GratisAI red-pen margin · confusion debugger · free tier

1 · Paste the problem

intake

Copy the question exactly — the wording carries the topic signals.

Your reasoning — partial, wrong, or two lines — is what the margin reads.

This tool computes in your browser tab. Nothing you type is uploaded, and nothing is stored on our servers — the work stays in this tab. Redact names and identifying details before you paste anything sensitive.
This is a working tool, not professional advice. Check the important outcome with a qualified human before you rely on it.

2 · The margin

ready

Confusion log — $4 one-time

Free tier: unlimited diagnoses and retry ladders, forever.

  • Saved confusion log — problems and fixes kept in this browser — estimate: ~15 min saved before an exam.
  • Study-sheet export — your log as a one-page review sheet — estimate: ~12 min saved.
  • Marked-up copy — print the problem with margin notes attached — estimate: ~8 min saved.

Your one-time purchase stays with you on this device — no account needed, and everything remains private in your browser.

GratisAI marks the one idea behind a stuck homework problem — free, in your browser.