ChatGPT's built-in Read Aloud plays one reply in a stock voice. CastReader goes further: a Listen button on every response, natural AI voices in 40+ languages, highlighting that follows the audio โ and the same reader on Claude, Gemini, DeepSeek and Kimi.
Built for how you actually use AI chat
CastReader adds a small Listen button next to each individual ChatGPT reply. Click it to hear just that answer โ not the whole conversation. No text selection, no copy-pasting into a separate TTS tab.
ChatGPT's own Read Aloud stays inside ChatGPT. CastReader gives you the identical button, voices and controls on Claude, Gemini, DeepSeek, Kimi and Doubao โ your listening workflow never changes.
A dedicated ChatGPT extractor identifies assistant messages and skips navigation, sidebars and system text. Code blocks are skipped automatically, so a coding answer doesn't turn into minutes of spoken brackets.
Each paragraph lights up as it's read and the page auto-scrolls to keep pace. Click any paragraph to jump straight there and replay the step you missed.
Powered by the Kokoro TTS model โ natural, expressive voices, not robotic spelling. The voice matches the reply's language automatically, and you pick the one that suits hours of listening.
Long answer but you have to leave? Send it to your phone with one click and keep listening in the CastReader app from the same spot.
Install and listen right away โ standard voices are free with no signup. CastReader Pro adds premium ultra-realistic voices, more listening hours, voice cloning and AI document analysis.
Add the free extension from the Chrome Web Store โ no account, no API key. Works in Chrome and Edge.
A small ๐ Listen button appears next to every response automatically โ in new chats and old ones.
The reply is read in a natural AI voice while each paragraph highlights in sync. Click any paragraph to jump; set 1.5โ2ร speed when reviewing.
One click sends the audio to the CastReader app on iOS or Android, picking up from the same paragraph.
ChatGPT has had a built-in Read Aloud feature since 2024: tap the speaker icon under a reply on chatgpt.com or in the mobile apps, and an OpenAI stock voice plays that answer back. For a sentence or two it's perfectly fine โ so an honest ChatGPT reader has to start by admitting it exists, then explain when you'd want more.
The gaps show up as answers get long. Built-in Read Aloud plays one reply at a time in a small set of voices, with no text highlighting โ drift for ten seconds and you've lost your place in an 800-word explanation. Voice Mode doesn't fill the gap either: it's a conversational mode for talking with ChatGPT, not a reader that walks through a long written answer verbatim. And it stays inside ChatGPT โ on Claude or Gemini you're back to silent text.
CastReader treats listening as a layer for the whole AI-chat era rather than a feature of one product. The same ๐ button appears on every response across ChatGPT, Claude, Gemini, DeepSeek, Kimi and Doubao. A dedicated extractor for chatgpt.com reads assistant messages and ignores the interface; code blocks are skipped automatically so technical answers stay listenable. Each paragraph highlights as it's spoken, you click to jump, and 40+ languages of natural AI voices keep mixed-language conversations pronounced properly.
In practice this changes how long answers get used. Deep-research replies and study guides become something you absorb while pacing, eyes free to catch the highlighted line when a detail matters. Drafts ChatGPT wrote for you โ emails, essays, scripts โ get the read-it-back test: awkward phrasing your eyes forgive is impossible to miss by ear.
Everything you need to know about listening to ChatGPT with CastReader
Install the free CastReader Chrome extension and open chatgpt.com. A ๐ Listen button appears next to every response automatically โ click it and that reply is read aloud with paragraph highlighting.
Yes โ since 2024 ChatGPT has built-in Read Aloud on the web and in the mobile apps (the speaker icon under a reply). CastReader is for when you want more than playback: synced paragraph highlighting, click-to-jump, 40+ language voices to choose from, send-to-phone, and the same experience on Claude, Gemini, DeepSeek and Kimi.
Voice Mode is a conversation โ you talk, ChatGPT answers in its own spoken words. CastReader (like Read Aloud) speaks the written reply on screen, word for word โ what you want for long explanations, drafts and study guides.
Yes. The per-response ๐ button plays a single answer; clicking the CastReader extension icon reads the conversation extracted from the page, and you can click any paragraph to start there.
By default CastReader reads assistant (ChatGPT) messages. The extractor filters out user prompts and system UI so you hear the content, not the scaffolding.
Yes. CastReader reads the rendered page, so it works no matter which model generated the response โ including new models as OpenAI ships them.
They're skipped automatically. A coding answer reads as the explanation around the code โ the highlight shows where you are, so your eyes take over at the snippet.
40+ languages with natural AI voices. The voice matches the reply's language automatically, mixed-language chats are fine, and you can choose the voice you like best.
Yes โ CastReader has dedicated extractors for Claude, Gemini (through its Shadow DOM), DeepSeek (skipping the deep-thinking chain), Kimi and Doubao.
Use Send to Phone: start playback on desktop, click once, and the audio continues in the CastReader iOS or Android app from the same spot.
Free to start โ standard voices with no signup and no API key. CastReader Pro (optional) unlocks premium ultra-realistic voices, more listening hours, voice cloning and AI document analysis.
CastReader reads the text on the page you're viewing and sends it to our voice API to generate audio. We don't store your conversation content and we never access your ChatGPT account.
One-click listen button for ChatGPT, Claude, Gemini, DeepSeek & more
Read Claude AI conversations aloud with natural voices
Works through Google Gemini's Shadow DOM
Skips the deep-thinking chain automatically
Including Moonshot Kimi share pages
ByteDance Doubao with natural Chinese voices
Generate natural AI voices for any text
Paste any text and listen instantly
Press Quickread and have the page explained in your language โ key points marked by a moving pen
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 start, no signup โ upgrade to CastReader Pro for premium voices and more listening hours. Install and put a Listen button on every AI reply.
โ โ โ โ โ 4.7 ยท Free to start ยท No login ยท Optional Pro