# Acellus vs Readability

The clearest difference is in-app purchases: Acellus at none against Readability's 2. Readability's advantage is update cadence (fortnightly vs every 3 months) and review sentiment (56% vs 36%). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. Readability sells 2 in-app purchases, starting at $19.99 per month. Acellus asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.5 for Acellus against 4.6 for Readability. Both are backed by a comparable volume of ratings — 32K and 25K respectively. Written reviews are what separate them: 36% of Acellus's written reviews are positive against 56% of Readability's.

Acellus ships an update every 3 months, Readability fortnightly. Both last shipped on October 19, 2026.

## The numbers

| Metric | Acellus | Readability |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (32K ratings)](https://appshunter.io/ios/app/acellus/id1050216640/reviews) | **[4.6 (25K ratings)](https://appshunter.io/ios/app/readability-learn-to-read/id1477213383/reviews)** |
| Number of ratings | **32K** | 25K |
| Positive reviews | 35.9% of reviews | **55.6% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Fortnightly** |
| Monetization | **Free** | Subscription |
| Best chart rank | — | **#173** |
| Size | 7 MB | 282 MB |
| Requires iOS | 16.4 | 16.4 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [GoldKey Security Corporation](https://appshunter.io/developer/481443211) | [e4site Inc.](https://appshunter.io/developer/1477213382) |

## What reviewers say

### Acellus

[App page](https://appshunter.io/ios/app/acellus/id1050216640)

This online learning system offers a dynamic and interactive educational experience for K-12 students. It uses short video lessons and practice problems to assess understanding, with personalized instruction and real-time progress monitoring available.

**Highlights:** Self-paced learning, Personalized instruction, Live progress monitoring, Automatic record-keeping, Data-driven instruction, Comprehensive K-12 curriculum

**In-app purchases:** none

**What reviewers like**

- 👍 Easy to navigate classes
- 👍 Engaging and interactive lessons
- 👍 Flexible and self-paced learning
- 👍 Helpful and fun teachers
- 👍 Ability to track progress and compete with friends

**What reviewers complain about**

- 🐛 Occasional crashes and freezes
- 🐛 Incorrect answers marked as wrong
- 🐛 Lessons not always aligned with assessments
- 🐛 Boring or gimmicky teaching styles in some courses
- 🐛 Lack of live teacher interaction and support

**Reported bugs**

- Videos randomly restarting or freezing
- Incorrect grading of written assignments
- Inability to review past lessons and videos
- Courses not properly syncing progress across devices

**Requested features**

- Add subtitles or transcripts for videos
- Allow skipping of videos if content is already understood
- Improve mobile app usability and stability
- Provide more hands-on and interactive learning experiences
- Offer more personalized learning paths and feedback


### Readability

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

**Currently charting:** #173 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


## Frequently asked questions

### Is Acellus free?

Acellus is free to download, with no in-app purchases.

### Is Readability free?

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

### Which has better reviews, Acellus or Readability?

Readability is rated higher. Acellus averages 4.5 out of 5 from 32K ratings, while Readability averages 4.6 from 25K ratings.

### Do Acellus or Readability have ads?

Neither Acellus nor Readability shows ads.

### Which is updated more often, Acellus or Readability?

Acellus ships an update every 3 months, and Readability fortnightly. Most recently, Acellus was updated on October 19, 2026 and Readability on October 19, 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.*