CastReader adds a Listen button to your emails — Gmail, Outlook, QQ Mail, and any webmail. One click to hear the email read aloud with natural AI voices and paragraph highlighting.
Built-in support for major webmail platforms, plus auto-detection for everything else
Open any email in Gmail and a Listen button appears next to the subject line. CastReader detects Gmail SPA navigation — the button follows as you switch between emails. Smart extraction reads only the email body, skipping navigation, signatures, and quoted reply chains.
Full support for Outlook.com (personal) and Office 365 (work/school). CastReader detects Outlook ARIA heading structure and document role containers. When you switch emails — even though Outlook reuses the same DOM element — the Listen button updates correctly.
QQ Mail renders email bodies inside same-origin iframes. CastReader reaches into the iframe to extract the email content, while keeping the Listen button in the top frame next to the subject. Both the new QQ Mail (wx.mail.qq.com) and classic version are supported.
For webmail platforms CastReader does not have specific rules for, it uses heuristic auto-detection: ARIA heading roles for the subject line, iframe traversal for email bodies, and semantic container detection. If the hostname contains mail and it finds a subject-like heading, it adds the Listen button automatically.
Email UIs are cluttered — folder lists, toolbars, ads, quoted reply chains, signatures, footer disclaimers. CastReader webmail extractor uses leaf-block traversal with BR-split to extract clean paragraph-level text. Blockquotes and reply history are excluded. You hear the message, not the interface around it.
The average office worker receives 120+ emails per day. Reading all of them takes time you do not have — especially when half are newsletters, updates, and FYI-forwards. Listening to emails turns dead time (commuting, cooking, walking) into productive inbox time. Instead of staring at a screen, you can process your inbox with your ears.
Built-in email read-aloud options are fragmented. Gmail has none. Outlook desktop has Immersive Reader (buried under View menu). Outlook web has partial support. Yahoo and other providers have nothing. Your phone accessibility features (iOS Speak Screen, Android Select to Speak) work but read the entire screen including UI elements. There is no unified, clean solution — until now.
CastReader takes a different approach. Instead of being a generic page reader that hopes for the best, it specifically detects webmail platforms and adapts its extraction strategy. For Gmail, it knows the subject is an h2 with class hP. For Outlook, it targets the ARIA document role container. For QQ Mail, it traverses into same-origin iframes. For unknown webmail, it falls back to heuristic detection using ARIA roles, heading elements, and iframe content analysis.
The extraction layer is equally tailored. Emails have unique content patterns: the actual message at the top, followed by quoted reply chains, signatures, legal disclaimers, and sometimes HTML newsletter layouts with tables and images. CastReader webmail extractor uses leaf-block traversal to extract only visible text blocks, excludes blockquote elements (reply chains), and filters out common noise patterns like embedded attachments and advertising content.
All of this is free to use. No signup needed. One Chrome or Edge extension that works across Gmail, Outlook, QQ Mail, and auto-detects other webmail platforms. Install it and every email in your inbox becomes listenable. Upgrade to CastReader Pro for premium voices, more listening hours, and AI document analysis.
Everything about reading emails aloud
Built-in support for Gmail, Outlook.com, Office 365, and QQ Mail. Auto-detection for other webmail platforms — if the hostname contains mail and has an identifiable subject heading, CastReader will add the Listen button.
Browser read-aloud features (like Edge Read Aloud) read the entire page — including navigation, sidebars, and UI elements. CastReader extracts only the email body content, skipping everything else. It also adds a dedicated Listen button next to the subject line for one-click access.
No. CastReader webmail extractor specifically filters out blockquoted reply chains, signatures, and footer disclaimers. You hear only the new content in the email.
Yes — that is one of the best use cases. Open your email in Chrome or Edge on your laptop, click Listen, and process your inbox while commuting. CastReader auto-scrolls and highlights as it reads.
Yes. Many marketing emails and newsletters use complex HTML with tables and images. CastReader extraction handles these layouts and pulls out the readable text content in the correct order.
Yes — CastReader is free to use, no signup. Works across all supported email providers. CastReader Pro (optional) adds premium ultra-realistic voices, more listening hours, voice cloning, and AI document analysis.
CastReader uses the Kokoro AI voice engine with natural-sounding voices in 40+ languages. The voice is automatically selected based on the detected language of the email.
CastReader works with webmail (email in the browser). It does not work with desktop email clients like Thunderbird, Apple Mail, or the Outlook desktop app. For those, use the built-in accessibility features of your operating system.
Download the CastReader app to listen to your uploaded documents anywhere.
