# RRLL vs Stackel

The clearest difference is update cadence: Stackel at every 5 days against RRLL's every 10 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

RRLL ships an update every 10 months, Stackel every 5 days. The most recent releases landed on October 15, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | RRLL | Stackel |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (1 ratings)](https://appshunter.io/ios/app/rrll/id1611876569/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | Every 10 months | **Every 5 days** |
| Monetization | Ad-supported | — |
| Size | 24 MB | 65 MB |
| Requires iOS | 12.0 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [YUSEI MIYOSHI](https://appshunter.io/developer/1086550692) | [GUY WAISMAN](https://appshunter.io/developer/1696320836) |

## What reviewers say

### RRLL

[App page](https://appshunter.io/ios/app/rrll/id1611876569)

This game tests dynamic visual acuity by having players tap the correct half of the screen based on visual cues. Aim to beat your high score by accurately responding within a 10-second measurement period. Improve your reaction time and precision with this engaging challenge.

**Highlights:** Dynamic visual acuity measurement, 10-second testing periods, High score tracking, Left/right screen touch controls, Score-based feedback

**Features:** macOS Compatibility

**In-app purchases:** none


### Stackel

[App page](https://appshunter.io/ios/app/stackel/id6451363518)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is RRLL free?

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

### Is Stackel free?

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

### Do RRLL or Stackel have ads?

Both RRLL and Stackel show ads.

### Which is updated more often, RRLL or Stackel?

RRLL ships an update every 10 months, and Stackel every 5 days. Most recently, RRLL was updated on October 15, 2026 and Stackel on October 8, 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.*