AI responses are getting longer. A single ChatGPT-4o answer can easily hit 2,000 words. Claude's responses are even more detailed. At some point, you stop reading and start skimming — and that's where you miss things.
What if you could just listen instead?
The Problem: AI Writes More Than You Can Read
If you use ChatGPT, Claude, or Gemini regularly, you've hit this wall:
- You ask a complex question and get a 5-paragraph response
- You're coding and want to hear the explanation while looking at your editor
- You're on your third "explain this differently" prompt and your eyes are tired
These AI platforms have voice features in their mobile apps, but the web versions — where most serious work happens — have no text-to-speech at all.
The Solution: A Listen Button on Every AI Response
CastReader is a free Chrome extension that adds a small 🔊 button next to every AI response. Click it, and that specific response starts playing in a natural voice.
Not the whole conversation. Not the UI. Just that one response.
Supported Platforms
CastReader has dedicated extractors for six major AI platforms:
| Platform | What Gets Read | What Gets Skipped |
|---|---|---|
| ChatGPT | Assistant messages | User prompts, system UI |
| Claude | Response content | Thinking blocks, artifacts |
| Gemini | Model responses | Citations, UI elements |
| DeepSeek | Chat responses | Thinking chains |
| Kimi | Assistant messages | User input, UI |
| Doubao | Bot responses | Action buttons, UI |
Each extractor understands the platform's DOM structure. This isn't a generic "read everything on screen" tool — it knows what to read and what to skip.
How to Set It Up
- Install CastReader for Chrome (also works on Edge)
- Go to any supported AI platform (chatgpt.com, claude.ai, etc.)
- Ask the AI a question
- When the response appears, you'll see a 🔊 button
- Click it to start listening
That's it. No account, no API key, no configuration.
Why Per-Response Matters
Most TTS tools read the entire page. But AI conversations are back-and-forth — you don't want to hear your own prompts read back to you.
CastReader's per-response approach means:
- You choose what to listen to — skip responses you already understood
- No wasted time — you don't hear "User: Can you explain..." before every response
- Context-aware — code blocks are automatically skipped so you hear the explanation, not
const x = 42
Auto Language Detection
Ask ChatGPT a question in Chinese? CastReader detects the response language and automatically switches to a Chinese voice. English responses get English voices. No manual switching needed.
This works across all 40+ supported languages — not just English and Chinese.
Use Cases
Multitasking during AI work sessions: You're writing code in your editor. Claude gives you a long explanation of the architecture. Instead of switching windows to read it, you listen while you code.
Reviewing AI-generated content: You asked GPT-4o to write an article draft. Listening to it reveals awkward phrasing that reading missed — your ears catch what your eyes skip.
Learning and study: You're using Gemini to study a topic. Hearing the explanations while taking notes is more effective than reading and writing simultaneously.
Accessibility: For users with dyslexia, visual fatigue, or reading difficulties, listening to AI responses removes a significant barrier to using these tools effectively.
CastReader vs Built-in Voice Features
| Feature | ChatGPT Voice (Mobile) | CastReader (Web) |
|---|---|---|
| Platform | Mobile app only | Chrome/Edge browser |
| Cost | ChatGPT Plus ($20/mo) for advanced voice | Free |
| Per-response | No (conversation mode) | Yes |
| Highlighting | No | Yes, paragraph-level |
| Works on Claude | No | Yes |
| Works on Gemini | No | Yes |
| Works on DeepSeek | No | Yes |
Beyond AI: Works Everywhere
CastReader isn't just for AI platforms. It works on:
- Kindle Cloud Reader — the only extension that reads Kindle books aloud
- Medium articles — listen to stories and newsletters
- arXiv papers — hear research papers during your commute
- Any webpage — news, blogs, documentation
Get Started
Install CastReader and try it on your next ChatGPT or Claude session. The 🔊 button appears automatically — no setup needed.
FAQ
Does CastReader work with GPT-4o and Claude 3.5?
Yes. CastReader extracts from the rendered page, so it works with any model — GPT-4o, GPT-4, Claude 3.5 Sonnet, Claude 3 Opus, Gemini Pro, and all future models.
Is it really free?
Yes. No subscription, no usage limits, no API key, no account required. CastReader is completely free.
Does it read code blocks?
No. Code blocks are automatically skipped so you hear the natural language explanation, not code syntax.
Can I adjust the reading speed?
Yes. The floating player has speed controls from 0.5x to 2x. Your preference is saved across sessions.
Does it work on Claude's artifacts?
Artifacts (code, documents, etc.) are automatically excluded. Only the actual conversational response is read.