DET Bridge
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Duolingo English Test GPN Gold Partner

AI-scored practice
built only for the Duolingo English Test

About 4,000 practice questions in the exact formats the test uses, with instant AI scoring for writing and speaking. Find what is holding your score back, and fix it before test day.

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The DET Bridge app on a laptop and a tablet
Duolingo characters

What is DET Bridge

An all-in-one study platform for the Duolingo English Test

From question-type drills to buying your official test at a partner discount, everything for the Duolingo English Test in one place.

  • Every question type, covered

    All of the formats the Duolingo English Test uses, with unlimited retries and full-length mock tests under real time limits.

  • Built by certified trainers

    Questions and explanations are written and reviewed by trainers certified by Duolingo, so you practice what the test actually rewards.

  • Instant AI feedback

    Writing and speaking answers are scored the moment you submit them, with specific fixes for the score band you are aiming at.

Score results

Scores that moved with DET Bridge

Real users, before and after

  • 4 months of study

    95to125+30

    Reading and listening improved the most. I started seeing the patterns behind the questions.

    Graduate school application / S., 20s

  • 8 weeks of study

    105to130+25

    I did not expect this much in a short sprint. The AI explanations were precise.

    Working abroad / T., 30s

  • 3 months of study

    85to120+35

    My first time taking the DET, and I could still work through it step by step.

    Study abroad / M., late teens

Core features

The features that move your score

Content kept in line with the 2025 and 2026 test formats

  • AI writing feedback screen

    AI writing feedbackMost used

    Grammar, range of vocabulary and how convincing your answer reads, analyzed in seconds — with the specific edits that move your score.

  • AI speaking scoring screen

    AI speaking scoringMost used

    Pronunciation, fluency and vocabulary scored automatically, so the section that is hardest to practice alone stops being a guess.

  • Practice and mock test screen

    Drills and full mock tests

    Practice one question type at a time, then sit a full test under the real time limit. Everything you need in one app.

  • Mock test start screen

    30 full-length mock tests

    Thirty mock tests under the same time limits as the real exam. Sit the full test again and again, and go into test day prepared.

Gold Partner discount

Book the official test
through DET Bridge

¥12,320 list price¥9,400/ test

Price for DET Bridge paid members. Free and non-members pay ¥11,000. All prices include tax.

As an official Gold Partner of the Duolingo English Test, we sell the official test at a partner price. Study in the app, then book the real test without leaving DET Bridge.

  • Over 20% off the list price
  • Results within 24 hours
Take the test for ¥9,400 →Continue to sign-up

Pricing

Simple pricing

Pick the plan that matches your test date

  • Try it first

    Free

    ¥0

    • A sample of the practice questions
    • Answers and explanations
    • AI writing feedback: 1 per day
    • AI pronunciation scoring: 1 per day
    Start free

    No credit card required

  • Studying month to month

    Monthly

    ¥2,480/month

    (tax included)

    • Every practice question
    • Answers and explanations for every question
    • Mock tests: 10 per month
    • AI writing feedback: 10 per day
    • AI pronunciation scoring: 10 per day
    Start the monthly plan

    Renews monthly, cancel any time

  • Six months, paid once

    6-month pass

    ¥8,680/6 months

    (tax included · about ¥1,446 per month)

    • Every practice question
    • Answers and explanations for every question
    • Mock tests: 10 per month
    • AI writing feedback: 10 per day
    • AI pronunciation scoring: 10 per day
    Buy the 6-month pass

    Valid for 6 months, no auto-renewal

Prices and plan contents may change.

FAQ

Frequently asked questions

How much practice material is there?
About 4,000 questions across all of the question types used by the Duolingo English Test, plus full-length mock tests. Interactive Reading and Interactive Listening are counted as sets rather than single questions.
Is DET Bridge available outside Japan?
Yes. The app runs in any browser, and the Duolingo English Test itself is taken online, so you can study and sit the test from anywhere. Billing is in Japanese yen.
Are the explanations in English?
The questions follow the real test, which is entirely in English. Written explanations are currently in Japanese, while AI feedback on your writing and speaking is given in English.
What can I pay with?
Credit card through Stripe. PayPay and bank transfer are also available inside Japan. Details are shown on the product page.
Can I use DET Bridge on more than one device?
Yes. One account works on a computer, a tablet and a phone. Using several devices at the same time is not supported, so log out on the previous device before you sign in on another one.
How do I cancel?
Sign in, switch to the free plan on the plan settings screen, and close your account after the paid period ends. The 6-month pass does not renew automatically. We do not refund the remaining period when you cancel partway through.
Anything else?
Send us a messageand we will get back to you.

Start with the free plan today

No credit card, no commitment. See where your score stands first.

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