# CogniLens vs Readgio

The clearest difference is rating: CogniLens at 5.0 against Readgio's 4.8. CogniLens also leads on iOS requirement (16.4 vs 18.5). Readgio's advantage is ratings volume (5 vs 1). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. CogniLens sells 2 in-app purchases, starting at $5.00 per month and Readgio sells 3 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

CogniLens holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Readgio has 5 ratings behind it against 1, so its average is the more settled of the two.

CogniLens ships an update every 3 weeks, Readgio fortnightly. The most recent releases landed on October 31, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | CogniLens | Readgio |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/cognilens/id6757313568/reviews)** | [4.8 (5 ratings)](https://appshunter.io/ios/app/readgio-epub-and-pdf-reader/id6757845515/reviews) |
| Number of ratings | 1 | **5** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Fortnightly** |
| Monetization | Freemium | Freemium |
| Size | 90 MB | 69 MB |
| Requires iOS | **16.4** | 18.5 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Cognition Labs](https://appshunter.io/developer/1671250656) | [Anna Sadnova](https://appshunter.io/developer/1832117340) |

## What reviewers say

### CogniLens

[App page](https://appshunter.io/ios/app/cognilens/id6757313568)

This app transforms text to make it more readable for individuals with dyslexia and ADHD. Customize spacing, size, and layout, or use text-to-speech. It supports document uploads, text pasting, and photo scanning.

**Highlights:** Text transformation for readability, Customizable layout and spacing, Text-to-speech functionality, Document upload and text pasting, Photo scanning for text conversion, Light/dark mode and focus controls

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CogniLens Monthly | $5.00 | per month |
| CogniLens Yearly | $54.00 | per year |


### Readgio

[App page](https://appshunter.io/ios/app/readgio-epub-and-pdf-reader/id6757845515)

This app allows you to read your EPUB and PDF files, tracking your reading progress, time, and speed automatically. Save and revisit highlighted passages, and even log physical book reading sessions to keep your entire reading history in one place.

**Highlights:** Automatic reading progress tracking, Chapter time estimation, Adjustable PDF reader mode, Highlighting and quote saving, Manual logging for physical books, iCloud sync for progress and bookmarks

**Features:** macOS Compatibility, Vision Pro support, iPhone Duo support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro: monthly | $1.99 | per month |
| Pro: annual | $13.99 | per year |
| Pro: lifetime | $19.99 | one-time |


## Frequently asked questions

### Is CogniLens free?

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

### Is Readgio free?

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

### Which has better reviews, CogniLens or Readgio?

CogniLens is rated higher. CogniLens averages 5.0 out of 5 from 1 ratings, while Readgio averages 4.8 from 5 ratings.

### Do CogniLens or Readgio have ads?

Neither CogniLens nor Readgio shows ads.

### Which is updated more often, CogniLens or Readgio?

CogniLens ships an update every 3 weeks, and Readgio fortnightly. Most recently, CogniLens was updated on October 31, 2026 and Readgio on November 5, 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.*