# CastReader vs SpeakGPT CastReader records 55,999 monthly visits with +9.8% month-over-month growth and Freemium pricing. SpeakGPT records 0 monthly visits with — growth and Free pricing. | Metric | [CastReader](https://openaitools.app/tool/castreader) | [SpeakGPT](https://openaitools.app/tool/speakgpt) | | :--- | :--- | :--- | | Website URL | https://castreader.com | https://chromewebstore.google.com/detail/speakgpt/bpmbhogdhpofgbmoobbfljkbhamhdamg | | Categories | AI Text-to-Speech, AI Speech Synthesis, AI Reader | AI Text-to-Speech, AI Chatbot, AI Voice Generator, Large Language Models (LLMs) | | Pricing Model | Freemium | Free | | Monthly Visits | 55,999 | 0 | | MoM Growth Rate | +9.8% | — | | Primary Market | United States | Global | | Direct Visits | 19,699 | 0 | | Review Score | 4.4 | 3.2 | | Saved Count | 0 | 0 | | Supported Platforms | Website | Browser Extension | ## CastReader CastReader is built for people who want to consume long-form text with their ears as well as their eyes. Once installed as a Chrome or Edge extension, or opened as an iPhone, iPad or Android app, it reads supported pages and documents aloud using natural AI voices while a word-synced highlight and auto-scroll keep your place. A public Voice Hub lets you preview real voice samples by language before committing, and playback speed ranges from standard rates up to 3x on the paid plan. What separates it from a plain screen reader is a feature called Read & Explain. Instead of only pronouncing a dense or foreign-language paragraph, CastReader works out what it means and walks you through it in the language you know best, while an animated pen circles and underlines the relevant lines in the original text. That mix of eyes-on-page and ears-on-explanation is aimed at research papers, technical documentation, foreign-language news and other long reads where passive narration is not enough. Sources are organised into four families: book platforms such as Kindle, WeRead, Google Play Books, Libby, Kobo and O'Reilly; articles and subscriptions including Medium, Substack, The Atlantic, The New Yorker and major newspapers; work documents and email such as Google Docs, Notion, Gmail and Google Drive; and AI conversations from ChatGPT, Claude, Gemini, DeepSeek and Kimi. CastReader also offers private voice cloning for your own documents and a developer Voice API for embedding cloned speech into applications. Free use needs no account, and payments are handled by Stripe. **Pricing & Plans:** Freemium. Free plan: $0 forever with 20 minutes of listening per day, standard voices up to 1.25x speed, 3 AI explains per day, and 30,000 translation characters per day when signed in. Pro: $4.99/month or $35.99/year (about $3/month, 40% saving) removing the daily listening cap, unlocking full ebooks and long PDFs, more premium voices up to 3x speed, unlimited daily explains, 120 personal-voice minutes per membership month, and 3,000,000 translation characters per month. A 3-day free trial is available; billing is via Stripe. - **Synced read-aloud:** Natural AI voices narrate webpages, PDFs, ebooks and documents while each spoken word is highlighted and the page auto-scrolls, so you never lose your place. - **Read & Explain:** Instead of only reading a hard passage, CastReader summarises and unpacks its meaning in the language you know best, with an animated pen marking the key lines in the original text. - **Wide source coverage:** Works across Kindle, WeRead, Google Play Books, O'Reilly and other book platforms, news and newsletter sites, Google Docs, Notion, Gmail, plus ChatGPT, Claude, Gemini, DeepSeek and Kimi answers. - **Voice Hub and voice cloning:** Preview real samples of dozens of voices across many languages, and create private cloned voices that Pro members can apply to their own PDF, EPUB, Word and TXT files. - **Developer Voice API:** A REST API for text-to-speech and private voice cloning in 10 languages, returning MP3 or WAV, priced at $8 per 1M characters for successful generations. **Strengths:** Combines plain read-aloud with guided explanations that point back at the source text; Covers an unusually broad set of sources, from Kindle and Gmail to ChatGPT and Claude answers; Free tier is genuinely usable with no account required, and the 3-day Pro trial needs no commitment; Personal voice cloning and a pay-per-success Voice API extend it beyond a simple reader **Limitations:** The 20-minute daily listening cap on the free plan runs out quickly for long books or PDFs; Source support and iOS previews vary by platform, browser version and content access rules; Applying a cloned voice to your own text is limited to 120 minutes per membership month even on Pro [Profile (Markdown)](https://openaitools.app/tool/castreader.md) ## SpeakGPT SpeakGPT addresses a simple annoyance: the official ChatGPT web interface is text-first, so every question has to be typed. This extension installs a small toolbar layer and a dedicated talk page that add speech recognition and text-to-speech on top of the site you already use. You click the microphone, speak, and the transcript is submitted as a prompt; the answer is then spoken back through the browser's speech engine. Because it operates on your own logged-in ChatGPT session, there is no separate account, no API key to configure in the basic flow, and no second chat history to manage. The extension exposes a small options page where you can choose the playback voice, set the recognition language code, and paste or validate a token. Voice choice matters more than it sounds: picking a language-matched voice and recognition code is what makes dictation usable for non-English speakers. A TikTok-style voice option is included for people who want a more playful read-aloud tone, and the same Chromium extension can be side-loaded into Kiwi Browser so the microphone flow also works on Android phones. SpeakGPT is a hobby-scale tool. The Chrome Web Store listing shows a tiny install base