DETPractice vs TST Prep
DETPractice
detpractice.comTST Prep
tstprep.comSide by side
| Figure | DETPractice | TST Prep |
|---|---|---|
| Price from | $9.90/mo | $3.08/mo |
| Free plan | Yes | — |
| Free trial | Yes | — |
| Open source | — | — |
| Web | Yes | Yes |
| iOS | Yes | — |
| Android | Yes | — |
| Plans published | 4 | 10 |
| Spec score · Language Test Prep Apps | 8.3 (#4) | 7.0 (#31) |
| AI feedback | The service provides AI-powered scoring and correction for DET speaking and writing responses. | The company says its learning approach includes AI-powered feedback and human-powered support. |
| Support | Online customer service is listed as available Monday–Friday from 10:00 to 19:00, with email responses within one business day. | The site says students can email TOEFL experts and expect a response within 24 hours. |
Plans
TST Prep
- Writing Evaluations$27, paid once
- Speaking Evaluation$29, paid once
- TOEFL Trial Lesson$29, paid once
- The Emergency Course$37 a year
- Complete Test Pack$89 a year
- The Score Builder Program$197 a year
- Reading Group Classes$247 a year
- Speaking Group Classes$247 a year
- Writing Group Classes$247 a year
- Private Lessons with a Teacher$397 a year
In their own words
DETPractice
DETPractice is a preparation platform for the Duolingo English Test, available on the web, iOS, and Android. It offers more than 18,000 practice questions, with content described as updated every day, plus courses, lessons, guides, and other learning materials. Adaptive full-length mock tests provide estimated scores in one to five minutes. AI tools score and correct speaking and writing responses, while an AI tutor can answer DET questions, check grammar, translate, rewrite text, and create practice content. The free tier includes all question types, more than 300 practice questions, basic explanations, and limited access to some features. Basic costs $9.90 a month, Plus costs $19.90 a month, and Pro costs $39.90 a month; paid tiers list varying mock-test and AI-correction allowances. Mock-test access expires after 90 days. The same account and supported learning history can be used in a browser and the mobile apps. DETPractice describes itself as a Platinum Partner for test preparation, while noting that its practice questions and mock tests do not replace the official Duolingo English Test.