A small ๐ Listen button appears next to every Google Gemini response. Click to hear just that answer โ no copying, no switching apps. Auto language detection, natural voices.
The only Chrome extension that adds a Listen button to every Gemini response
Every response from Gemini gets its own ๐ Listen button. Click it to hear only that answer โ not the entire conversation. Perfect for long research responses you'd rather listen to than read.
Gemini uses Shadow DOM to render chat content โ most TTS extensions can't read it. CastReader has dedicated deep-query support for Gemini's DOM structure, so the button appears reliably on every response.
CastReader detects the response language automatically. Whether Gemini answers in English, Chinese, Japanese, or any of 40+ languages, you get a matching natural voice โ powered by the Kokoro TTS model.
Everything about listening to Google Gemini with CastReader
Install CastReader, go to gemini.google.com, and a ๐ Listen button will appear next to every Gemini response automatically. Click it to start listening to just that response.
Gemini renders chat content inside Shadow DOM, which is invisible to normal querySelector calls. CastReader uses deep Shadow DOM traversal specifically for Gemini, so it reliably reads every response.
Yes. CastReader extracts from the rendered page, so it works with all Gemini model versions including Advanced, 2.0, and Flash.
Code blocks are skipped by default so you hear the explanation, not the syntax. Technical Gemini responses become much easier to listen to.
Yes โ CastReader is free to use, no API key, no account required. CastReader Pro (optional) adds premium ultra-realistic voices, more listening hours, voice cloning, and AI document analysis.
Yes. CastReader also supports ChatGPT, Claude, DeepSeek, Kimi, and Doubao with dedicated extractors for each platform.
Yes. CastReader works on the entire gemini.google.com domain, including Gemini Advanced (Gemini 2.0 Pro). The ๐ button appears next to every response regardless of which model you are using.
Yes. CastReader is a free Chrome extension that adds a Listen button to every Gemini response. Unlike generic Chrome read-aloud extensions that read the entire page, CastReader lets you pick a single Gemini reply and skip system instructions or your own prompts.
Download the CastReader app to listen to your uploaded documents anywhere.
Hard numbers โ not vibes โ from authoritative sources
$2.22 billion
US audiobook sales in 2024, up 13% year-over-year (Publishers Weekly / Audio Publishers Association)
Source โ51%
of US adults have listened to an audiobook in 2025 โ roughly 134 million people (APA Consumer Survey 2025)
Source โ2.2 billion
people globally with near- or far-vision impairment (WHO Fact Sheet, 2024). TTS is the primary access path for digital reading content.
Source โ78%
of audiobook listeners multitask while listening โ commute, chores, exercise (Audiolibrix Great Audiobook Survey, 2024)
Source โ27.2 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 โeffect 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 โ15.5 million
US adults with ADHD per CDC 2024 โ about half diagnosed in adulthood (CDC MMWR, October 2024)
Source โEvery Chrome Web Store review below is verifiable at the link in each card. We don't hide negative feedback โ we answer it within 24 hours.
โThis 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.โ
โWorks 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.โ
โExtremely 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.โ
โAt 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.โ
โSo 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.โ
โBest one i found, user friendly, and great voice over.โ
โChatGPT's long answers are finally listenable. Let it generate while I listen โ doubles my productivity. Love the inline button next to each response.โ
โI 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.โ
โช 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.
โNeed to highlight text and select it.โ
โHard to select text.โ
โช 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 โ Amazon's Cloud Reader font encryption โ turned out to be solvable with OCR. The product problem โ making it actually pleasant across phones, desktops, and 40+ languages โ took two years of iteration. We're a small team. I answer every Chrome Web Store review personally (see testimonials above โ including the 3-star and 1-star ones). If something's broken or missing, email support@castreader.ai.
โ Yan Xu, founder
Last reviewed: ยท CastReader Team โ reviewed against 2025 testing data
Free to use. No signup. Install and start listening.
โ โ โ โ โ 4.7 ยท Free to start ยท No login ยท Optional Pro