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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.

Language REACTOR logo
Language REACTOR
✓ verifiedFreemium

Browser extension that adds dual subtitles and click-to-lookup to Netflix and YouTube for learning languages.

1.7M visits/mo
PTE APEUni logo
PTE APEUni
✓ verifiedFreemium

AI-scored practice platform for PTE Academic and PTE Core exam prep, with question banks, predictions and study tools.

2.1M visits/mo
Semantic Scholar logo
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

Plant identification app with a 17,000+ species database plus care schedules, disease ID and botanist Q&A for home gardeners.

1.2M visits/mo
Pricing

No public pricing

No public pricing

No public pricing

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
  • AI scoring for speaking and writing
  • Full PTE question-type practice
  • Weekly exam prediction files
  • Vocabulary books and shadowing tools
  • AI study plan and score analysis
  • Web and mobile app sync
  • 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
  • Photo-based plant identification
  • Database of 17,000+ species
  • Disease and pest identification
  • Personalized watering and care schedules
  • Ask-the-Botanist expert answers
  • Customizable plant lists and reminders
Use cases
  • Learn a language while watching shows
  • Look up and save new words from video
  • Study with dual subtitles
  • Preparing for PTE Academic/Core exams
  • Practicing speaking and writing with AI feedback
  • Studying likely exam questions
  • Tracking prep progress
  • 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
  • Identify an unknown houseplant or flower
  • Diagnose plant diseases and pests
  • Set up a watering and care routine
  • Learn care specifics for a species
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