# Zzzly: Ai Sleeping Assistant — Ai Sleeping Calculator

> Ai Sleeping Calculator (iPhone/iPad app by Chai Yeung Leung.)

- Source: https://appshunter.io/ios/app/zzzly/id6748530606 (this page in markdown: same URL + `.md`)
- Developer: [Chai Yeung Leung](https://appshunter.io/developer/1095605120)
- Category: Utilities, Lifestyle
- Price: $0.99 with in-app purchases
- Age rating: 4+
- Requires: iOS 12.0 · 157 MB
- Languages: American English
- Released: 2025-08-31
- Data updated: 2026-05-13
- User reviews in markdown: https://appshunter.io/ios/app/zzzly/id6748530606/reviews.md

## What is Zzzly?

Transform your sleep quality with our all-in-one sleep optimization app! Designed by sleep specialists, Sleep Assistant helps you fall asleep faster, wake up refreshed, and maintain healthy sleep patterns.

 KEY FEATURES:

 SMART SLEEP CALCULATOR
    Calculate optimal bedtime based on sleep cycles

    Find perfect wake-up times within light sleep phases

    Personalized sleep duration recommendations


 INTELLIGENT ALARM SYSTEM

    Wakes you during lightest sleep phase within 30-minute window

    Gentle gradual volume increase

    Customizable alarm tones and patterns

PREMIUM SLEEP SOUNDS LIBRARY

    20+ high-quality ambient sounds

    White noise, brown noise, and pink noise options

    Nature sounds: rain, ocean, forest, thunderstorm


 NAP OPTIMIZER & TIMER

    Power nap (20 min) and full cycle (90 min) options

    Prevents sleep inertia with smart wake-up

    Energy boost scheduling

JET LAG ASSISTANT

    Personalized adjustment plans for travel

    Light exposure recommendations

    Melatonin timing guidance

    Multi-timezone support


 GLOBAL ACCESSIBILITY

    Available in 25 languages

    Cultural adaptation for all regions

    Localized sleep recommendations

 PRIVACY FIRST

    No registration required

    All data stays on your device

VIP subscription service:
• Weekly purchase: $1.99 USD /week
• Monthly subscription: $6.99 USD/month
• Annual subscription: $36.99 USD/year

Subscriptions will auto-renew unless canceled at least 24 hours before the current billing period ends. You can manage your subscriptions in your App Store account settings.

Terms of Service: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

## Pricing and in-app purchases

Base price: $0.99.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Monthly VIP | $6.99 | per month |
| Weekly VIP | $1.99 | per 7 days |
| Yearly VIP | $39.99 | per year |



## Version history (last 2 releases)

### 1.2 — 2025-09-03

fixed a VIP bug

### 1.0 — 2025-08-31

No release notes.

## Apps similar to Zzzly

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| [Bed Time \| Large Clock](https://appshunter.io/ios/app/bed-time-large-clock/id1254058826) | 4.7 (365) | $1.99 | Utilities |
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| [Alarmi - AI Alarm Clock](https://appshunter.io/ios/app/alarmi/id6505002145) | — | Free | Utilities |
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| [Sleep Cycle Calculator: Sounds](https://appshunter.io/ios/app/sleep-cycle-calculator/id1669183385) | 4.7 (15) | Free | Utilities |

## More apps by Chai Yeung Leung

- [PetSay寵物港 - 香港寵物討論區](https://appshunter.io/ios/app/petsay/id1431713555)
- [Mark Six Pro: Mark Six result](https://appshunter.io/ios/app/mark-six-pro/id6744363238)
- [Kids Bio:Animal Plant Insect](https://appshunter.io/ios/app/kids-bio/id6745746775)
- [Taiwan Lottery App](https://appshunter.io/ios/app/taiwan-lottery-app/id6746245894)
- [Ai Picker : No doubt. More fun](https://appshunter.io/ios/app/ai-picker/id6747261717)

All apps by Chai Yeung Leung: https://appshunter.io/developer/1095605120

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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 2026-05-13.*