CastReader records 55,999 monthly visits with +9.8% month-over-month growth and Freemium pricing. Gizmo records 9,273,984 monthly visits with +18.2% growth and Freemium pricing.
Read aloud webpages, PDFs, Kindle books and AI answers with synced highlighting
AI flashcards that turn note dumps and PDFs into addictive quiz sessions
| Dimension / Metric | | |
|---|---|---|
| Official Domain | castreader.com | gizmo.ai |
| Pricing Model | Freemium | Freemium |
| Monthly Visits | 56K (55,999) | 9.27M (9,273,984) |
| MoM Traffic Delta | +4.98K (+9.8%) | +1.42M (+18.2%) |
| Primary Market & Share | 🇺🇸 United States (56%) | 🇵🇭 Philippines (31.3%) |
| Direct Visits / mo | 19.7K | 5.7M |
| User Rating | 4.4 | 4.3 |
| 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.
AI flashcards that turn note dumps and PDFs into addictive quiz sessions
Turn notes, PDFs, PowerPoint slides and YouTube videos into ready-to-quiz flashcards without writing cards by hand.
Automatic scheduling resurfaces cards right before you would forget them, so review time goes where it is needed.
Answer-first quizzing with instant feedback instead of passive re-reading, reinforcing long-term retention.
Streaks, points and social study sessions keep motivation high and make daily review a habit.
SpecialistShare and access study materials worldwide — with AI study tools built in
SpecialistShare and access study materials worldwide — with AI study tools built in
Text to speech and voice AI across every device
Text to speech and voice AI across every device
Offers robust flashcard creation and practice tests, but with a stronger focus on free study tools.
Offers robust flashcard creation and practice tests, but with a stronger focus on free study tools.
Provides comprehensive AI tutoring and course material conversion, but features a more structured video-explainer interface.
Provides comprehensive AI tutoring and course material conversion, but features a more structured video-explainer interface.
Free AI text to speech with 200+ voices in 70+ languages
Free AI text to speech with 200+ voices in 70+ languages
Converts course materials into flashcards and mind maps, though its interface emphasizes visual conceptual learning over gamification.
Converts course materials into flashcards and mind maps, though its interface emphasizes visual conceptual learning over gamification.
SpecialistTurn any material into visual study sets, flashcards and quizzes
SpecialistTurn any material into visual study sets, flashcards and quizzes
Excels at summarizing extensive lecture notes and videos into study guides, though its flashcard gamification is simpler.
Excels at summarizing extensive lecture notes and videos into study guides, though its flashcard gamification is simpler.
Transforms various notes and videos into structured summaries and quizzes, offering a clean, straightforward study experience.
Transforms various notes and videos into structured summaries and quizzes, offering a clean, straightforward study experience.
Specializes in converting study files directly into Anki-compatible decks, ideal for dedicated spaced-repetition users.
Specializes in converting study files directly into Anki-compatible decks, ideal for dedicated spaced-repetition users.
Listen to anything. Beautifully.
Listen to anything. Beautifully.
Free AI study partner that turns your course material into practice questions, guides and flashcards
Free AI study partner that turns your course material into practice questions, guides and flashcards
