MathNotes vs Error

The all-in-one math solver and study app. MathNotes combines Desmos-like graphing, Symbolab-like step-by-step solving, 12 specialized calculators, an AI tutor, and beautiful handwritten notes, all in one place. Write naturally - Handwrite with Apple Pencil or your finger, no keyboard needed - Keep notes handwritten or compile to publication-ready documents Solve anything - Snap a photo of any problem for instant solutions, graphs, and step-by-step explanations - 12 built-in calculators: graphing, scientific, matrix, symbolic, unit converter, and more - AI-powered help that actually understands your work Stay organized - Unlimited notebooks and folders - Tag definitions, theorems, and formulas to build your own knowledge base - Import, annotate, and markup PDFs and textbooks - Export beautiful, perfectly formatted PDFs Built for students - Privacy-first: your notes are encrypted and never used for AI training - Works offline - One app replaces Desmos, Symbolab, Photomath, and your note-taking app Subscription - Plus unlocks unlimited notes, cloud sync, and other basic features. Premium unlocks the AI chat, agentic LaTeX editor, and cloud sync. Everything else: notes, all 12 calculators, PDF support: is free with limited use. Try Premium free for 7 days! Terms of Use: https://mathnotes.io/terms Privacy Policy: https://mathnotes.io/privacy

Mistakes are data. Most of us throw them away. error keeps them. Tap "I made a mistake" to start. What happened, why it happened, what you learned. Every entry gets an optional AI tip and failure-mode tags you can filter later. Browse your log by date or tag. Expand any entry for the full story. Swipe to delete what you don't need. Over time a pattern emerges: a weekly heatmap, a streak counter, entry counts by day. The next misstep gets a little less surprising. No accounts. No sharing. Your journal stays on your device. Simple on purpose. The hard part isn't the app.