AppMarketSpy › Education › HSL Training
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App info
- Developer
- Riku Ito
- Category
- Education, Graphics & Design
- Released
- Sep 4, 2026
- Version
- 1.1 (Sep 10, 2026)
- Price
- Free
- Size
- 5.7 MB
- Requires
- iOS 17.0
- Age rating
- 4+
- Languages
- English and Japanese
In-app purchases
| Unlimited Lives | $1.99 |
Current prices, App Store US.
🔒 Price history2 snapshots: when prices changed and new plans appearedGet Pro access
About HSL Training
HSL Training is a color-perception game for practicing hue, saturation, and lightness. Observe the target color, then recreate it with H, S, and L sliders and one-step adjustment buttons. Each answer is scored from 0 to 100 using perceptual color difference (CIEDE2000). FIVE TRAINING MODES • EASY: Lock lightness and focus on hue and saturation • NORMAL: Match hue, saturation, and lightness across five rounds • HARD: Ten rounds with a 30-second clock for each color • ABSOLUTE: Match colors shown against different backgrounds • MEMORY: Memorize each target for 10 seconds, then recreate it while hidden Clear every standard round with an S grade to unlock ENDLESS for that mode. Keep scoring 96 or higher with no round limit; the run ends at 95 or below. EASY, NORMAL, and HARD streaks can be submitted to Game Center leaderboards. ABSOLUTE and MEMORY streaks stay on your device. FEATURES •…
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