# dnCalc vs Reaction Speed Test Pro

The clearest difference is price: dnCalc at Free against Reaction Speed Test Pro's $0.99. dnCalc also leads on iOS requirement (11.0 vs 15.0). Reaction Speed Test Pro's advantage is update cadence (every 2 days vs fortnightly). On ads, in-app purchases and device support there is nothing between them.

dnCalc is free to download; Reaction Speed Test Pro costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

dnCalc ships an update fortnightly, Reaction Speed Test Pro every 2 days. The most recent releases landed on October 13, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | dnCalc | Reaction Speed Test Pro |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 2 days** |
| Monetization | Free | — |
| Size | 15 MB | 6 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Devious-Monkey](https://appshunter.io/developer/388388527) | [Anatoliy Voropay](https://appshunter.io/developer/459700393) |

## What reviewers say

### dnCalc

[App page](https://appshunter.io/ios/app/dncalc/id1309683648)

Perform amazing mathematical "experiences" to impress friends and colleagues. This app allows you to reveal secret numbers, ages, zodiac signs, and more, all without touching a calculator. It's easy to use, requires no memorization, and can be done with your eyes closed.

**Highlights:** Reveal secret numbers, Peek at ages and zodiac signs, Calculate birth day of week, Create custom formulas, Works offline, Up to 5 participants

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

**In-app purchases:** none


### Reaction Speed Test Pro

[App page](https://appshunter.io/ios/app/reaction-speed-test-pro/id1603215049)

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

**In-app purchases:** none


## Frequently asked questions

### Is dnCalc free?

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

### Is Reaction Speed Test Pro free?

Reaction Speed Test Pro costs $0.99, with no in-app purchases.

### Do dnCalc or Reaction Speed Test Pro have ads?

Neither dnCalc nor Reaction Speed Test Pro shows ads.

### Which is updated more often, dnCalc or Reaction Speed Test Pro?

dnCalc ships an update fortnightly, and Reaction Speed Test Pro every 2 days. Most recently, dnCalc was updated on October 13, 2026 and Reaction Speed Test Pro on October 11, 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.*