | **14.2** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 9+ |
| Developer | [NSC, K.K.](https://appshunter.io/developer/501890400) | [Yusaku Fujita](https://appshunter.io/developer/1506740830) |

## What reviewers say

### Surprised!ReactionTimeChecker?

[App page](https://appshunter.io/ios/app/surprisedreactiontimechecker/id553393907)

This app captures photos of users when they are startled by sudden fear images. It's designed for playful pranks to surprise friends and family, documenting their genuine reactions. Note that it utilizes sound effects even in silent mode and requires camera permissions.

**Highlights:** Sudden fear image display, Captures user's surprised photo, Sound effects in silent mode, Requires camera permission, Prank and surprise friends

**In-app purchases:** none


### びっくりアプリ

[App page](https://appshunter.io/ios/app/id1508282901)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Surprised!ReactionTimeChecker? free?

Surprised!ReactionTimeChecker? is free to download, with no in-app purchases.

### Is びっくりアプリ free?

びっくりアプリ costs $1.99, with no in-app purchases.

### Do Surprised!ReactionTimeChecker? or びっくりアプリ have ads?

Both Surprised!ReactionTimeChecker? and びっくりアプリ show ads.

### Which is updated more often, Surprised!ReactionTimeChecker? or びっくりアプリ?

Surprised!ReactionTimeChecker? ships an update every 6 months, and びっくりアプリ every 4 months. Most recently, Surprised!ReactionTimeChecker? was updated on June 1, 2026 and びっくりアプリ on June 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.*