Fast Focus vs RRLL
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Fast Focus
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How Fast can you find the numbers from 1 to 20 ? 1 to 25 ? Letters from A to T ? Fast Focus is a very simple game of fast reaction and good observation... Challenge your mind, eyes, and reflex speed to get the highest Score! You have to trace the sequence as fast as possible, while avoiding being distracted by different colour variations that will attempt to waste your precious moments.. You will need all your concentration and observation skills ! There are three modes, of varying difficulty. You can use Game Center for high scores, and to challenge others. The basic version contains ads, and the Premium version has no ads, and will offer a number of advantages.
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
Screenshots
Verdict
The clearest difference is in-app purchases: RRLL at none against Fast Focus's 1. RRLL also leads on update cadence (every 10 months vs every 69 months). Fast Focus's advantage is ads (none vs shown) and iOS requirement (8.0 vs 12.0). On price 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. Fast Focus sells 1 one-off in-app purchase. RRLL asks for nothing beyond the download.
Fast Focus ships an update every 69 months, RRLL every 10 months. The most recent releases landed on October 26, 2026 and October 17, 2026 respectively.
| Parameter | Fast Focus | RRLL |
|---|---|---|
| Price | Free | Free |
| Rating | — | 3.0 (1 ratings) — better |
| Positive reviews | — | 0.0% of reviews |
| Number of ratings | — | 1 — better |
| Update frequency | Every 69 months | Every 10 months — better |
| Ads | No — better | Yes |
| In-app purchases | Yes | No — better |
| Monetization | — | Ad-supported |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 8.0 — better | 12.0 |
| Further details — not scored | ||
| Size | 20 MB | 24 MB |
| Age rating | 4+ | 4+ |
| Developer | 111 (LLC) | YUSEI MIYOSHI |
In-app purchases
Fast Focus
- Premium Version$1.99
RRLL
No in-app purchases
