# Memory Math vs CastReader

The clearest difference is price: CastReader at Free against Memory Math's $2.99. CastReader also leads on update cadence (every 2 days vs every 38 months) and device support (3 vs 1). Memory Math's advantage is in-app purchases (none vs 5). On ads there is nothing between them.

CastReader is free to download; Memory Math costs $2.99 up front. CastReader sells 5 in-app purchases, starting at $4.99 per month. Memory Math asks for nothing beyond the download.

Memory Math ships an update every 38 months, CastReader every 2 days. The most recent releases landed on October 5, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | Memory Math | CastReader |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | — | **[4.8 (39 ratings)](https://appshunter.io/ios/app/castreader-read-aloud-books/id6757636395/reviews)** |
| Number of ratings | — | **39** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 38 months | **Every 2 days** |
| Monetization | — | Free |
| Size | 6 MB | 157 MB |
| Requires iOS | 26.0 | **17.6** |
| Devices | iPhone | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Sigma Sky, LLC](https://appshunter.io/developer/320947305) | [ohsame Inc](https://appshunter.io/developer/944872977) |

## What reviewers say

### Memory Math

[App page](https://appshunter.io/ios/app/memory-math-plus-x/id1482272700)

**Features:** macOS Compatibility

**In-app purchases:** none


### CastReader

[App page](https://appshunter.io/ios/app/castreader-read-aloud-books/id6757636395)

This app transforms your reading into an audio experience with natural voices and synced highlighting. It offers AI-powered explanations for complex passages, making difficult texts easier to understand. Listen to books, documents, and web pages while on the go.

**Highlights:** Listen to Kindle books, PDFs, EPUBs, AI explanations for complex text, Synced highlighting with read-aloud, Auto-scroll and resume progress, Background and lock-screen playback, Supports web pages, photos, and pasted text

**Features:** Safari Extension, Vision Pro support

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CastReader Pro (Monthly) | $4.99 | per month |
| CastReader Pro (Monthly) | $9.99 | per month |
| CastReader Pro (Yearly) | $34.99 | per year |
| CastReader Pro (Yearly) | $59.99 | per year |
| 120 Clone Voice Minutes | $2.99 | one-time |


## Frequently asked questions

### Is Memory Math free?

Memory Math costs $2.99, with no in-app purchases.

### Is CastReader free?

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

### Do Memory Math or CastReader have ads?

Neither Memory Math nor CastReader shows ads.

### Which is updated more often, Memory Math or CastReader?

Memory Math ships an update every 38 months, and CastReader every 2 days. Most recently, Memory Math was updated on October 5, 2026 and CastReader on October 21, 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.*