# CastReader — Read Aloud + AI Explain

> Read Kindle, PDFs, articles and books aloud with synced highlights. AI explains difficult passages. Natural voices in 8 languages.

Canonical page: [https://chrome-stats.com/d/castreader-tts-reader](https://chrome-stats.com/d/castreader-tts-reader)

## Overview

- **ID:** `castreader-tts-reader`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** CastReader
- **Category:** feeds-news-blogging,language-support
- **Daily users:** 233
- **Weekly downloads:** 49
- **Rating:** 3.33 / 5 (3 ratings)
- **Version:** 1.2.42
- **Last updated:** 2026-09-13
- **First published:** 2026-03-16
- **Size:** 14 MB
- **Data as of:** 2026-09-14
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/castreader-tts-reader/)
- **Website:** [https://castreader.com/](https://castreader.com/)

## Description

CastReader makes long-form reading easier with natural text-to-speech, synchronized word and paragraph highlights, and automatic scrolling. Listen to webpages, articles, PDFs, Word files, text files, books, and Kindle Cloud Reader content while keeping the original text and layout in view. Click any paragraph to resume reading, adjust playback speed, and choose from available voices.

Use AI Explain to understand difficult passages directly on the original page without replacing the source text. CastReader automatically extracts main content while skipping navigation and ads, and supports English, Mandarin Chinese, Japanese, Spanish, French, Brazilian Portuguese, Italian, and Hindi. The free plan includes daily read-aloud and AI Explain limits, while Pro adds unlimited listening and explanations, faster playback, and additional premium voices. Text is processed only when requested, with anonymous analytics that exclude page content and personal information.

## Rankings

- #7,687 — Overall
- #331 — Language Support
- #25 — kindle
- #106 — reader
- #113 — ai
- #122 — booking

## Permissions and access

### Permissions

- `activeTab`
- `storage`
- `scripting`
- `contextMenus`
- `alarms`
- `*://api.castreader.ai/*`
- `*://api.castreader.cn/*`
- `*://quickread.castreader.cn/*`
- `*://castreader.ai/*`
- `*://*.cos.accelerate.myqcloud.com/*`
- `https://zqxgmqygirtpttnrvjpf.supabase.co/*`
- `*://weread.qq.com/*`
- `*://www.youtube.com/*`
- `https://read.amazon.com/*`
- `https://read.amazon.co.uk/*`
- `https://read.amazon.ca/*`
- `https://read.amazon.com.au/*`
- `https://read.amazon.co.jp/*`
- `https://lesen.amazon.de/*`
- `https://read.amazon.de/*`
- `https://lire.amazon.fr/*`
- `https://read.amazon.fr/*`
- `https://leggi.amazon.it/*`
- `https://read.amazon.it/*`
- `https://leer.amazon.es/*`
- `https://read.amazon.es/*`
- `https://read.amazon.in/*`
- `https://ler.amazon.com.br/*`
- `https://read.amazon.com.br/*`
- `https://leer.amazon.com.mx/*`
- `https://read.amazon.com.mx/*`
- `https://lezen.amazon.nl/*`
- `https://read.amazon.nl/*`
- `https://read.amazon.cn/*`
- `*://docs.google.com/*`
- `<all_urls>`

### Content script matches

- `<all_urls>`
- `docs.google.com`
- `*.ireader.com.cn`
- `ireader.com.cn`
- `leer.amazon.com.mx`
- `leer.amazon.es`
- `leggi.amazon.it`
- `ler.amazon.com.br`
- `lesen.amazon.de`
- `lezen.amazon.nl`
- `lire.amazon.fr`
- `read.amazon.ca`
- `read.amazon.cn`
- `read.amazon.co.jp`
- `read.amazon.co.uk`
- `read.amazon.com.au`
- `read.amazon.com.br`
- `read.amazon.com.mx`
- `read.amazon.com`
- `read.amazon.de`
- `read.amazon.es`
- `read.amazon.fr`
- `read.amazon.in`
- `read.amazon.it`
- `read.amazon.nl`
- `castreader.com`
- `www.castreader.com`
- `weread.qq.com`
- `www.youtube.com`
- `youtu.be`

## Safety

- **Risk impact:** Very high risk impact
- **Risk likelihood:** Moderate risk likelihood

### Analysis details

- Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
- This extension was recently updated in the past month. New updates may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

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Source: [Chrome-Stats](https://chrome-stats.com/d/castreader-tts-reader)