Source-backed analysis9
Review basis
The AppDuo team prepared this review by analysing product features, official documentation and user feedback to help you understand its strengths, limitations and suitability for your needs.
9 reference sourcesInformation updated Nov 10, 2026
How we review
Prep Review
Test-prep platform for IELTS, TOEIC and HSK with AI-graded speaking and writing rooms
By AppDuo Editorial Team · Updated
- Web
- iOS
- Android
On this page
Decide at a glance
Our verdict
Prep suits learners preparing for IELTS, TOEIC or HSK who want a level-based path and AI grading of speaking and writing, and it holds 4.7/5 on both app stores. The trade-offs are sizeable one-off course fees, App Store prices that differ from the website, and refund terms that sit in the transaction terms rather than on the pricing page.
Best for: Learners preparing for IELTS or TOEIC who want a band-by-band path and a practice-test bank
Skip it if: Those who want monthly billing, a full free trial, or live sessions with native-speaking tutors
Pros
- Virtual speaking and writing rooms score against the 4 IELTS criteria; 8 AI-graded tasks per stage, up to 5 attempts each, with free teacher re-marking on appeal
- Highly rated: 4.7/5 on the App Store (6,588 ratings) and 4.7/5 on Google Play (4.75K reviews)
- IELTS courses are usable for life once activated, and free entry tests are offered
Cons
- One-off tuition: the full IELTS path is 12,000,000 VND (9,000,000 VND when all 4 courses are bought together)
- App Store prices differ from the website: IELTS Mất Gốc đến 6.0 (beginner to 6.0) is 7,500,000 VND on the App Store
All pros and cons · Who is it for?
Pros
- A 100% tuition refund guarantee for the Intermediate and Advanced IELTS stages (enrol 1 Aug to 31 Dec 2026)
Cons
- The guarantee has strict conditions (full path, required tests, exam at BC/IDP, one refund) and excludes the Foundation and Basic courses
- The privacy policy gives no retention period, although the app collects voice recordings
Best for
- People who want AI scoring of speaking and writing against exam criteria without fixed class times
Experience & key features
Prep (Prep Education) is an AI-based language learning and test-prep platform run by Prep Technology Joint Stock Company in Hanoi. Its homepage lists IELTS, TOEIC, HSK and PrepTalk English (AI role-play speaking practice), with separate pages for VSTEP and IELTS Junior. It runs on iOS, Android and the web, and the website is available in Vietnamese, English, Japanese, Korean, Thai and Indonesian.
Each IELTS course combines video lessons, a personalised study plan, AI-graded virtual writing and speaking rooms, the Teacher Bee AI assistant available 24/7 and a Practice Lab test bank. Per the IELTS page, the AI grades against the 4 exam criteria; each stage has 8 AI-graded tasks, each resubmittable up to 5 times, and learners who disagree with a score can ask a teacher to re-mark it for free. The TOEIC page describes a virtual speaking room simulating all 11 TOEIC Speaking question types on a 200-point scale.
Pricing and value
Prep sells one-off courses rather than monthly subscriptions. Per the IELTS page, the four stages cost 1,500,000, 2,500,000, 3,500,000 and 4,500,000 VND with lifetime access once activated; a 12-month AI practice pack costs 1,500,000 VND. Buying 2, 3 or 4 courses earns 15%, 20% or 25% off. Orders of 3,000,000 VND or more can be paid in 0% instalments on international credit cards from OnePay-linked banks. On the Vietnamese App Store, prices differ: a 90-day IELTS practice pack is 2,000,000 VND and IELTS Pro for 3 months is 599,000 VND.
Versus alternatives
Prep centres on exam-prep paths with AI grading for English and Chinese. For pronunciation alone, apps such as ELSA Speak are narrower; for an online practice-test bank alone, STUDY4 is a comparison point. AI grades are for reference only: Prep's AI usage policy says outputs may be inaccurate or incomplete and should be checked by the learner.
Screenshots
Plans & pricing
Prices last verified Nov 10, 2026
IELTS Nền tảng
Contact sales
1,500,000 VND one-off, usable for life from activation. From beginner to band 4.0. The output guarantee does not apply.
IELTS Cơ bản
Contact sales
2,500,000 VND one-off, usable for life. Band 4.0 to 5.0. The output guarantee does not apply.
IELTS Trung cấp
Contact sales
3,500,000 VND one-off, usable for life. Band 5.0 to 6.0, with an output guarantee for learners enrolling between 1 Aug and 31 Dec 2026.
IELTS Chuyên sâu
Contact sales
4,500,000 VND one-off, usable for life. Band 6.0 to 6.5+, with an output guarantee in the same enrolment window. Buying 2, 3 or 4 courses gets 15%, 20% or 25% off; the full path drops from 12,000,000 to 9,000,000 VND.
Gói luyện đề AI 1 năm
Contact sales
1,500,000 VND for 12 months of unlimited AI practice tests; excluded from the multi-course discount. Buying at least 2 courses with this pack adds 8 speaking and writing sessions with an IELTS 8.0+ teacher (valued at 5,000,000 VND; the offer may change).
