# Sun to Moon Sleep Clock vs Readability

The clearest difference is price: Readability at Free against Sun to Moon Sleep Clock's $2.99. Readability also leads on ratings volume (26K vs 107) and update cadence (fortnightly vs every 2 months). Sun to Moon Sleep Clock's advantage is review sentiment (94% vs 55%) and in-app purchases (none vs 2). On rating, ads and device support there is nothing between them.

Readability is free to download; Sun to Moon Sleep Clock costs $2.99 up front. Readability sells 2 in-app purchases, starting at $19.99 per month. Sun to Moon Sleep Clock asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.5 for Sun to Moon Sleep Clock against 4.6 for Readability. That said, the two scores are not equally well evidenced: Readability has 26K ratings behind it against 107, so its average is the more settled of the two. Written reviews are what separate them: 94% of Sun to Moon Sleep Clock's written reviews are positive against 55% of Readability's.

Sun to Moon Sleep Clock ships an update every 2 months, Readability fortnightly. The most recent releases landed on November 6, 2026 and November 11, 2026 respectively.

## The numbers

| Metric | Sun to Moon Sleep Clock | Readability |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | [4.5 (107 ratings)](https://appshunter.io/ios/app/sun-to-moon-sleep-clock/id1052898458/reviews) | **[4.6 (26K ratings)](https://appshunter.io/ios/app/readability-learn-to-read/id1477213383/reviews)** |
| Number of ratings | 107 | **26K** |
| Positive reviews | **94.1% of reviews** | 55.3% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Fortnightly** |
| Monetization | **Free** | Free with in-app purchases |
| Best chart rank | — | **#175** |
| Size | 52 MB | 247 MB |
| Requires iOS | **13.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Michael Sibley](https://appshunter.io/developer/1052898457) | [e4site Inc.](https://appshunter.io/developer/1477213382) |

## What reviewers say

### Sun to Moon Sleep Clock

[App page](https://appshunter.io/ios/app/sun-to-moon-sleep-clock/id1052898458)

This app acts as a gentle sleep trainer for young children, visually indicating when it's time to stay in bed and when it's okay to wake up. It offers customizable features like sleep sounds, nap timers, and a reward system to encourage good sleep habits.

**Highlights:** Visual star countdown for bedtime, Customizable sleep and wake sounds, Nap timers and bedtime routine tools, Personalizable characters with outfits, Optional Snooze Rewards system, Visual shooting-star progress bar, PIN-protected settings

**Features:** macOS Compatibility

**In-app purchases:** none


### Readability

[App page](https://appshunter.io/ios/app/readability-learn-to-read/id1477213383)

**Currently charting:** #175 Top Grossing · Education (US App Store)

This app offers AI-powered reading assistance for children, acting like a personal tutor. It listens as kids read, provides real-time pronunciation correction, and enhances vocabulary and comprehension through interactive questions. Parents can track progress via a dashboard.

**Highlights:** AI-powered reading assistance, Real-time pronunciation correction, Interactive comprehension questions, Personalized vocabulary lists, Parent progress dashboard, Grade-level stories and books

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Readability Tutor | $19.99 | per month |
| Readability Tutor Annual | $139.99 | per year |

**What reviewers like**

- 👍 Helpful for struggling readers
- 🚀 Improves reading fluency
- 💡 Engaging for kids
- 👍 Useful data and progress tracking

**What reviewers complain about**

- 🐛 Voice recognition issues
- 🐛 Inaccurate comprehension tests
- 💰 Expensive subscription
- 🐛 Glitchy performance

**Reported bugs**

- App charges for free trial
- Subscription cancellation issues
- Inconsistent app behavior
- Compatibility problems on some devices

**Requested features**

- More customization options for text and background
- Improved voice recognition accuracy
- Expanded book selection
- Better comprehension testing


## Frequently asked questions

### Is Sun to Moon Sleep Clock free?

Sun to Moon Sleep Clock costs $2.99, with no in-app purchases.

### Is Readability free?

Readability is free to download, with in-app purchases available.

### Which has better reviews, Sun to Moon Sleep Clock or Readability?

Readability is rated higher. Sun to Moon Sleep Clock averages 4.5 out of 5 from 107 ratings, while Readability averages 4.6 from 26K ratings.

### Do Sun to Moon Sleep Clock or Readability have ads?

Neither Sun to Moon Sleep Clock nor Readability shows ads.

### Which is updated more often, Sun to Moon Sleep Clock or Readability?

Sun to Moon Sleep Clock ships an update every 2 months, and Readability fortnightly. Most recently, Sun to Moon Sleep Clock was updated on November 6, 2026 and Readability on November 11, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*