AI4IELTS vs Band9AI: IELTS Writing & Speaking Checker Compared

Fair fork for AI4IELTS credit-plan shoppers · September 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): 2026-06-30

Direct answer

AI4IELTS vs Band9AI is a fair fork, not a smear. AI4IELTS usually wins if you want cheap, credit-based Writing and Speaking grading you can run often on a tight budget. Band9AI usually wins when you need a native timed four-skill mock (Listening, Reading, Writing, Speaking together) without needing to reach AI4IELTS's top Combo tier for full-test coverage. If you searched "AI4IELTS," use AI4IELTS for frequent low-cost credit grading; switch to Band9AI when the question becomes "will this hold up in one real timed sitting?"

Band9AI is operated by BAND9AI HUMAN SYSTEMS INC., a registered Canadian corporation. Trust & verification

Founded by Mustafa Darras, AI Systems Architect. meet the founder.

Who this comparison is for

This page is for candidates who already found AI4IELTS and want an honest side-by-side with Band9AI—not a generic "best AI tools" list. Both products aim at IELTS AI feedback. They optimize different jobs.

AI4IELTS (ai4ielts.com) is a credit-based platform built around IELTS Writing and Speaking grading, trained on the publicly available IELTS Band Descriptors across Task Achievement, Coherence & Cohesion, Lexical Resource, and Grammatical Range & Accuracy. Band9AI is built around timed Listening, Reading, Writing, and Speaking mocks with criterion-level diagnostics, native to every plan. Neither replaces an official examiner mark. Treat every AI band as a practice estimate.

AI4IELTS vs Band9AI comparison table

Pricing and plan names change. Figures below reflect AI4IELTS's public pricing page and Band9AI's live checkout as of September 2026—always verify the linked pages before you buy.

Dimension	AI4IELTS	Band9AI
Best for	Wins: cheap, credit-based Writing/Speaking grading for frequent use	Wins: native timed 4-skill mock on every plan
Writing coverage	Unlimited grading on Writing Plus (from $4.27/mo) or Combo	Task 1 & 2 scored inside the timed Writing section of a mock
Speaking coverage	Unlimited grading on Speaking plan (from $3.80/mo) or Combo	Speaking scored inside a timed mock interview flow
Full 4-skill test	"Real Test, all 4 skills" is part of the Combo plan (from $7.12/mo); confirm current format live	Native timed Listening, Reading, Writing, Speaking on every diagnostic, no upgrade tier needed
Free tier	20 credits shared across Writing/Speaking/Reading-Listening per AI4IELTS's pricing page	No free full mock; entry is the $15 Reality Check diagnostic
Feedback shape	Band-descriptor-based scoring across 4 criteria (as marketed)	Criterion breakdowns aimed at the penalty capping your band; see methodology
Pricing (verify live)	AI4IELTS pricing: free tier with 20 credits; Writing Plus from $4.27/mo; Speaking from $3.80/mo; Combo from $7.12/mo; 100% refund within 3 days	Band9AI pricing: $15 Reality Check diagnostic entry; skill bundles and subscriptions on the same page

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 AI4IELTS is better

Choose AI4IELTS when You want frequent, low-cost Writing and Speaking grading on a tight monthly budget, and full timed exam simulation isn't your immediate priority.

Typical signal You're drilling essay structure or Speaking Part 1-3 answers often and want a cheap per-month credit plan rather than paying per diagnostic.

AI4IELTS is the rational pick for credit-based volume. A free tier plus low monthly plans for unlimited Writing or Speaking grading make frequent practice affordable, and the refund policy lowers the risk of trying it.

When Band9AI is better

Choose Band9AI when You need one honest timed run across all four skills without hunting for the right plan tier, and want the pressure of a real clock to surface what untimed grading hides.

Typical signal You are weeks from the exam and need a single Reality Check that mirrors exam-day pacing across Listening, Reading, Writing, and Speaking together.

