Xournal++
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Listed because a sourced use case names it. Pricing not verified by KitRank: see the official pricing page.
Use cases with Xournal++
Research & learningHacker News · abdullahalharir
Get your handwritten math marked up like a teacher would
A calculus student built penmentor: press a key while working by hand in Xournal++ and Claude, Codex or Gemini marks up the page with hints instead of answers. It runs on the AI command-line agent you already use, on that subscription.
$17/mo1 weekIntermediate