# Surprised!ReactionTimeChecker? vs Stubstack

The clearest difference is in-app purchases: Surprised!ReactionTimeChecker? at none against Stubstack's 2. Stubstack's advantage is ads (none vs shown) and update cadence (weekly vs every 6 months). On price and device support there is nothing between them.

Both are free to download. Stubstack sells 2 in-app purchases, starting at $4.99 per month. Surprised!ReactionTimeChecker? asks for nothing beyond the download.

Surprised!ReactionTimeChecker? ships an update every 6 months, Stubstack weekly. The most recent releases landed on October 2, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Surprised!ReactionTimeChecker? | Stubstack |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 6 months | **Weekly** |
| Monetization | Ad-supported | — |
| Size | 24 MB | 107 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [NSC, K.K.](https://appshunter.io/developer/501890400) | [sato takeru](https://appshunter.io/developer/1611002282) |

## 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


### Stubstack

[App page](https://appshunter.io/ios/app/stubstack/id6759214406)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Plan | $4.99 | per month |
| Pro Plan | $49.99 | per year |


## Frequently asked questions

### Is Surprised!ReactionTimeChecker? free?

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

### Is Stubstack free?

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

### Do Surprised!ReactionTimeChecker? or Stubstack have ads?

Surprised!ReactionTimeChecker? shows ads; Stubstack does not.

### Which is updated more often, Surprised!ReactionTimeChecker? or Stubstack?

Surprised!ReactionTimeChecker? ships an update every 6 months, and Stubstack weekly. Most recently, Surprised!ReactionTimeChecker? was updated on October 2, 2026 and Stubstack on October 1, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*