CastReader records 55,999 monthly visits with +9.8% month-over-month growth and Freemium pricing. OpenAI.fm records 358,988 monthly visits with +48% growth and Free pricing.
Read aloud webpages, PDFs, Kindle books and AI answers with synced highlighting
Hear OpenAI's text-to-speech voices in your browser, no setup required
| Dimension / Metric | | |
|---|---|---|
| Official Domain | castreader.com | openai.fm |
| Pricing Model | Freemium | Free |
| Monthly Visits | 56K (55,999) | 358.99K (358,988) |
| MoM Traffic Delta | +4.98K (+9.8%) | +116.4K (+48%) |
| Primary Market & Share | 🇺🇸 United States (56%) | 🇮🇳 India (41.5%) |
| Direct Visits / mo | 19.7K | 210.72K |
| User Rating | 4.4 | 4.6 |
| Supported Platforms | Website | Website |
Read aloud webpages, PDFs, Kindle books and AI answers with synced highlighting
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.
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.
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.
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.
Hear OpenAI's text-to-speech voices in your browser, no setup required
Pick from a roster of built-in voices ranging from bright and conversational to calm and narration-friendly, then hear the same line delivered differently.
Add a short natural-language direction such as "speak slowly and warmly" to influence tone, pace, and emotion without changing the script itself.
Paste a paragraph or a full script and stream the synthesized audio immediately, with no signup, install, or configuration step.
Switch voices, styles, and wording back-to-back to judge which combination fits a voiceover, audiobook, or product demo.
Offers vastly superior voice cloning and emotional range, but lacks the specific OpenAI voice preview playground layout.
Offers vastly superior voice cloning and emotional range, but lacks the specific OpenAI voice preview playground layout.
Free / Open-sourceProvides open-source studio-grade text-to-speech with instant voice cloning, but requires self-hosting or community web interfaces.
Free / Open-sourceProvides open-source studio-grade text-to-speech with instant voice cloning, but requires self-hosting or community web interfaces.
Focuses heavily on reading digital documents aloud and assistive listening, rather than raw speech generation testing.
Focuses heavily on reading digital documents aloud and assistive listening, rather than raw speech generation testing.
Free AI text to speech with 200+ voices in 70+ languages
Free AI text to speech with 200+ voices in 70+ languages
A straightforward free online text-to-speech converter, but offers less granular voice style and parameter tweaking.
A straightforward free online text-to-speech converter, but offers less granular voice style and parameter tweaking.
AI text to speech with 5,000+ realistic voices in 150 languages
AI text to speech with 5,000+ realistic voices in 150 languages
SpecialistVietnamese AI text-to-speech, voice cloning, and dubbing for creators
SpecialistVietnamese AI text-to-speech, voice cloning, and dubbing for creators
Converts pasted text into downloadable MP3s quickly, though lacking advanced AI voice design and emotion controls.
Converts pasted text into downloadable MP3s quickly, though lacking advanced AI voice design and emotion controls.
Listen to anything. Beautifully.
Listen to anything. Beautifully.
Includes robust voice cloning and podcast hosting tools, but is less focused on simple interactive voice testing.
Includes robust voice cloning and podcast hosting tools, but is less focused on simple interactive voice testing.
Natural AI text to speech with 910+ voices on web, iOS and Android
Natural AI text to speech with 910+ voices on web, iOS and Android
Turn any webpage, PDF, Doc or ebook into natural-sounding speech in 60+ languages
Turn any webpage, PDF, Doc or ebook into natural-sounding speech in 60+ languages
