# HSL Training — Train Your Color Perception

> Train Your Color Perception (iPhone/iPad app by Riku Ito.)

- Source: https://appshunter.io/ios/app/hsl-training/id6804677578 (this page in markdown: same URL + `.md`)
- Developer: [Riku Ito](https://appshunter.io/developer/6781179895)
- Category: Education, Graphics & Design
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 6 MB
- Languages: American English, Japanese
- Released: 2026-09-04
- Data updated: 2026-09-08
- User reviews in markdown: https://appshunter.io/ios/app/hsl-training/id6804677578/reviews.md

## What is 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 EASY, NORMAL, or HARD. Keep scoring 96 or higher with no round limit; the run ends at 95 or below. Your highest streak can be submitted to a Game Center leaderboard.

FEATURES
• Fine-tune every HSL value one step at a time
• Review scores, grades, and perceptual color difference by round
• Save a best score for each mode on your device
• Japanese and English interface

LIFE
Each session costs 1 LIFE. One LIFE recovers at the start of every hour, up to a natural limit of 5. Completing an optional rewarded ad adds 5 LIFE. A one-time Unlimited Lives purchase lets you train without spending LIFE and removes banner ads.

Built for designers, illustrators, photographers, color learners, and anyone who wants to turn color matching into a game.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Unlimited Lives | $1.99 | one-time |



## Version history (last 1 release)

### 1.0 — 2026-09-04

No release notes.

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-08.*