| Ai2 Paper Finder (Asta) | Free | Academic Research | Agentic literature-search tool built by Ai2, now folded into the broader 'Asta' research-agent platform |
| AlphaFold Server | Free | Science & Research AI | Free browser-based access to AlphaFold 3-class structure prediction for non-commercial research |
| alphaXiv | Free | Academic Research | Free overlay for arXiv papers with public discussion/comment threads per paper |
| Amazon Rufus | Free | AI Shopping Assistants | Embedded directly in Amazon app/site for 300M+ customers, no separate signup |
| Boltz | Free | Science & Research AI | First fully open-source model to approach AlphaFold3-level structure prediction, MIT-licensed |
| Daydream | Free | AI Shopping Assistants | Proprietary fashion-trained AI understands cut/color/occasion, not generic product search |
| Docling | Free | AI OCR & Document Extraction | MIT-licensed, 64.7k GitHub stars, IBM Research-originated, now under LF AI & Data Foundation |
| Google LearnLM | Free | AI Tutors & Learning | Learning-tuned tutoring in Gemini |
| GuideGeek | Free | Travel Planning | 1M+ consumer users per vendor, live since April 2023 (longer track record than most AI trip tools) |
| Marker | Free | AI OCR & Document Extraction | Apache-2.0 code, 38.7k GitHub stars, converts PDFs/DOCX/PPTX/XLSX to markdown/JSON |
| Morphic | Free | AI Search & Answer Engines | Open-source, Apache 2.0, self-hostable generative-UI search engine |
| olmOCR | Free | AI OCR & Document Extraction | Apache 2.0 open-source OCR toolkit from Ai2, 19.3k GitHub stars |
| Perplexica | Free | AI Search & Answer Engines | MIT-licensed, fully self-hostable open-source Perplexity clone |
| Phia | Free | AI Shopping Assistants | Chrome extension + iOS app that surfaces resale/secondhand alternatives while shopping |
| ResearchRabbit | Free | Academic Research | Visual citation-network mapping across 310M+ papers |
| Scira | Free | AI Search & Answer Engines | Free, no credit card required |
| Semantic Scholar | Free | Academic Research | Fully free AI-powered search across 237M+ scientific papers |
| STORM (Stanford) | Free | Deep Research & Documents | MIT-licensed open-source system that researches a topic and writes a full cited report |
| AskYourPDF | Freemium | AI OCR & Document Extraction | Chat with any PDF plus auto-fill PDF forms |
| Brisk Teaching | Freemium | AI for Teachers & Classrooms | Works inside Google Docs/Slides/Classroom and Microsoft Word/PowerPoint via extension |
| Chai-1 (Chai Discovery) | Freemium | Science & Research AI | Chai-1 is free, Apache-2.0-licensed for academic and commercial use — a genuinely open structure-prediction model |
| ChatGPT Deep Research | Freemium | Deep Research & Documents | Runs up to ~30 min for exhaustive reports |
| ChatGPT Search | Freemium | AI Search & Answer Engines | Real-time web answers inside ChatGPT |
| ChatGPT Study Mode | Freemium | AI Tutors & Learning | Socratic step-by-step tutoring mode built into ChatGPT rather than direct answers |
| ChatPDF | Freemium | Deep Research & Documents | Chat with any PDF or document |
| Connected Papers | Freemium | Academic Research | Visual graph of related papers built from co-citation analysis |
| Consensus | Freemium | Academic Research | Answers grounded in peer-reviewed papers |
| Curipod | Freemium | AI for Teachers & Classrooms | Generates teacher-led interactive lessons aligned to 55+ curricula |
| Duolingo Max | Freemium | AI Tutors & Learning | AI roleplay and 'Explain My Answer' |
| Elicit | Freemium | Academic Research | Find and summarize research papers |
| ELSA Speak | Freemium | Language Learning AI | Free plan includes AI role-play conversations and real-time pronunciation feedback |
| Emergent Mind | Freemium | Academic Research | Surfaces trending arXiv papers with video/whiteboard-style explainers |
| Exa | Freemium | AI Search & Answer Engines | Search API built specifically for AI agents/LLMs, not humans |
| Felo | Freemium | AI Search & Answer Engines | Free multilingual AI search & creation platform |
| Gemini Deep Research | Freemium | Deep Research & Documents | Multi-step research across the web |
| Glasp | Freemium | YouTube & Content Summarizers | 2M+ users per vendor; free web/PDF/Kindle highlighter with a social discovery layer of other users' highlights |
