Strobe vs Lumen Reader
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Strobe
This app helps you read faster by displaying words one at a time in a fixed location. It offers an audio narration option and customizable reading settings. Import your own documents or share articles to enhance your reading speed and comprehension.
- Rapid Serial Visual Presentation (RSVP)
- Adjustable reading speed (100-1000 WPM)
- Read aloud with natural voice narration
- Import PDF, EPUB, TXT, and Markdown files
- Share articles from Safari
- Customizable timing and punctuation pauses
- iCloud Sync across devices
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Speed read your own books and documents, one word at a time, or listen as a natural voice reads along. No ads, no subscription, no account. Strobe is a speed reading app for iPhone, iPad, and Mac. It uses Rapid Serial Visual Presentation (RSVP): each word appears in the same spot on screen, so your eyes stay still instead of scanning across lines. Import a PDF, EPUB, plain-text, or Markdown file, share an article from Safari, or paste text, then read at 100 to 1,000 words per minute. HOLD TO READ • Press and hold to read. Let go to pause. • Slide up or down while you read to change speed without losing your place. • Swipe sideways while paused to step word by word. • Touch with two fingers to keep reading after you let go, or switch to tap to play. READ ALOUD • A natural voice reads along as the words show, at up to 450 words per minute. • Choose from 15 English voices, American and British. • The voice downloads once and runs on your device, even offline. • Keep listening with the screen locked, and play or pause from the Lock Screen or headphones (iOS 27 or later, and Mac). TIMING THAT FOLLOWS THE TEXT • The speed you set is your real speed, with every pause and slowdown counted. • Smart Timing keeps longer words on screen a little longer. • Punctuation Pauses slow down at sentence ends, commas, dashes, ellipses, and closing quotes, and you set the length of each. • Complexity Timing speeds up simple words and slows down complex ones, each by as much as you choose. • Acronyms and hyphenated words get extra time automatically. • Blank After Sentences adds an optional moment of empty screen between sentences. A FIXED POINT FOR YOUR EYES • Each word lines up on a highlighted focus letter, its Optimal Recognition Point (ORP), in red or one of six other colors. • Show the previous word, the next word, or both, as faintly as you like. • An open quote or parenthesis stays faintly above the word until it closes. • Pop Words In springs each word in, like video captions. YOUR LIBRARY • Every document gets a cover, and Continue Reading takes you back to your exact word. • EPUB tables of contents and PDF bookmarks become chapters, each with its reading time at your speed. • Open the full text with your place highlighted, search for any word or phrase, and tap a word to resume from there. • Page numbers, running headers, and footers are removed on import. • Chinese, Japanese, and Korean text is split into words, and Arabic keeps its connected letterforms. • iCloud Sync keeps your library, places, and speeds the same on iPhone, iPad, and Mac. • Statistics show your time and words read, average session, and real speed. BEYOND THE APP • Share articles and links from Safari and other apps straight into your library. • A Continue Reading widget for your Home Screen, Lock Screen, and Mac desktop. • Siri and Shortcuts can continue reading, open a document, tell you your progress, or speed read any text. MAKE IT YOURS • Seven fonts, adjustable text size, four text tones, and seven highlight colors. • A true black background for OLED screens and reading in the dark. • Every document remembers its own speed. • Keyboard shortcuts on Mac and iPad: Space to read, arrow keys to step, ⌘N for new text, ⌘O to import. • Works with VoiceOver, Larger Text, and Reduce Motion. PRIVATE BY DESIGN Strobe has no account, ads, analytics, or tracking. Your documents stay on your device, and with iCloud Sync, in your own private iCloud, encrypted. The voice runs on your device, so no text is sent away to be read aloud. FREE AND OPEN SOURCE Strobe is free, with no subscription or in-app purchases. The source code is public on GitHub under the Apache 2.0 license. Strobe can't import DRM-protected EPUBs or password-protected PDFs. Reading aloud is for English text, on every Mac and on iPhone and iPad models with 4 GB of memory or more.
