| Duolingo | Language learning | Building a daily habit in a new language. | AI conversations are short and scripted, and reviewers find them repetitive | Yes | Free tier: yes. Super about $12.99/mo. Max about $29.99/mo or $168/yr (US, third-party report). (checked Oct 11, 2026) |
| Memrise | Language learning | Learners who want real-world video and vocab. | AI conversation practice is shallow and buggy, and limited to English learners | Yes | Free tier: yes. Pro $61.99/yr, $24.99/mo or $329.99 lifetime. (checked Oct 11, 2026) |
| Brilliant | Study and courses | Self-learners who like interactive problem solving. | Free tier is just limited daily lessons | Yes | Free tier: yes (limited). Premium about $20/mo annual ($240/yr), $30 monthly. (checked Oct 11, 2026) |
| Quizlet | Study and courses | Students drilling vocab and facts. | Learn and Test modes are paywalled, and Plus still caps them | Yes | Free tier: yes. Plus $7.99/mo or $35.99/yr. Plus Unlimited $9.99/mo or $44.99/yr. (checked Oct 11, 2026) |
| Coursera | Study and courses | Career learners stacking certificates. | Plus is $59/mo or $399/yr and excludes degrees and some certificates | Yes | Free audit for many courses. Plus $59/mo or $399/yr (US). (checked Oct 11, 2026) |
| Science Olympiad Tests (SciolyPrep) | Practice tests | Division B and C students and coaches who want quick extra practice tests. | Questions are AI-written and we found no mention of expert review, so check answers against your event rules and resources | Yes | Free: 5 AI-generated tests/month, PDF import. Pro $4.99/month (unlimited). Season Pass $19.99 one-time (Sept 1-May 31). (checked Oct 21, 2026) |