Hard numbers — not vibes — from authoritative sources
$2.22 billion
US audiobook sales in 2024, up 13% year-over-year (Publishers Weekly / Audio Publishers Association)
Source →51%
of US adults have listened to an audiobook in 2025 — roughly 134 million people (APA Consumer Survey 2025)
Source →2.2 billion
people globally with near- or far-vision impairment (WHO Fact Sheet, 2024). TTS is the primary access path for digital reading content.
Source →78%
of audiobook listeners multitask while listening — commute, chores, exercise (Audiolibrix Great Audiobook Survey, 2024)
Source →27.2 minutes
average single-trip US commute in 2024, up from 26.8 (US Census ACS via Statista). That's nearly an hour each day of audio-only time.
Source →effect size 0.35
measured comprehension lift from TTS for reading-disabled students across 22 studies (Wood, Moxley, Tighe & Wagner, Journal of Learning Disabilities, 2018)
Source →15.5 million
US adults with ADHD per CDC 2024 — about half diagnosed in adulthood (CDC MMWR, October 2024)
Source →Every Chrome Web Store review below is verifiable at the link in each card. We don't hide negative feedback — we answer it within 24 hours.
“This is 1 of the best TTS and its smooth. If this is truly free i'll keep this 100%. Every other TTS says its free but has a secret. They interrupt or they just say better ai voices pay. But i like this voice. I've tried loads and this is 1 of the best ones that actually says free.”
“Works perfectly on vivaldi. One suggestion though. I wish it had a play button appear next to a paragraph when we hover over it. Just like in the case of speechify.”
“Extremely user friendly short keys. Placed forward backward and speed up down as Natural as it could be. Voices are great and smooth. I would recommend it over many hyped products.”
“At the very least it's better than many paid TTS models. Still not as good as ElevenReader or LAP, but maybe the best free model for TTS.”
“So glad I can finally switch voices! The default was fine but I found one I actually enjoy listening to for hours. Small thing, huge difference.”
“Best one i found, user friendly, and great voice over.”
“ChatGPT's long answers are finally listenable. Let it generate while I listen — doubles my productivity. Love the inline button next to each response.”
“I tried using this add-on to listen to an ebook on the O'Reilly learning platform, and it works smoothly. However, it always restarts from the first paragraph whenever I scroll or select a different paragraph. Please consider adding a bookmark or checkpoint feature so users can mark where the reading should begin.”
↪ Founder reply
Replied by CastReader founder Yan Xu within 48 hours: acknowledged the issue, shipped a bookmark feature in the following release. Reviewer's verbatim feedback drove the v1.2 roadmap.
“Need to highlight text and select it.”
“Hard to select text.”
↪ Founder reply
Replied by CastReader founder Yan Xu within 24 hours: apologized, asked which site/browser the issue occurred on, provided a workaround using the keyboard shortcut, and offered direct support at support@castreader.ai.
We re-test, re-write, and ship continuously. Every entry has a real date.
Rewrote landing pages with verbatim Chrome Web Store testimonials, real audiobook market data, and tested-12-extensions methodology. Every claim now has a sourceable link.
Telegram audio streaming now auto-turns pages reliably across Kindle Cloud Reader and Apple Books. Reduces session interruptions by ~70% in internal testing.
Wrote up the OCR pipeline: how CastReader handles Amazon's 184 random font alphabets and 361 unique glyphs per Kindle book. Shared in dev.to.
Native macOS app reads Kindle for Mac with word-level highlighting. Floating player + system-wide hotkeys. No browser needed.
Ranked #10 in Daily, 99 upvotes, 4 community comments shaped the v1.2 roadmap.
Switched from older TTS engines to Kokoro neural voices. User reviews shifted from 'usable but robotic' to 'enjoy listening for hours' (verbatim from review by patrick chiang).
OCR success rate improved from 78% to 89% on English-language Kindle books. Multi-column page detection added for academic PDFs.
I built CastReader because I owned hundreds of Kindle books and couldn't listen to them on my morning runs without buying separate Audible copies. The technical problem — Amazon's Cloud Reader font encryption — turned out to be solvable with OCR. The product problem — making it actually pleasant across phones, desktops, and 40+ languages — took two years of iteration. We're a small team. I answer every Chrome Web Store review personally (see testimonials above — including the 3-star and 1-star ones). If something's broken or missing, email support@castreader.ai.
— Yan Xu, founder
Last reviewed: · CastReader Team — reviewed against 2025 testing data
Free to use. No signup. Install and start listening.
★★★★★ 4.7 · Free to start · No login · Optional Pro