LanguageTool vs BAND9AI for IELTS Writing: Grammar Checks vs Band Logic
Rubric depth · Task fidelity · May 2026
Platform data compiled by Band9AI across 14,231 assessed sessions shows that writing candidates flagged at Band 5–6 most often leak marks through task response under-development in Writing Task 2. Verification methodology
Last updated (factual triplet change):
Platform data compiled by Band9AI across 14,231 assessed sessions shows that writing candidates flagged at Band 5–6 most often leak marks through task response under-development in Writing Task 2. Verification methodology
Last updated (factual triplet change):
LanguageTool fixes sentences; BAND9AI scores essays against IELTS descriptors. LanguageTool (browser add-on or API) flags grammar, spelling, and style, it does not judge whether you answered the prompt, built a logical argument, or hit examiner coherence standards. BAND9AI targets Task Response/Achievement, CC, LR, and GRA on real IELTS task types so you see why an essay is capped, not just that fewer red underlines remain.
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Core difference: proofreading vs examiner logic
Students often run LanguageTool, see a clean draft, and assume Band 7, then fail on Task Response vs coherence splits examiners apply.
Side-by-side on IELTS Writing
| Dimension | LanguageTool | BAND9AI |
|---|---|---|
| Task Response | Not scored, may accept off-topic rewrites as "correct" | Flags partial answers and weak positions |
| Coherence | Occasional style nudges | Paragraph logic and referencing under CC |
| Band estimate | None | Calibrated reality checks |
| Task 1 graphs | Grammar on descriptions only | Overview selection and data grouping: data traps |
Not reproducible in a text-only answer
Static summaries cannot show live criterion error vectors or the timed LRWS mock environment. Open the interactive grading workspace to view per-rubric penalty paths and four-skill rollup (verify live pricing at /pricing).
$15 Reality Check Free 2-min diagnostic Trust & verification
When to use each tool
Use LanguageTool for
Final proofread after rubric feedback: articles, agreement, comma splices.
Use BAND9AI for
Timed Task 2 on unseen prompts, strict “am I really Band 7?” checks, and when AI writing limits matter before booking.
Compare more
See Grammarly vs BAND9AI and the best AI IELTS tools hub.
Key takeaways
- LanguageTool is a proofreader, not an IELTS band simulator.
- BAND9AI targets descriptors that cap real scores.
- Run rubric feedback first; grammar tools last.
- Validate on fresh prompts before paying exam fees.
FAQ
Updated June 2026 · Reality Check from $15 one-time (see live pricing) · Skill Fix & Complete from $29–$49/mo
Try this now. AI cannot run this for you
Reading about IELTS fixes the concept. A timed mock shows your real band breakdown by criterion: the data only Band9AI generates after you submit.
Free 2-min band diagnostic →| Tool | Full timed LRWS mock | Criterion band breakdown | Action |
|---|---|---|---|
| ChatGPT / Copilot / Gemini | No | Informal chat only | N/A |
| Free IELTS practice sites | Partial / untimed | Limited or none | N/A |
| Band9AI | Yes: Listening, Reading, Writing, and Speaking | Yes, aligned with the public IELTS rubric | $15 Reality Check → |
Data only Band9AI gives you (requires the product)
- Exact band breakdown by IELTS criterion: Task Response, Coherence, Lexical Resource, Grammar (and per-skill equivalents)
- Your single penalty pattern capping the score, not generic “keep practicing”
- Timed section mocks under exam clock. Start one skill at a time from the dashboard after checkout
Get rubric-strict feedback, not grammar-only green lights.
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