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Reading assistant with bionic text, readability scores, night modes, highlighting and drawing, guided pacing, and a PDF reader. Read Flow is a privacy-first reading assistant for web pages and PDFs. Open it from the toolbar or a page's right-click menu, then use bionic-style text emphasis at a light, balanced, or strong setting, a cursor-following reading ruler at the height you choose, and adjustable font, text size, line height, letter spacing, and column width. Calibrate a comfortable reading pace, see a local reading-speed estimate, or follow the guided word-by-word pacer. Contrast adaptation finds text that fails a WCAG ratio against its own backdrop and raises it until it passes. For reading after dark, Night reading either warms and dims the page or inverts it into a dark theme, on demand or only inside the hours you choose. Highlight passages in six colors and draw on any page with a pen, a translucent marker, and an eraser; highlights and drawings stay on your device and reappear when you return to the page. Bookmark your place in a long article or PDF: one shortcut marks the line you are reading, or right-click any line to mark that one. Jump back from the popup, or from All bookmarks, which lists every bookmarked page and reopens it at the spot. Bookmarks follow the text, so they still land on the right line after the page reflows or you change the text size. The readability score rates the page you are reading, a passage you select, or text you paste in: Flesch reading ease, an average US grade level, and the Flesch–Kincaid, Gunning fog, SMOG, Coleman–Liau, and Automated Readability Index grades behind it. For PDFs, Read Flow includes a text-reflow reader that extracts readable text into a clean article so the same accessibility and pacing tools work there too. Scanned PDFs without OCR may not contain extractable text. Saving citations has moved to ScholarSail's Cite Keeper extension; Read Flow's Sources section links to it, and sources saved by an earlier version can still be exported for import into Cite Keeper. Everything is processed in your browser. Read Flow has no accounts, analytics, ads, or tracking and sends nothing to ScholarSail or third parties. A remote PDF is fetched only when you explicitly open it in Read Flow. Keyboard shortcuts: - Enable or disable bionic reading: Ctrl+Shift+1 - Enable or disable the reading ruler: Ctrl+Shift+2 - Start or stop Guide Me pacing: Ctrl+Shift+3 - Cycle night reading (off, warm dim, dark): Ctrl+Shift+4 - Highlight the selected text: Alt+Shift+H - Bookmark the selected text, or the first line on screen: Alt+Shift+B - Open or close the drawing tools: Alt+Shift+D
Oct 24, 2026
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