Mark Bookmark vs Sidenote

Mark II is a smart bookmark that captures your physical notes and ideas, and turns it into organized insights for you to revisit later CAPTURE WITHOUT LEAVING THE PAGE Scan a passage and it's saved, at 99% text accuracy, with any missing letters or words reconstructed automatically. Or hold to record a voice note instead. No unlocking your phone, no typing, no losing the thread of the chapter. It works across your whole reading life — hardcovers, paperbacks, printouts, research papers, Kindle, iPad, and handwriting (beta). 30+ languages. A LIBRARY THAT BUILDS ITSELF Scan a book's ISBN once (beta) and everything you capture from then on files itself under the right title. No folders to design, no tags to maintain, nothing named twice. Over months, it becomes a catalogue of what you've actually read — not a system you have to keep feeding. FIND THE QUOTE YOU HALF-REMEMBER Search for a fragment and get the passage back with its source. Filter by topic, theme, or the moment you captured it. Copy it straight into whatever you're writing. TALK TO WHAT YOU'VE READ Chat with your own highlights and annotations. Trace an idea across different books. Ask about the thing you know you read but can't place. Mark AI answers from what you've captured and nothing else — it won't invent a passage, and it won't summarize a book you never opened. FITS THE SYSTEM YOU ALREADY HAVE Integrations with Readwise, Notion, and many more apps to come. Mark isn't asking you to move in. It's asking you to feed what you've already built. WORKS WHEREVER YOU READ Bluetooth only — pairs like AirPods. Captures save on the device when you're out of range and sync the moment you're back. A single USB-C charge lasts about a week of heavy reading. YOUR NOTES, HELD CAREFULLY Highlights and voice notes are encrypted and stored on AWS in North America. We don't hold personally identifiable information alongside your library, and you can request deletion of your data at any time. WHO IT'S FOR Students who annotate. Researchers who cite. Readers who underline in pencil and mean it. Anyone who has closed a book and been unable to say what was in it. WHAT'S FREE Downloading Mark is free, and so is everything core: highlighting, audio capture, auto-organization, and basic AI chat. An optional subscription unlocks the heavier AI features and advanced integrations. REQUIREMENTS The Mark II device is required for scanning and voice capture. Each device pairs to one account at a time. iOS only. Support: Support@mark.engineering Privacy Policy: thinkwithmark.com/policies/privacy-policy

Some thoughts don't need a folder, a title, or a five-step workflow. They just need to be written down before they disappear. Sidenote is a quiet capture app for the in-between moments - the reminder you think of on a walk, the sentence that arrives in the shower, the idea you don't want to lose before you reach your desk. Open the app, start typing, tap Done. Your thought drops into a simple stream, timestamped and waiting whenever you scroll back. No accounts. No sync. No noise. Everything stays on your iPhone. CAPTURE WITHOUT FRICTION Sidenote opens ready to write. A single prompt, a clean canvas, and nothing else competing for your attention. When you're done, your thought settles into your stream with a subtle, satisfying motion - then the screen is clear again for whatever comes next. Drafts are saved automatically, so if you're interrupted mid-thought, nothing is lost. YOUR THOUGHT STREAM Scroll down to revisit earlier sidenotes, grouped by day with timestamps. Search when you need to find something specific. Edit a note, share it, or remove it with a long press. Export your entire stream as plain text whenever you want a copy outside the app. Removed sidenotes stay on your device for 30 days, so you can restore them if you change your mind. GO LIVE Pin any sidenote to your Lock Screen and Dynamic Island with Go Live. Keep a reminder, a phrase, or an idea in sight for up to eight hours - without opening the app again. Choose a default or clear appearance to match how you want it to look on your Lock Screen. HOME SCREEN WIDGET Add a Sidenote widget to see your latest thought at a glance. Tap it to jump straight back into your stream. MAKE IT YOURS • Light, Dark, or System appearance • Font choices: System, New York, Georgia, or Mono • Adjustable text size across the app, widget, and Live Activity • Thoughtful haptics and animations (respects Reduce Motion) Sidenote is designed to feel calm, fast, and personal - like jotting something in the margin of your day. PRIVATE BY DESIGN Sidenote keeps your thoughts on this iPhone. There is no account to create, no server to sync to, and no data leaving your device. Your sidenotes belong to you. Built for people who think in fragments, capture in bursts, and want a place that stays out of the way until they need it. Start typing.