- Free plan limits
- Free entry tests (IELTS, TOEIC, HSK, VSTEP, PrepTalk) help choose a course; no source describes a full free learning plan.
- Free trial
- No free trial
Cancellation & refunds
The payment page only points to Article 7 of the transaction terms for cancellation and refunds. For the IELTS output guarantee: after finishing the path, completing the required practice and sitting a real exam at BC/IDP without reaching the target, Prep refunds 100% of the tuition actually paid for the missed stage (plus the next stage in the purchased path, if any), once per learner.
Privacy
Per its personal information protection policy (updated 1 July 2026), Prep collects basic data (name, date of birth, phone, email and so on), sensitive data such as voice recordings and province-level location inferred from IP, plus device data and cookies. Data supports service delivery, personalised study paths and automated AI assessment, and may be shared with grading teachers, affiliates, partners, service providers and authorities where the law requires. Data is stored in Vietnam with backups possibly elsewhere, and no specific retention period is given. Users can request access, correction or deletion via [email protected], except where retention is legally required.
Prep alternatives
6.9/10Monkey
A family of English, story and math apps for children aged 0 to 11
6.9/10ELSA Speak
AI-scored English pronunciation and speaking practice
Frequently asked questions
How much does Prep cost?
Per the IELTS page, each stage costs 1,500,000 to 4,500,000 VND one-off with lifetime access; the full IELTS path is 12,000,000 VND, or 9,000,000 VND when all 4 courses are bought together. A 12-month AI practice pack is 1,500,000 VND.
Does Prep offer an output guarantee?
Yes, for IELTS Intermediate (target 6.0) and Advanced (target 6.5) for learners enrolling between 1 Aug and 31 Dec 2026. Conditions: finish the path, complete the required tests and sit a real exam at BC/IDP; if the target is missed, 100% of tuition actually paid is refunded, once per learner.
Can I pay in instalments?
Yes. Orders of 3,000,000 VND or more after discounts can be split into 0% instalments on international credit cards (Visa, Mastercard, JCB, American Express) from OnePay-linked banks: a 3-month term, or 3 or 6 months for orders of 6,000,000 VND or more. Prep charges no conversion fee; supplementary and business cards are excluded.
Does Prep have a mobile app?
Yes, on the App Store (4.7/5) and Google Play (4.7/5, 100K+ downloads), in addition to the web version.
Review evidence & sources9
Scores
- Ease of use
- 7.5
- Features
- 7.5
- Value for money
- 6.5
- Performance
- 7.0
- Support
- 6.5
- Privacy & security
- 6.0
Why this score
A personalised Study Plan, free entry tests and frequent app releases (latest 2.31.31); store ratings of 4.7/5.
Why this score
Covers IELTS, TOEIC, HSK, VSTEP and conversational English, with virtual speaking and writing rooms, the Teacher Bee AI assistant and a test bank. No independent source verifies the accuracy of the AI scoring.
Why this score
Single courses start at 1,500,000 VND with lifetime access, but the full IELTS path costs 9,000,000 to 12,000,000 VND, there is no monthly option, and App Store prices differ from the website.
Why this score
New releases almost weekly; the 2.31.31 notes mention steadier recordings. No independent verification of stability or band outcomes.
Why this score
A hotline and [email protected]; no live chat or response-time commitment found on the pages read.
Why this score
A policy updated July 2026, access and deletion rights, data stored in Vietnam; but it collects voice recordings, shares data with partners and gives no retention period.
What users say
- App Store (VN)4.7/5 · 6,588
- Google Play4.7/5 · 4,750
Sources
- Vendor-providedOfficial homepageNov 10, 2026
- Vendor-providedOfficial IELTS course pageNov 10, 2026
- Vendor-providedOfficial TOEIC course pageNov 10, 2026
- Vendor-providedOfficial payment policyNov 10, 2026
- Vendor-providedOfficial personal information protection policyNov 10, 2026
- Vendor-providedOfficial AI usage policyNov 10, 2026
- Vendor-providedOfficial Hall of Fame pageNov 10, 2026
- storeApp Store listing (VN)Nov 10, 2026
- storeGoogle Play listingNov 10, 2026
Specs & compatibility
- Developer
- Prep Technology JSC
- Headquarters
- Vietnam
- Launched
- 2021
- Category
- Education
Capabilities
- AI features
- Mobile app
Platforms
- Web
- iOS
- Android
Interface languages
- Vietnamese
- English
- Japanese
- Korean
- Thai
- Indonesian
Support
- Phone
- Help center
Change history
- Feature.App version 2.31.31 steadies recordings interrupted by calls and speeds up test loading in the Test Practice tab.
- Price.Enrolment window opens for the IELTS output guarantee (until 31 Dec 2026).
- Update.Personal information protection policy updated.
Full change history (5)
- Company.Hanoi Department of Education and Training issues training operation decision no. 1309/QĐ-SGDĐT.
- Launch.The Prep app is first released on the Vietnamese App Store.