Grade the whole class in one pass
Set up four things, then press Grade once. Your rubric and the essays are read here in your browser, so what comes back is a fast first take on the grading that you edit before it ever reaches a student.
Free, no sign-up, and nothing you grade is kept on our servers. Your rubric and your students’ writing pass through OpenGrader on their way to the AI provider you pick, carrying your own key, because a browser cannot call those APIs directly. They exist in memory for the length of one request and are then dropped: no account, no database, nothing written to disk, and nothing about the text or your key written to a log. Your work stays in this tab so a reload doesn’t lose it. What happens to an essay, in full.
Your rubric
neededWhat kind of writing is this?
neededThis adds genre-specific checks to the feedback. It never changes your rubric score.
Your API key
neededAn API key is a password-like code that lets OpenGrader send your rubric and essays to an AI model, and bills that usage to you, not us. You paste it once and it is kept in this browser, then sent with each grading request.
Get a Google Gemini key in about two minutes
This is the one path that is genuinely free. Every Google account gets a no-cost tier that handles a class set fine.
- Open aistudio.google.com/apikey and sign in with any Google account.
- Click Create API key, then Create API key in new project.
- Copy the key. It starts with
AIza. - Come back here, click I already have one, and paste it.
Prefer Claude or GPT? Both work, but both need a payment method on file first. Get a Claude key at console.anthropic.com/settings/keys, or a GPT key at platform.openai.com/api-keys.
The class set
neededOne file per student. .txt, .docx, or .pdf. Files are opened here in your browser; the text goes to the provider with your key when you press Grade.