Prism Notes vs Readium
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Prism Notes
Capture thoughts and links quickly with a familiar texting interface. Organize ideas with AI-suggested tags and develop them across linked threads. Review notes to keep what matters and easily search by keyword or meaning.
- Texting-like note capture
- AI-suggested tags
- Threaded idea development
- Review mode for notes
- Sync across devices
- Natural language reminders
- Lock screen capture
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Prism is the private place for quick thoughts and links. It feels like texting, rather than writing in a document. Capture easily, organize with tags, develop ideas across threads, review to keep only what matters. Free to try! Features: - Private and on-device - Opt in to iCloud sync between iPhone and Mac - Voice transcription and voice memos - Lock screen widgets for text and voice capture - AI-suggested tags to make organizing easy or automatic AI tagging (requires apple intelligence) - Review mode to keep notes alive or let them go - Threads to evolve a thought and link them together - Search by keyword - Natural language reminders - just say "remind me tomorrow at 2pm" (requires apple intelligence)
Readium
Transform any text document, PDF, or web article into a natural-sounding audiobook. Follow along with highlighted words in real-time for improved focus and recall. Offers lifelike AI voices and offline playback for a private, distraction-free reading experience.
- Text-to-speech audiobook conversion
- Real-time word highlighting
- Lifelike AI and offline voices
- Distraction-free reader with themes
- Background playback with lockscreen controls
- Supports EPUB, PDF, MOBI, and web articles
- Adjustable playback speed
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Turn any book, PDF, or web article into a natural-sounding audiobook — and follow every word as it's read aloud. Lifelike voices, online or offline. Read faster, remember more. Readium reads your books, PDFs, articles, and documents out loud with beautiful, human-sounding voices — while highlighting each word in real time so your eyes and ears work together. It's the calm, private way to get through your reading list. WHY READIUM • Listen and follow along — real-time word highlighting keeps you focused and boosts recall • Lifelike AI voices plus built-in device voices that work fully offline • Beautiful, distraction-free reader — 4 themes (Light, Dark, Slate, Sepia) and reading fonts • Background playback with lockscreen media controls showing the book title and author • Adjustable speed, sentence skip, and a sleep-friendly experience • Thousands of classic books from Project Gutenberg — one tap to add to your library • Optimized for iPhone and iPad, including split-view multitasking IMPORT ANYTHING • EPUB, PDF, MOBI, AZW3, and FictionBook (FB2) • Plain text, Markdown, and HTML files • Web articles — browse to any page inside Readium and add it with a tap • Share sheet — send a link from Safari or any other app straight to your library • Rename titles and edit authors to keep your library tidy HOW IT WORKS 1. Import a book, PDF, or paste a web link 2. Pick a voice — a lifelike AI voice or a device voice that works offline 3. Press play and follow the highlighted words VOICES IN YOUR LANGUAGE English, Spanish, French, German, Portuguese, and Bangla — with more on the way. Preview any voice before you pick. GREAT FOR Commuters and multitaskers. Students and researchers. Readers with dyslexia, ADHD, or low vision. Anyone who wants a beautiful, listen-along reading experience. Reading, but faster — and finally enjoyable. Download Readium and start listening.
Screenshots
Verdict
The clearest difference is in-app purchases: Readium at none against Prism Notes's 2. Readium also leads on iOS requirement (16.4 vs 18.6). Prism Notes's advantage is ratings volume (33 vs 4) and device support (4 vs 2). On price, rating, review sentiment and update cadence there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Prism Notes sells 2 one-off in-app purchases. Readium asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 4.9 for Prism Notes against 5.0 for Readium. That said, the two scores are not equally well evidenced: Prism Notes has 33 ratings behind it against 4, so its average is the more settled of the two. Written reviews split almost evenly too, at 100% and 100% positive.
Prism Notes ships an update every 4 days, Readium every 6 days. The most recent releases landed on October 17, 2026 and October 15, 2026 respectively.
| Parameter | Prism Notes | Readium |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (33 ratings) | 5.0 (4 ratings) — better |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 33 — better | 4 |
| Update frequency | Every 4 days — better | Every 6 days |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free | Free |
| Devices | iPhone, iPad, Mac, Apple Watch — better | iPhone, iPad |
| Requires iOS | 18.6 | 16.4 — better |
| Further details — not scored | ||
| Size | 19 MB | 106 MB |
| Age rating | 4+ | 12+ |
| Developer | Tommy Joseph | Raquib Ul Alam |
Customer experience
Prism Notes
Readium
In-app purchases
Prism Notes
- Lifetime Unlock$6.99
- Lifetime Unlock$12.99
Readium
No in-app purchases









