# Readability vs Cosmo (formerly ClassUp)

The clearest difference is monetization model: Cosmo (formerly ClassUp) at free with in-app purchases against Readability's subscription. Cosmo (formerly ClassUp) also leads on review sentiment (80% vs 56%). Readability's advantage is ratings volume (24K vs 879) and chart position (#196 vs unranked). On price, rating, update cadence and ads there is nothing between them.

Both are free to download. Readability sells 2 in-app purchases, starting at $19.99 per month and Cosmo (formerly ClassUp) sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.6 for Readability against 4.5 for Cosmo (formerly ClassUp). That said, the two scores are not equally well evidenced: Readability has 24K ratings behind it against 879, so its average is the more settled of the two. Written reviews are what separate them: 56% of Readability's written reviews are positive against 80% of Cosmo (formerly ClassUp)'s.

Readability ships an update fortnightly, Cosmo (formerly ClassUp) every 9 days. Both last shipped on September 24, 2026.

## The numbers

| Metric | Readability | Cosmo (formerly ClassUp) |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (24K ratings)](https://appshunter.io/ios/app/readability-learn-to-read/id1477213383/reviews)** | [4.5 (879 ratings)](https://appshunter.io/ios/app/cosmo-formerly-classup/id1624007748/reviews) |
| Number of ratings | **24K** | 879 |
| Positive reviews | 55.9% of reviews | **80.1% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 9 days** |
| Monetization | Subscription | **Free with in-app purchases** |
| Best chart rank | **#196** | — |
| Size | 264 MB | 408 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [e4site Inc.](https://appshunter.io/developer/1477213382) | [Algorithm of Learning Inc.](https://appshunter.io/developer/1787524245) |

## What reviewers say

### Readability

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

**Currently charting:** #196 Top Grossing · Education (US App Store)

This app uses AI-powered voice technology to provide personalized reading tutoring for children. It listens as kids read aloud, offers pronunciation correction, and assesses comprehension through interactive questions. The app also builds vocabulary and allows parents to track progress.

**Highlights:** AI-powered voice recognition for reading practice, Real-time pronunciation correction, Interactive voice-based comprehension questions, Personalized vocabulary lists, Parent dashboard for progress tracking, Engaging grade-level stories with illustrations

**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


### Cosmo (formerly ClassUp)

[App page](https://appshunter.io/ios/app/cosmo-formerly-classup/id1624007748)

This app offers AI-powered, personalized learning experiences guided by real teachers. It provides live 1-on-1 classes, instant homework help, and adaptive learning plans to foster confident and motivated learners.

**Highlights:** Live 1-on-1 classes with AI and human teachers, AI-powered personalized learning plans, Instant homework help and chat support, AI writing tool for assignments, Unlimited practice for Math & ELA, Progress tracking dashboard

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| First Class | $0.99 | one-time |
| Test 20 lessons package | $0.99 | one-time |
| 3 one-on-one classes | $74.99 | one-time |

**What reviewers like**

- 👍 Awesome teachers
- 🚀 Personalized learning
- 💡 Engaging and fun lessons
- 🚀 Flexible scheduling
- 👍 Knowledgeable and professional tutors

**What reviewers complain about**

- 🐛 Scheduling issues and class cancellations
- 💰 Expensive pricing
- 🤯 Poor customer service and communication
- 🐛 Technical issues with app and connectivity

**Reported bugs**

- Frequent class cancellations
- Billing and refund issues
- Unreliable internet connectivity during classes

**Requested features**

- More affordable pricing options
- Improved scheduling and class management
- Better communication with parents
- Enhanced technical stability and reliability


## Frequently asked questions

### Is Readability free?

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

### Is Cosmo (formerly ClassUp) free?

Cosmo (formerly ClassUp) is free to download, with in-app purchases available.

### Which has better reviews, Readability or Cosmo (formerly ClassUp)?

Readability is rated higher. Readability averages 4.6 out of 5 from 24K ratings, while Cosmo (formerly ClassUp) averages 4.5 from 879 ratings.

### Do Readability or Cosmo (formerly ClassUp) have ads?

Neither Readability nor Cosmo (formerly ClassUp) shows ads.

### Which is updated more often, Readability or Cosmo (formerly ClassUp)?

Readability ships an update fortnightly, and Cosmo (formerly ClassUp) every 9 days. Most recently, Readability was updated on September 24, 2026 and Cosmo (formerly ClassUp) on September 24, 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.*