Short answer: TestGlider is a paid AI mock-test platform for IELTS, TOEFL and PTE: full four-skill sittings with Writing and Speaking scored by AI in under a minute (its own figure, as of September 2026). It is free only for a trial test; membership prices vary by plan. Worth it for final-month test-day rehearsal.
Verdict up front: TestGlider is one of the best AI mock-test platforms for IELTS - full-length sittings graded across all four skills with band scores back in under a minute, by TestGlider's own figure.
It excels at test-day rehearsal; it is thinner as a daily diagnostic tool, which is the role most preparation weeks actually need.
Full disclosure: IELTSbiz is our own platform and is recommended as the alternative at the end. TestGlider is described strengths-first throughout, and its strengths are real.
What is TestGlider?
TestGlider is an AI-powered mock-test platform covering IELTS, TOEFL and PTE. Its pitch is simple and genuinely differentiated: sit a full-length simulated test - all four sections, real timing - and receive AI-graded band scores, including for Writing and Speaking - in "under 1 minute", as its IELTS page put it in September 2026.
The company says its scoring engine is trained on data from more than a million responses and reports 1,000,000 users, and the product wraps the scores in explanations, AI essay and speech corrections, model answers, an AI chatbot tutor (Glidy) and AI-recommended follow-up practice.
A paid membership unlocks the full set of AI-graded IELTS mock tests - TestGlider's IDP Korea package page lists 11 mock test sets, 780 practice questions and 34 lectures - with a free trial test available to sample the experience.
Who is TestGlider for?
Candidates in the final month. If your test date is booked and your question is "can I hold my band across a full two-hour-forty sitting?", TestGlider answers it more conveniently than almost anyone: real conditions, instant scores, no waiting days for a human marker.
It is a weaker fit for the earlier months of preparation, when what you need is not another full mock but hundreds of targeted questions on your weak formats with feedback deep enough to change your next attempt.
TestGlider features
Full-length AI-graded mock tests
The core product: complete IELTS simulations under exam timing, with all four sections scored by AI. Getting a Writing and Speaking band estimate minutes after a full sitting - rather than days later - changes how often you can afford to rehearse.
Explanations and model answers
After each test you can read explanations for questions you missed, and for Writing and Speaking, model answers alongside feedback on your own responses. It is genuinely useful review material, pitched at the response level rather than building a cross-test picture of your weaknesses by question type.
Correction credits
Deeper feedback is metered by correction credits - one credit per writing question or speaking part in mock tests, and per question in practice mode as of 2026. The credit system keeps costs honest but means your feedback volume has a budget.
AI recommendations
The platform recommends practice questions and lectures based on your mock-test results, a light adaptive layer that helps direct review time after each sitting.
TestGlider pricing (as of 2026)
| Tier | Price (as of 2026) | What you get |
|---|---|---|
| Free | $0 | Trial mock tests to sample the experience |
| Paid membership | Plan-dependent; check the site | Full set of AI-graded IELTS mock tests (11 sets on its IDP Korea package page), explanations, model answers, correction credits |
TestGlider sells plans of varying lengths and runs promotions, so check its pricing page for current numbers - the structure above is the stable part. Factor the correction-credit allowance into any comparison, since that is what governs how much Writing and Speaking feedback you actually receive.
TestGlider pros and cons
Pros
- Full-length IELTS simulations with genuinely fast AI band scores (under a minute, per TestGlider)
- Writing and Speaking scored, not just the objective sections
- Model answers and per-question explanations after every test
- Scoring engine trained on a large human-graded corpus
- Free trial tests before paying
Cons
- Feedback depth is metered by correction credits
- A fixed mock-test pool is finite for a long preparation
- No trap-level feedback or per-question-type band tracking across sessions
- Free tier is a trial rather than an ongoing allowance
Verdict: 7.5/10
TestGlider earns a 7.5/10 as a rehearsal instrument. For the specific job of simulating test day with instant scores across all four skills, it is excellent, and candidates in their final weeks get real value per sitting.
The missing points are the other five days of the week. Between mocks, improvement comes from high-volume targeted practice with feedback that names your exact mistake - and a mock-test platform, by design, delivers its feedback per sitting rather than building that granular, cumulative picture.
The best alternative: IELTSbiz
For the daily loop that fills the space between mock tests, IELTSbiz is the stronger pick. Full disclosure again: IELTSbiz is our own platform - start on the free tier and verify the claims directly.
IELTSbiz generates unlimited Cambridge-style reading passages by question type and returns trap-level feedback on every wrong answer - the specific distractor pattern that caught you, not just the correct option. Every session feeds a running per-question-type band estimate, so you always know which format to drill next.
The AI Writing Checker scores every essay against all four official criteria with no credit meter on the paid tier, and every correction quotes the sentence it is about, so you can check the feedback against your own essay (how we check our marking).
Free to start, then from $7.99/month or $50 lifetime (pricing).
TestGlider vs IELTSbiz at a glance
| TestGlider | IELTSbiz | |
|---|---|---|
| Price | Free trials; paid TG Pro membership (as of 2026) | Free to start; from $7.99/month or $50 lifetime |
| Writing feedback | AI-scored in mocks, metered by correction credits | AI checker, all four criteria, every essay |
| Reading practice | Within full mock tests, finite pool | Unlimited generated passages with trap-level feedback |
| Band tracking | Scores per mock test | Estimated band per question type over time |
| Free tier | Trial tests | Free daily practice and writing checks, no card |
The sensible schedule for the final month: IELTSbiz daily for targeted practice and essay checks, plus one full TestGlider-style mock each weekend to test stamina.
Our roundups of the best IELTS mock test websites and best AI tools for IELTS cover the field TestGlider competes in, and the best paid IELTS prep websites guide handles the budget question.