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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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SPEAKPAL
✓ verifiedFreemium
AI language tutor offering role-play conversations, pronunciation coaching and instant grammar correction across 30+ languages.
193K visits/mo16K saves
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Elsa Speak
✓ verifiedFreemium
AI English pronunciation and speaking coach giving real-time feedback via speech recognition, used by millions.
1.2M visits/mo6.7K saves
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Semantic Scholar
✓ verifiedFree
Free AI-powered academic search engine indexing 236M+ papers, for researchers wanting semantic literature discovery and an augmented reader.
7.9M visits/mo13K saves
Pricing
No public pricing
No public pricing
1 month: $35.5
3 months: $58
1 year: $85.19 (from $141.99)
Lifetime: $119.99 (from $799.99)
No public pricing
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
- ✦Real-life role-play conversation practice
- ✦AI pronunciation coaching for accent and rhythm
- ✦Real-time grammar correction during chats
- ✦Adaptive tutoring based on skill level
- ✦Downloadable course and audio materials
- ✦AI-generated, QR-verifiable proficiency certificates
- ✦Real-time pronunciation feedback
- ✦Speech-recognition assessment
- ✦Personalized learning path
- ✦Thousands of gamified lessons across topics
- ✦Progress tracking
- ✦ELSA Dictionary
- ✦AI-powered semantic search across 236M+ papers
- ✦Semantic Reader for augmented, contextual paper reading
- ✦Free public API for paper search and metadata
- ✦Author and topic discovery
- ✦Citation graph exploration
- ✦Beta program for new features
Use cases
- →Learn a language while watching shows
- →Look up and save new words from video
- →Study with dual subtitles
- →Practicing job interview or travel conversations in a new language
- →Getting pronunciation feedback without a live tutor
- →Preparing for language proficiency verification
- →Supervised language practice for teen learners
- →Improving English pronunciation
- →Building speaking confidence
- →Preparing for work or travel in English
- →Daily 10-minute practice
- →Researchers searching scientific literature across disciplines
- →Developers building applications on top of scholarly data via the API
- →Students exploring citation networks for a topic
- →Librarians and academics needing free literature discovery tools
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