CastReader vs Synapse

ON IPHONE AND IPAD One app for both devices, with iPad layouts for portrait, landscape and resizable windows. CastReader turns any text into something you can hear and understand. LISTEN TO YOUTUBE — HEAR PUBLIC TRANSCRIPTS Paste or share a public YouTube video link. When a public transcript is available, CastReader reads the caption text aloud with its own voices, synchronized highlighting, and automatic scrolling. CastReader does not play, download, save, or convert the original video or audio. Availability depends on the video’s public captions and your region. READ ALOUD — STAY FOCUSED Turn photos, web pages, PDFs, EPUBs, documents, and books into natural speech. Synchronized highlighting and automatic scrolling keep your eyes and ears on the same sentence while you study, commute, exercise, or rest your eyes. AI EXPLAIN — GO BEYOND THE WORDS CastReader creates and reads a clear explanation while handwritten-style annotations appear on the original: highlights for key points, circles around important terms, and numbered steps. BRING YOUR OWN CONTENT • Camera or photo: recognize text on-device • Web: open a URL and start listening • Files: PDF, EPUB, TXT, DOCX, and images • Paste: turn copied text into speech instantly CONNECT YOUR READING SERVICES • Kindle and WeRead: connect your library and continue reading • Google Play Books and Kobo: sync eligible shelf items, then read aloud or explain them page by page • O’Reilly Learning: use a supported personal account or eligible institution/library access, sync eligible books from reading history, and listen to or explain long chapters You use your own accounts and content access. Availability varies by provider, region, account, and institution. CastReader does not provide or sell book content. BUILT FOR • Readers who prefer to finish articles, documents, and ebooks by listening • Language learners who want synchronized visual guidance • Students and professionals working through dense material • Anyone who needs eye relief or accessibility support 9 LANGUAGES The interface and text-to-speech support English, Chinese, Japanese, Spanish, French, German, Brazilian Portuguese, Italian, and Hindi. Voice availability varies by language. CASTREADER PRO Use CastReader free every day. Upgrade to Pro for unlimited read-aloud time, unlimited AI explanations, all premium voices, and playback speeds up to 3x. Eligible new subscribers can try Pro free for 7 days. Regular voices do not use the cloned-voice allowance. Pro includes 120 minutes per month for generating audio with cloned voices, including curated, personal and shared voices. Previews and replaying already generated audio do not use this allowance. Dark mode and background playback are supported. Photo text recognition happens on-device and photos are not uploaded. CastReader’s local reading history stays on your device. Connected services retain their own account and reading data under their respective policies. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Most apps are built to keep you scrolling. Synapse is built to make you stop, just once a day. It gives you a single fact, carefully written and drawn from the deepest corners of science and history. No feed, no infinite scroll, just one idea worth carrying with you, delivered whenever you choose. These are not trivia. Each fact is a small story: the slow evaporation of black holes, declassified Cold War experiments, animals that bend the laws of physics, words that carry the fingerprints of ancient civilizations. Written to be read in a minute, and remembered far longer. Ten worlds to explore: • Abysses & Cosmos: the physics of deep space and the ocean floor • Dark History: real, documented, and deliberately forgotten • Biohacking: the science of pushing human biology to its limits • Mind & Neuroscience: the strange architecture of perception • Weird Fauna: evolution's most brutal and brilliant solutions • Future Tech: what tomorrow's labs are building today • Etymology Lab: words as archaeological artifacts • Megastructures: impossible engineering, ancient and future • Geopolitics: borders that defy logic • Daily Science: the deep laws hidden in ordinary moments A streak grows with every day you show up, and when life gets in the way a shield protects what you have built, so a single missed day never erases weeks of curiosity. Every fact also carries a rarity, so the more you read, the richer your collection becomes: a private map of everything you have learned. Curiosity is better when it travels. Follow friends, compare streaks on the leaderboard, and share the facts that move you. Synapse asks for one minute a day. What you do with the idea is up to you.