# Zalza — Sleep Cycle Calculator

> Sleep Cycle Calculator (iPhone/iPad app by YEEUN KIM.)

- Source: https://appshunter.io/ios/app/zalza/id6760538161 (this page in markdown: same URL + `.md`)
- Developer: [YEEUN KIM](https://appshunter.io/developer/1884852543)
- Category: Health & Fitness, Lifestyle
- Price: Free
- Age rating: 17+
- Requires: iOS 15.1 · 33 MB
- Languages: American English
- Released: 2026-03-20
- Data updated: 2026-08-08
- User reviews in markdown: https://appshunter.io/ios/app/zalza/id6760538161/reviews.md

## What is Zalza?

'Zalza' means 'Good night' in Korean.

Your healthy life starts with how well you slept last night. From daily vitality and stress management to disease prevention—the core of all health care lies in 'Quality Sleep.'

'Zalza' finds the optimal wake-up time for you to feel most refreshed and guides you toward healthy sleep habits.

[Key Features]

• Sleep Cycle Calculation: Recommends the perfect wake-up time for you, from 2 to 6 cycles, considering REM and deep sleep stages.

• Customizable Fall-Asleep Time: Set the time it takes for you to fall asleep for more precise calculations.

• Dual Calculation Modes: Choose between "If I sleep now, when should I wake up?" or "Wake up/Sleep at a specific time" based on your situation.

• Sleep Guide: Provides useful knowledge about sleep and tips on how to use the app effectively.

• User-Friendly Settings: Features a 24-hour format On/Off mode and personalized cycle time settings.

• Global Support: Supports 4 languages (Korean, English, Spanish, and Japanese) for convenient use anywhere in the world.

Zalza sincerely cheers for your day.

Please share 'Zalza' with your beloved family and friends. Your support is a great motivation for us to provide better service!


## Version history (last 2 releases)

### 1.0.1 — 2026-06-22

Introduced ads to keep our services free.

### 1.0 — 2026-03-20

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 2026-08-08.*