# Surprised!ReactionTimeChecker? vs PK

The clearest difference is price: Surprised!ReactionTimeChecker? at Free against PK's $99.99. Surprised!ReactionTimeChecker? also leads on device support (3 vs 1). PK's advantage is ads (none vs shown) and update cadence (every 2 months vs every 6 months). On review sentiment, in-app purchases and iOS requirement there is nothing between them.

Surprised!ReactionTimeChecker? is free to download; PK costs $99.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Surprised!ReactionTimeChecker? ships an update every 6 months, PK every 2 months. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Surprised!ReactionTimeChecker? | PK |
| --- | --- | --- |
| Price | **Free** | $99.99 |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/pk-ink-pro/id6717616357/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 6 months | **Every 2 months** |
| Monetization | **Ad-supported** | Paid |
| Size | 24 MB | 16 MB |
| Requires iOS | **15.6** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 12+ | 4+ |
| Developer | [NSC, K.K.](https://appshunter.io/developer/501890400) | [Nelson Suarez Arteaga](https://appshunter.io/developer/1692733605) |

## 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


### PK

[App page](https://appshunter.io/ios/app/pk-ink-pro/id6717616357)

Create a paranormal illusion by magically moving permanent ink on your mobile screen. Spectators choose ink placement and color, and you control the movement remotely or with hand gestures. Offers multiple finales and can integrate with other magic apps for advanced effects.

**Highlights:** Spectator-chosen ink placement, Customizable marker colors and designs, Remote control and hand-gesture recognition, Multiple powerful finales, Offline functionality, Integration with other magic apps

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

**In-app purchases:** none


## Frequently asked questions

### Is Surprised!ReactionTimeChecker? free?

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

### Is PK free?

PK costs $99.99, with no in-app purchases.

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

Surprised!ReactionTimeChecker? shows ads; PK does not.

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

Surprised!ReactionTimeChecker? ships an update every 6 months, and PK every 2 months. Most recently, Surprised!ReactionTimeChecker? was updated on November 1, 2026 and PK on November 3, 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.*