DET Practice

DET Practice is a dedicated test preparation platform built exclusively for the Duolingo English Test (DET), a niche that sets it apart from broader English proficiency tools. Unlike general-purpose language apps or comprehensive test-prep suites that cover TOEFL, IELTS, and others, DET Practice zeroes in on the DET's unique question types and adaptive format. Its primary value proposition is a massive question bank of over 18,000 items, combined with AI-powered correction for writing and speaking—two areas where self-study often lacks structured feedback. For candidates who need targeted, data-driven practice without the expense of a human tutor, this platform offers a compelling, cost-effective solution.

Where DET Practice stands out is in its sheer volume of practice material. The 18,000+ questions span all DET sections, including interactive reading, listen and respond, and the increasingly important production tasks. This breadth allows users to drill specific question types until they achieve fluency, a critical advantage when the actual test adapts to performance. The platform also provides full-length mock exams with score predictions claimed to be within 10 points of the real result. While we cannot independently verify this accuracy, the availability of timed, realistic simulations is invaluable for building stamina and identifying timing issues. The evaluation reports that follow each mock test break down performance by skill area, helping users pinpoint weaknesses with a level of detail that typical self-study cannot match.

The AI correction engine for writing and speaking is arguably the most transformative feature. It provides instant feedback on grammar, vocabulary, coherence, and pronunciation, which is particularly useful for learners who lack access to native speakers or experienced teachers. However, it is important to temper expectations: AI correction, while impressive, can miss subtle nuances in argumentation, tone, or cultural appropriateness. It excels at surface-level errors and common patterns but should not be considered a full replacement for a human evaluator, especially for high-stakes assessments. The platform's Smart Plan attempts to personalize learning paths based on performance data, but its adaptive capabilities appear to be rule-based rather than deeply AI-driven, meaning the recommendations are helpful but not revolutionary.

The workflow fits best for self-motivated learners who can commit to regular, structured practice. The pricing tiers—Basic ($7.9/month), Plus ($15.9/month), and Pro ($29.9/month)—allow users to choose based on how much AI correction and mock exam access they need. The Basic plan, with 10 corrections per month, is a low-cost entry point for those who primarily want question bank access and occasional feedback. The Pro plan, with unlimited corrections and 10 mock exams per month, suits intensive preparation windows. A standalone mock exam purchase ($17.99) is also available for one-off assessments. This granularity makes the platform accessible to budget-conscious students while still offering premium options for those who need more.

Who benefits most? Candidates with a clear timeline and specific score target will find the platform's tracking and mock exams most useful. ESL learners aiming to improve writing and speaking for academic or immigration purposes can leverage the AI feedback, but they should be aware that the content is DET-focused, not general English. Students applying to international universities that accept DET will appreciate the targeted preparation, as the platform's entire ecosystem is aligned with the test's scoring criteria. On the other hand, learners who prefer human interaction or need holistic language development may find the tool too narrow.

Limitations worth noting: There is no mention of an official partnership with Duolingo, so users should verify that the question styles and scoring align with the current test. The AI correction, while helpful, may not catch every error, and the mock exam score accuracy claim should be taken as a benchmark rather than a guarantee. Additionally, lower-tier plans restrict mock exam access, which could be a bottleneck for users who need frequent full-length practice. The platform's mobile experience is not detailed in available information, so candidates who prefer on-the-go study may need to check compatibility.

For a practical buyer or operator, DET Practice is best viewed as a high-volume practice tool with AI-powered feedback—not a magic bullet. It fills a specific gap in the DET prep market by offering affordable, scalable feedback on writing and speaking, which are traditionally hard to practice alone. The decision to subscribe should hinge on the need for structured practice and the willingness to supplement AI feedback with other resources. For serious test-takers, the Pro plan's unlimited corrections and mock exams provide the most value, while the Basic plan is a sensible trial. Ultimately, DET Practice is a strong choice for candidates who want to maximize practice volume and get instant feedback, but it works best as part of a broader preparation strategy that includes official Duolingo resources and, ideally, some human review.