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Side-by-side features, use cases and pricing — because the right pick depends on your job and budget, not just the ranking.
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Language REACTOR
✓ verifiedFreemium
Browser extension that adds dual subtitles and click-to-lookup to Netflix and YouTube for learning languages.
1.7M visits/mo
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Brilliant
✓ verifiedFreemium
Interactive learning app with an AI tutor for math, coding, science and data-visual, adaptive lessons for all ages.
2.6M visits/mo
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Algor Education
✓ verifiedFreemium
Algor Education turns notes, docs, and media into AI-generated concept maps, flashcards, quizzes, and study notes.
1.7M visits/mo
Pricing
No public pricing
No public pricing
No public pricing
Free: €0 (concept maps, up to 15k characters)
Beginner: €2.99/mo
Base: €5.49/mo
Pro: €7.99/mo
Free trial available
Core features
- ✦Dual subtitles on Netflix and YouTube
- ✦Click-to-lookup word translations
- ✦Saveable vocabulary items
- ✦Playback controls for language study
- ✦Works as a browser extension
- ✦Personal AI tutor (Koji)
- ✦Visual, interactive lessons
- ✦Adaptive practice based on mastery
- ✦Courses in math, CS, science and data
- ✦Gamified streaks, levels and daily goals
- ✦iOS and Android apps
- ✦Video lessons
- ✦Revision notes
- ✦Quizzes
- ✦Flashcards
- ✦Exam-style questions
- ✦Past papers
- ✦AI concept and mind maps
- ✦AI flashcards and quizzes
- ✦AI study notes/summaries
- ✦Transcriptions from audio/video
- ✦Prebuilt and custom templates
- ✦Multi-language support
Use cases
- →Learn a language while watching shows
- →Look up and save new words from video
- →Study with dual subtitles
- →Learning math and coding by doing
- →Getting adaptive tutoring outside class
- →Building STEM intuition
- →Daily skill practice
- →Preparing for Maths and Science exams at KS3, GCSE, and A-Level.
- →Turning notes into visual study aids
- →Creating teaching materials
- →Exam revision and self-study
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