RRLL vs Stackel
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
RRLL
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.
- Dynamic visual acuity measurement
- 10-second testing periods
- High score tracking
- Left/right screen touch controls
- Score-based feedback
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RRLL is a game that measures dynamic visual acuity. When you start the game, the measurement for 10 seconds will start. Let's measure with the aim of updating the high score. R: Touch the right half of the screen. L: Touch the left half of the screen. Good = score + 100 / Miss = score - 100
Stackel
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Stackel is an engaging mobile game where your objective is to merge cards of the same value. Challenge yourself to surpass your previous high score! To play, simply tap or drag cards to merge them. When two cards with matching values are merged, a new card with an increased value is created. Be careful not to let the cards stack up beyond 7 rows, as this will result in failure. However, fear not, as you can earn coins throughout the game by achieving combo merges, leveling up, achieving new high scores, merging the elusive 1 million card, or even by watching ads. With the coins you earn, you have the option to purchase useful power-ups. These power-ups can be a game-changer in challenging situations. Here are three power-ups at your disposal: 1. Bomb: Destroy an entire row of cards with this power-up. 2. Swap Cards: Swap the positions of two cards, strategizing your moves. 3. Card X4: Multiply the value of a card by 4, increasing its potential. Utilize these power-ups wisely to overcome difficult moments and progress further in the game. Plus, by using your collected coins or watching ads , you can even continue playing when the game appears to be over. Have a blast playing Stackel and aim for new heights!
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | RRLL | Stackel |
|---|---|---|
| Price | Free | Free |
| Rating | 3.0 (1 ratings) — better | — |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 10 months | Every 5 days — better |
| Ads | Yes | Yes |
| In-app purchases | No | No |
| Monetization | Ad-supported | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 24 MB | 65 MB |
| Age rating | 4+ | 4+ |
| Developer | YUSEI MIYOSHI | GUY WAISMAN |
In-app purchases
RRLL
No in-app purchases
Stackel
No in-app purchases









