NotebookLM
Source-grounded AI research assistant from Google, notable for its generated audio summaries.
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// 12 free tools
4 are completely free and 8 have a free plan with paid upgrades. Sorted by popularity.
β All Learning & Lifestyle tools, free and paidSource-grounded AI research assistant from Google, notable for its generated audio summaries.
Free AI travel planner that combines chat-based itineraries, maps, collaboration and booking.
Free AI symptom assessment app that structures health concerns ahead of professional consultation.
Conversational AI trip planner generating complete itineraries with integrated flight and hotel options.
AI answer engine that combines real-time web search with cited, conversational responses.
Consumer platform for chatting with and building AI personas, driven by community-created characters.
Premium Duolingo subscription adding generative AI roleplay, speaking practice and answer explanations.
Flashcard-centric study platform expanded with AI-generated guides, quizzes and adaptive review.
AI research assistant specialized in paper discovery, summarization and structured data extraction.
Academic search engine that synthesizes peer-reviewed findings into concise, evidence-based answers.
AI-powered interactive fiction platform for open-ended, player-directed text adventures.
Clinician-informed AI wellness app offering CBT-based self-help alongside professional care.
By popularity, Perplexity leads, followed by NotebookLM and Character.AI.
12 of 12 (100%) are free or freemium. Highest ranked: Perplexity, NotebookLM and Character.AI.
Median entry price: $11.99/mo. Range: $7.99β$29.99/mo across 7 paid plans.
7 of 12: Character.AI, Quizlet, Elicit and Mindtrip.