CastReader adds a Listen button next to every email subject. One click and it reads the email aloud with a natural AI voice — paragraph by paragraph, with highlighting that follows along.
CastReader detects when you open an email and adds a Listen button automatically
Open any email in Gmail and a small Listen button appears next to the subject line. No menus, no right-clicking, no toolbar buttons to find. It is right there where you are already looking — next to the email title.
CastReader extracts just the email content — no navigation, no sidebar, no signature blocks, no quoted reply chains. Long email threads? It reads only the current message, skipping the quoted history below.
Each paragraph highlights as it is read aloud. Click any paragraph to jump there. The page auto-scrolls to keep up. You always know exactly where the reading is.
Navigate to another email and the Listen button follows. Gmail is a single-page app — CastReader detects navigation changes and re-mounts the button on the new email subject line automatically.
Gmail does not have a built-in read-aloud feature. Google added smart features like Smart Reply, nudges, and AI summaries — but never text to speech. If you want to hear your emails read aloud, you need a browser extension.
Most read-page-aloud extensions struggle with Gmail because it is a complex single-page app. The DOM changes constantly as you navigate between emails, and the actual email body is buried inside layers of nested divs. Generic page readers end up reading the entire Gmail interface — navigation, labels, sidebar, and all — instead of just the email content.
CastReader solves this with targeted webmail detection. When it recognizes Gmail, it identifies the email subject line and inserts a Listen button right next to it. When you click Listen, it extracts only the email body text — skipping quoted replies, signatures, and Gmail interface chrome. The extraction uses the same Visual Zone algorithm that powers CastReader content extraction on 10,000+ websites, tuned specifically for email content patterns.
The Listen button follows Gmail SPA navigation. When you open a new email, the button re-appears on the new subject. When you go back to the inbox, it disappears. During playback, the button shows Listening so you know it is working. If Gmail re-renders the heading element (which it does during playback), CastReader preserves the playback state instead of creating duplicate buttons.
CastReader also works with Outlook.com, QQ Mail, and auto-detects other webmail platforms using ARIA roles and DOM heuristics. One extension covers all your email reading needs.
Everything about listening to Gmail emails
No. Gmail has no native text-to-speech feature. Google added AI summaries and Smart Reply but never built-in read aloud. You need a Chrome extension like CastReader to listen to Gmail emails.
Install CastReader from the Chrome Web Store. Open any email in Gmail — a Listen button appears next to the subject line. Click it. The email starts reading aloud with paragraph highlighting.
Just the email body. CastReader extracts only the email content, skipping Gmail interface, navigation, sidebar, and quoted reply history. You hear the actual message, not the chrome around it.
Yes. When you open an email in a thread, CastReader reads the currently visible email body. It skips the quoted reply chains and focuses on the actual new content.
CastReader is a Chrome/Edge extension that works on desktop. For mobile, you can use your phone built-in accessibility features — iOS has Speak Screen and Android has Select to Speak.
Yes. CastReader also supports Outlook.com, QQ Mail, and auto-detects other webmail platforms. The same extension works across all your email accounts.
Yes — CastReader is free to use, no signup. CastReader Pro (optional) adds premium ultra-realistic voices, more listening hours, voice cloning, and AI document analysis.
CastReader supports 40+ languages with natural AI voices. It auto-detects the language of your email content and uses the appropriate voice.
Yes. CastReader works on any mail.google.com domain, including Google Workspace accounts for business and education.
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