Instant, Cambridge-aligned feedback on your students' or your own writing — scores, error tags, corrections and printable reports, for B2, C1 and C2.
1
This app uses your own Anthropic key.
The marking is powered by Claude AI. You connect it with your personal key, so you're always in control and your writing goes straight to Anthropic — never through anyone else.
2
Get a key (one-time, a few minutes).
Create a free account at console.anthropic.com, add a little credit, then open API Keys and create one. It starts with sk-ant-. Marking one piece costs a fraction of a cent.
3
Paste it below and start.
Your key is saved only in this browser, on this device. You can clear it anytime.
Your key is stored locally in your browser and sent only to Anthropic's servers to produce feedback. It is never sent anywhere else. Usage is billed to your own Anthropic account. This tool gives AI-assisted feedback aligned with Cambridge English Qualifications criteria; it is not affiliated with or endorsed by Cambridge, and scores are a guide, not official results.
The Correction Desk
Writing feedback aligned with Cambridge English Qualifications criteria
by Prof. Candela Spina
Cambridge assessment scales
Anthropic API key
Get a key at console.anthropic.com
(pay-as-you-go; marking one essay costs a fraction of a cent). Your key is stored only in this browser on this
computer and is sent only to Anthropic's API — nowhere else.
Linking & connecting phrases
Marking history
Or snap/upload a photo of the task instead of typing it.
0 words
Check before you submit
Read these and tick what you've done. It's a quick self-check — you can still get feedback even if some aren't ticked.