Lumen Reader
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Lumen Reader turns any webpage, EPUB, PDF, or DOCX into a clean audiobook with on-device narration, lock-screen controls, and word-by-word highlights. Paste a link, tap Listen — no ads, no account, no subscription. PASTE A LINK. GET AN AUDIOBOOK. Found a 10,000-word essay you'd never sit down to read? An hour-long blog post? A web-novel chapter buried under five ad slots? Paste the URL into Lumen. The page is stripped of pop-ups, trackers, cookie walls, newsletter dialogs, and "related articles" carousels — then handed to a natural narrator that starts reading aloud while you keep walking, cooking, or driving. POCKET AUDIO PLAYER Lumen feels like a podcast app, not a reading app, when you want it to. The big Listen button is on every book and every imported article. Lock-screen controls let you play, pause, scrub, skip back 15 s, or jump chapter without unlocking your phone. AirPods double-tap, CarPlay, Dynamic Island, and Bluetooth headphones all work out of the box. Background audio keeps the narrator going when the screen is off. OR READ INSTEAD The same content is also a beautifully typeset, minimalist reader. Three themes (Dark, Sepia, Light) and four type families (Georgia serif, sans, rounded, OpenDyslexic) tuned for multi-hour sessions. Sentence-granular highlights in five colours, per-chapter bookmarks, and a notes catalog searchable across every book. A soft amber word-highlight scrolls along the page in time with the audio when you read and listen at the same time. BUILT-IN LIBRARY Open the app and there's already something to read or listen to. A curated catalog of public-domain titles is one tap away: • The Holy Bible (King James Version) • The Holy Qur-ān (public-domain English translation) • The Bhagavad Gita • The Dhammapada · Tao Te Ching · Analects of Confucius • Meditations (Marcus Aurelius) · The Art of War · Walden • Pride and Prejudice · Frankenstein · Dracula · Moby-Dick • Sherlock Holmes · Alice in Wonderland · The Iliad & The Odyssey • …plus developer docs (Snowflake, Databricks) rendered on-device. Books download straight from canonical archives like Project Gutenberg in seconds — no account, yours forever. YOUR OWN FILES TOO Drop EPUB, PDF, DOCX, TXT, Markdown, or HTML in from Files, iCloud Drive, Dropbox, Google Drive, or OneDrive. Lumen parses chapters into the same clean reader and audiobook UI. ONE LIBRARY ON EVERY DEVICE iCloud syncs your reading progress, highlights, notes, and imported books across iPhone, iPad, Mac, and Apple Vision Pro — silently, with no login. Start a chapter on your phone, finish it on your iPad with the audio resuming at the exact word. OFFLINE BY DEFAULT Every page and audio session is generated on-device. Once a book is downloaded, you never need a signal to re-open it. PRIVACY No account. No analytics. No tracking. Highlights, notes, and progress stay in your own iCloud — never on our servers. The app talks only to the page you explicitly paste, or runs entirely offline against the bundled library. FINE PRINT Every catalog title is public domain or permissively licensed. Lumen does not bundle copyrighted prose and does not redistribute from its own servers — downloads go straight from the canonical archive to your device. For pages or files you import, you're responsible for the rights. Read it. Hear it. Pocket it.
Screenshots
Verdict
The clearest difference is iOS requirement: Strobe at 17.0 against Lumen Reader's 26.0. On price, update cadence, ads and in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
Strobe ships an update weekly, Lumen Reader every 4 days. The most recent releases landed on November 5, 2026 and October 31, 2026 respectively.
| Parameter | Strobe | Lumen Reader |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (8 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 8 — better | — |
| Update frequency | Weekly | Every 4 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, Mac — better | iPhone, iPad |
| Requires iOS | 17.0 — better | 26.0 |
| Further details — not scored | ||
| Size | 27 MB | 98 MB |
| Age rating | 4+ | 4+ |
| Developer | Jaafar Abdeen | SAMANTH GURRAM |
In-app purchases
Strobe
No in-app purchases
Lumen Reader
No in-app purchases