Band9AI is the rational pick for exam-condition truth on every plan, not only the top tier. Examiners don't mark isolated Writing or Speaking submissions—they mark a candidate under the full test-day sequence. Band9AI's product job is to put all four skills inside that pressure from the entry $15 Reality Check onward.

Pricing: verify both live pages

AI4IELTS (as listed on ai4ielts.com/en/pricing): free tier with 20 shared credits across Writing, Speaking, and Reading/Listening tips; Writing Plus from about $4.27/month (unlimited Writing grading); Speaking from about $3.80/month (unlimited Speaking grading); Combo (recommended) from about $7.12/month, adding "Real Test, all 4 skills" access. No auto-renewal; 100% refund within 3 days if unsatisfied.

Band9AI (see band9ai.com/pricing and checkout): entry diagnostic is a $15 Reality Check (one timed mock path with criterion feedback, all four skills). Skill mastery bundles and longer plans are listed on the same pricing page.

Honest cost takeaway: for cheap recurring Writing/Speaking grading, AI4IELTS wins on price. For a single timed four-skill truth before you book the real exam, Band9AI's Reality Check is usually the cheaper mistake to avoid than another official exam fee.

The "use both" path

Weekday volume: Run Writing and Speaking drafts through AI4IELTS credits. Fix repeating criterion issues between sessions.
Weekly or pre-exam Reality Check: Run Band9AI's timed four-skill mock to see whether AI4IELTS gains transfer under pressure and alongside Listening/Reading fatigue.
Close the loop: Take Band9AI's capping penalty back to AI4IELTS drills for the next practice week.

Using both is not indecision. It is matching tool to job: credit-based grading volume vs full exam simulation. Compare also LexiBot vs Band9AI and Cathoven alternative for IELTS writing AI if your stack includes other writing checkers.

What neither tool is

Neither AI4IELTS nor Band9AI is the official IELTS score. Neither should be treated as a guarantee of test-day bands. We deliberately do not invent AI4IELTS accuracy percentages, correlation claims, or examiner-match rates beyond what AI4IELTS publishes on its own site. Band9AI's own validation-style disclosure lives on trust and methodology pages and remains a practice signal.

Key takeaways

AI4IELTS wins cheap, credit-based Writing/Speaking grading—admit that clearly if monthly budget and frequency are the goal.
Band9AI wins when you need a native timed four-skill mock without upgrading to a top plan tier.
AI4IELTS's Combo plan does advertise a "Real Test, all 4 skills" option—verify its current timing format before assuming it matches exam-day pacing.
Verify AI4IELTS and Band9AI pricing on their live pages before you buy.
Many serious candidates should use both: AI4IELTS for volume, Band9AI for Reality Checks.

FAQ

AI4IELTS is usually better for cheap, credit-based Writing and Speaking grading you can use frequently on a budget. Band9AI is usually better when Writing needs to be scored inside a real timed exam block alongside Listening, Reading, and Speaking.

AI4IELTS's Combo plan advertises "Real Test, all 4 skills" access alongside unlimited Writing and Speaking grading. Confirm current packaging and timing format on AI4IELTS's live pricing page.

As listed on AI4IELTS's pricing page: a free tier with 20 shared credits, Writing Plus from about $4.27/month, Speaking from about $3.80/month, and a Combo plan from about $7.12/month. Verify current prices live before buying.

Yes. Use AI4IELTS for frequent, low-cost Writing and Speaking credit-based practice; use Band9AI for a timed Reality Check and full-mock diagnostics before you book the real exam.

Already using AI4IELTS credits?

Keep AI4IELTS for cheap, frequent grading. Run one timed Reality Check to see whether those gains survive a full exam-day sequence across all four skills.

Get a $15 Reality Check → Timed Writing practice

Fair fork: AI4IELTS for cheap credit-based grading. Band9AI when timed, all-four-skill truth matters.

Reality Check → Timed Writing →