| Grok DeeperSearch | Freemium | AI Search & Answer Engines | Live search across X and the open web |
| Humata | Freemium | AI OCR & Document Extraction | Free tier: 60 pages, 10 answers, no card |
| iAsk.ai | Freemium | AI Search & Answer Engines | Free AI answer engine aimed at students/researchers |
| Khanmigo | Freemium | AI Tutors & Learning | Socratic AI tutor from Khan Academy |
| Knowt | Freemium | AI Tutors & Learning | Positions as the free Quizlet alternative, with unlimited learn mode/practice tests free |
| Komo | Freemium | AI Search & Answer Engines | Fast, ad-free AI search |
| Kosmos (Edison Scientific / FutureHouse) | Freemium | Science & Research AI | Autonomous AI agent that runs literature review + data analysis cycles, condensing ~6 months of research into a day per vendor |
| Litmaps | Freemium | Academic Research | Network-map visualization of citations across a research topic |
| LlamaParse | Freemium | AI OCR & Document Extraction | Parses 90+ formats incl. complex tables/charts/handwriting into clean markdown |
| MagicSchool AI | Freemium | AI for Teachers & Classrooms | 80+ free AI tools for teachers: lesson planners, rubric generators, writing feedback |
| Mathpix | Freemium | AI OCR & Document Extraction | Specializes in STEM: equations, chemistry structures, handwriting to LaTeX/text |
| Mindtrip | Freemium | Travel Planning | Conversational itinerary building with live maps/booking links in one thread |
| Mistral OCR 4 | Freemium | AI OCR & Document Extraction | Self-hostable single-container OCR model for regulated industries |
| NotebookLM | Freemium | Deep Research & Documents | Grounded answers from your own sources |
| NoteGPT | Freemium | YouTube & Content Summarizers | 400,000 active Chrome Web Store users as of Jul 2026, ~12,683 ratings at 4.0/5 |
| Parallel | Freemium | AI Search & Answer Engines | Recurring monthly free allowance of several thousand requests |
| PDF.ai | Freemium | AI OCR & Document Extraction | Chat-with-PDF product plus a separate parse/extract/split PDF API |
| Perplexity | Freemium | AI Search & Answer Engines | Cited, real-time answers (1B+ queries/quarter) |
| Photomath | Freemium | AI Tutors & Learning | Free Basic plan with full step-by-step explanations and visual aids |
| Praktika | Freemium | Language Learning AI | Free tier with basic AI-avatar conversation practice, low-cost premium |
| Quizlet | Freemium | AI Tutors & Learning | AI flashcards and practice tests from notes |
| Reducto | Freemium | AI OCR & Document Extraction | 15,000 free starter credits, no card required |
| Scholarcy | Freemium | Academic Research | Auto-generates 'summary flashcards' from papers/reports in seconds |
| SchoolAI | Freemium | AI for Teachers & Classrooms | 'Spaces' let teachers design their own AI learning experiences for students |
| SciSpace | Freemium | Academic Research | Explain and chat with any paper |
| Scite | Freemium | Academic Research | 'Smart Citations' show whether a paper is supported, contrasted, or just mentioned by later work |
| Symbolab | Freemium | AI Tutors & Learning | Step-by-step explanations across algebra, calculus, trig, geometry, physics |
| TalkPal | Freemium | Language Learning AI | Supports 130+ languages for conversational AI practice |
| Tavily | Freemium | AI Search & Answer Engines | 1,000 free API credits/month, no card required |
| Turbo AI (formerly Turbolearn) | Freemium | AI Tutors & Learning | Converts uploaded PDFs/videos/recordings into notes, flashcards, quizzes, and podcasts |
| Twee | Freemium | AI for Teachers & Classrooms | Generates CEFR-aligned (A1-C2) texts, dialogues, and exercises across 10 languages |
| Undermind | Freemium | Academic Research | Exhaustive, agentic literature search |
| Upstage Document AI | Freemium | AI OCR & Document Extraction | Parse/Extract/Classify/Instruct pipeline billed per page |
| Eightify | Trial | YouTube & Content Summarizers | Summarizes YouTube videos up to 10 hours long in ~5 seconds |
| Kagi Assistant | Trial | AI Search & Answer Engines | Bundled with Kagi's paid ad-free search subscription |
| AlphaSense | Paid | Deep Research & Documents | AI search across SEC filings, earnings transcripts, broker research, private data |