# Reaction Time Training vs STACK

The clearest difference is ads: Reaction Time Training at none against STACK's shown. On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. Reaction Time Training sells 9 in-app purchases, starting at $2.99 per 7 days and STACK sells 5 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Reaction Time Training ships an update every 10 days, STACK every 2 weeks. The most recent releases landed on September 24, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | Reaction Time Training | STACK |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (203 ratings)](https://appshunter.io/ios/app/reaction-time-training-rtap/id6560115310/reviews)** | — |
| Number of ratings | **203** | — |
| Positive reviews | 55.6% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 10 days** | Every 2 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 89 MB | 25 MB |
| Requires iOS | 15.3 | **15.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Jan Augustyniak](https://appshunter.io/developer/1739379260) | [Jonathan Rycx](https://appshunter.io/developer/6776471796) |

## What reviewers say

### Reaction Time Training

[App page](https://appshunter.io/ios/app/reaction-time-training-rtap/id6560115310)

Enhance your reflexes with engaging mini-games designed to test and improve reaction speed. Track your progress, compete with friends in duels, and climb leaderboards to unlock achievements. Ideal for anyone looking to sharpen their reaction time.

**Highlights:** Reaction time testing, Challenging mini-games, Progress tracking, Friend duels, Leaderboards, Achievement unlocking

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

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlimited Access | $2.99 | per 7 days |
| Unlimited Access | $4.99 | per month |
| Unlimited Access | $4.99 | per 7 days |
| Unlimited Access | $7.99 | per month |
| Unlimited Access | $19.99 | per year |
| Unlimited Access | $19.99 | per year |
| Unlimited Access | Free | one-time |
| Unlimited Access | $14.99 | one-time |
| Unlimited Access | $29.99 | one-time |


### STACK

[App page](https://appshunter.io/ios/app/stack-tower-builder/id6796613603)

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 250 Gems | $0.99 | one-time |
| 700 Gems | $2.99 | one-time |
| 1,500 Gems | $5.99 | one-time |
| Full Game | $7.99 | one-time |
| 3,500 Gems | $9.99 | one-time |


## Frequently asked questions

### Is Reaction Time Training free?

Reaction Time Training is free to download, with in-app purchases available.

### Is STACK free?

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

### Do Reaction Time Training or STACK have ads?

STACK shows ads; Reaction Time Training does not.

### Which is updated more often, Reaction Time Training or STACK?

Reaction Time Training ships an update every 10 days, and STACK every 2 weeks. Most recently, Reaction Time Training was updated on September 24, 2026 and STACK on September 10, 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.*