The tutor places your level, teaches one rule, drills you on it — error-correction, then sentences you write yourself — then runs an autopsy on the pattern behind what you got wrong before marking the concept mastered. Get an answer wrong and it hints; it never hands you the fix outright.
Grammar tutor · Essay examiner · Self-hosted
Every great score starts
in the margins.
A GRE and IELTS writing coach you run yourself, on your own OpenAI or Anthropic key. It teaches one grammar concept at a time, drills you until it holds, grades full essays against the exam boards' own published standards, and line-edits whatever you paste in — all on the same account, all kept in one place.
Five ways to work
One account, one track at a time — GRE or IELTS, switchable from the header. Everything below writes to the same history.
GRE: the 30-minute Analyze an Issue task, scored 0–6 in half points against whichever of ETS's six official instruction sets the prompt carries. IELTS: Task 1 or Task 2, banded 0–9 on the four official criteria. Every error is marked up in red, and the weakest paragraph is rewritten so you can see the gap directly.
Paste one sentence or several paragraphs. It asks where the writing is headed first — exam essay, academic paper, work email, casual message — because the same sentence is a fault in one register and fine in another. Every mistake is named, explained, and marked up as a word-level correction, with a couple of cleaner rewrites underneath.
Error-correction pulled across every concept you've studied, in unpredictable order, each with a full explanation — the concept being tested isn't named until after you've answered.
Tag every word in a real exam-style sentence with its part of speech, then see a reason for each one — not just which words you missed.
Graded against the published standard
Not a house rubric. The examiner reads the same language the exam boards publish, so a score means what the board says it means.
ETS · GRE Analytical Writing scoring guide
- Level 4
Generally demonstrate control of the conventions of standard written English, but may have some errors.
- Level 5
Conveys ideas clearly and well, using appropriate vocabulary and sentence variety.
- Level 6
Conveys ideas fluently and precisely
, withsuperior facility with the conventions of standard written English.
Held against all six official Issue instruction sets, not graded in the abstract.
IELTS · public Writing Band Descriptors
- Band 6
A mix of simple and complex sentence forms
, with errors thatrarely reduce communication.
- Band 7
A variety of complex structures
andfrequent error-free sentences
, withgood control of grammar and punctuation.
- Band 8
A wide range of structures
wherethe majority of sentences are error-free
, withonly very occasional errors or inappropriacies.
Task 1 and Task 2 are graded on different first criteria — Task Achievement and Task Response — because the descriptors treat them differently, too.
Self-hosted, spend-capped
Margin proxies your own OpenAI or Anthropic key — it never holds a key of its own. Every call is billed to that key, and credits are the only spend control: a shared install can't quietly run up the bill. A failed or empty response is refunded, never charged.
| Action | Cost on this install |
|---|---|
| Lesson turn | 1 credit(s) |
| Mixed practice turn | 1 credit(s) |
| Parts of speech turn | 1 credit(s) |
| Proofread pass | 2 credit(s) |
| Essay grade | 5 credit(s) |
| New account starts with | 10 credit(s) |
These are this install's current configured costs, set by whoever runs it — they can differ install to install.