and a single rating, updates are infrequent, and the extension is distributed as-is by an individual developer. It also offers in-app purchases, so treat it as freemium rather than strictly free. If you need a polished, supported voice product, look at OpenAI's own voice modes or a larger commercial dictation tool; if you just want a free talking interface for the web chat, SpeakGPT is a reasonable experiment. **Pricing & Plans:** Free to install from the Chrome Web Store, with in-app purchases available — treat it as freemium rather than fully free. A ChatGPT account is required to use the underlying chat, and ChatGPT Plus is not a prerequisite per the listing. - **Voice input for ChatGPT:** A microphone button captures your speech and submits it as a prompt, so you can drive the web chat without typing. - **Spoken replies with text-to-speech:** Answers are read aloud through the browser's speech engine, letting you listen instead of reading long responses. - **Custom voice and language settings:** An options page lets you pick the playback voice and set the recognition language code so dictation matches how you actually speak. - **TikTok voice option:** A novelty voice preset gives replies a trendier read-aloud style for casual or content-creation use. - **Works on mobile via Kiwi Browser:** The same extension can be installed in Kiwi Browser on Android, so the voice chat flow carries over to phones. **Strengths:** Free to add from the Chrome Web Store, with no separate account beyond your ChatGPT login; Adds both speech input and spoken playback, so the loop is fully hands-free; Configurable voices, recognition language codes, and a token validation step; Can be side-loaded into Kiwi Browser for Android use **Limitations:** Tiny user base and a single store rating, so reliability is hard to gauge; Last listing update was mid-2024, so it may lag behind changes to the ChatGPT web interface; Requires you to be logged into the ChatGPT website, and heavy dependency on that page's markup can break at any time [Profile (Markdown)](https://openaitools.app/tool/speakgpt.md) ## Frequently Asked Questions ### How do CastReader and SpeakGPT compare in monthly traffic? CastReader has 55,999 monthly visits, while SpeakGPT has 0. Traffic estimates describe audience size, not product quality. ### How do their growth rates compare? CastReader has a month-over-month growth rate of +9.8%; SpeakGPT has —. ### How does pricing compare? CastReader: Freemium. Freemium. Free plan: $0 forever with 20 minutes of listening per day, standard voices up to 1.25x speed, 3 AI explains per day, and 30,000 translation characters per day when signed in. Pro: $4.99/month or $35.99/year (about $3/month, 40% saving) removing the daily listening cap, unlocking full ebooks and long PDFs, more premium voices up to 3x speed, unlimited daily explains, 120 personal-voice minutes per membership month, and 3,000,000 translation characters per month. A 3-day free trial is available; billing is via Stripe. SpeakGPT: Free. Free to install from the Chrome Web Store, with in-app purchases available — treat it as freemium rather than fully free. A ChatGPT account is required to use the underlying chat, and ChatGPT Plus is not a prerequisite per the listing. ## Alternatives | # | Tool Name | Monthly Visits | MoM Growth Rate | Pricing Model | Summary | Profile (Markdown) | | :--- | :--- | :--- | :--- | :--- | :--- | :--- | | 1 | [ElevenLabs](https://openaitools.app/tool/elevenlabs-io) | 42,396,771 | +26.1% | Freemium, Paid, Contact for Pricing | AI audio platform for speech, agents, music and dubbing | [.md](https://openaitools.app/tool/elevenlabs-io.md) | | 2 | [Speechify](https://openaitools.app/tool/speechify) | 5,457,475 | +0.5% | Freemium | Text to speech and voice AI across every device | [.md](https://openaitools.app/tool/speechify.md) | | 3 | [Luvvoice](https://openaitools.app/tool/luvvoice-free-text-to-speech) | 1,438,923 | -8.2% | Freemium | Free AI text to speech with 200+ voices in 70+ languages | [.md](https://openaitools.app/tool/luvvoice-free-text-to-speech.md) | | 4 | [Peech: Text to Speech Reader](https://openaitools.app/tool/peech-text-to-speech-reader) | 353,093 | -26% | Freemium | Listen to anything. Beautifully. | [.md](https://openaitools.app/tool/peech-text-to-speech-reader.md) | | 5 | [Voice Out](https://openaitools.app/tool/voice-out) | 39,679 | -27.1% | Freemium | Turn any webpage, PDF, Doc or ebook into natural-sounding speech in 60+ languages | [.md](https://openaitools.app/tool/voice-out.md) | | 6 | [Audeus: Text to Speech Reader](https://openaitools.app/tool/audeus-text-to-speech-reader) | 32,118 | -37.8% | Freemium, Free Trial | Turn PDFs, docs and web pages into natural-sounding audio you can listen to anywhere | [.md](https://openaitools.app/tool/audeus-text-to-speech-reader.md) | | 7 | [GPT Reader & Transcriber](https://openaitools.app/tool/gpt-reader-a-free-ai-text-to-speech) | 29,995 | -16% | Free | Free ChatGPT-style text-to-speech and speech-to-text in your browser | [.md](https://openaitools.app/tool/gpt-reader-a-free-ai-text-to-speech.md) | | 8 | [Read Aloud Reader](https://openaitools.app/tool/read-aloud-reader) | 28,361 | +87.7% | Freemium | Free browser text-to-speech with natural neural voices | [.md](https://openaitools.app/tool/read-aloud-reader.md) | | 9 | [MacGPT](https://openaitools.app/tool/macgpt) | 26,224 | -7.5% | Freemium | ChatGPT in your Mac menu bar, inline and everywhere | [.md](https://openaitools.app/tool/macgpt.md) | | 10 | [Readio](https://openaitools.app/tool/readio-1) | 12,402 | +6.7% | Freemium | Listen to PDFs, ebooks, and webpages in natural AI voices with synced highlighting. | [.md](https://openaitools.app/tool/readio-1.md) | --- Source: https://openaitools.app/compare/castreader-vs-speakgpt More Markdown: [Categories](https://openaitools.app/categories.md) · [Traffic rankings](https://openaitools.app/rankings.md) · [llms.txt](https://openaitools.app/llms.txt)