Perplexity
AI Search & Answer Engines
- Cited, real-time answers (1B+ queries/quarter)
- Focus modes and file uploads
- Comet browser and Spaces
- Strong free tier
Research & Learning (95)
94 free research & learning tools and 6 more — pricing tier and real capabilities on every entry. No ads, no sponsored placement.
AllAI Search & Answer EnginesDeep Research & DocumentsAcademic ResearchAI Tutors & LearningAI OCR & Document ExtractionAI for Teachers & ClassroomsLanguage Learning AITravel PlanningAI Shopping AssistantsYouTube & Content SummarizersScience & Research AI
freemium
ChatGPT Search
AI Search & Answer Engines
- Real-time web answers inside ChatGPT
- Inline citations and follow-ups
- Combines search with reasoning
- Available on the free tier
Grok DeeperSearch
AI Search & Answer Engines
- Live search across X and the open web
- Best for breaking news and trends
- Reasoned, sourced summaries
- Free daily queries
Komo
AI Search & Answer Engines
- Fast, ad-free AI search
- Explore, chat and research modes
- Privacy-oriented
- Free to use
Kagi Assistant
AI Search & Answer Engines
- Bundled with Kagi's paid ad-free search subscription
- Lets users pick underlying model (Claude, GPT, Gemini)
- Deep research/thread mode with citations
Exa
AI Search & Answer Engines
- Search API built specifically for AI agents/LLMs, not humans
- Indexes 80B+ documents, sub-180ms answers
- Structured JSON extraction across companies/code/docs
Tavily
AI Search & Answer Engines
- 1,000 free API credits/month, no card required
- Search + Extract + Research + Crawl + Map endpoints
- 300M+ monthly requests, 2M+ developers
Parallel
AI Search & Answer Engines
- Recurring monthly free allowance of several thousand requests
- Deep research + entity monitoring with webhooks
- Confidence-scored 'Basis' source verification framework
Felo
AI Search & Answer Engines
- Free multilingual AI search & creation platform
- Combines search with document/content creation tools
- Strong traction in Japan/Asia markets
Scira
AI Search & Answer Engines
- Free, no credit card required
- Open-source (git.new/scira)
- Multi-mode search: web, Reddit, academic papers, video, fact-check
Morphic
AI Search & Answer Engines
- Open-source, Apache 2.0, self-hostable generative-UI search engine
- 9k+ GitHub stars, actively maintained
- Pluggable model (OpenAI/Anthropic/Gemini/Ollama) and search backends (Tavily/Brave/Exa)
Perplexica
AI Search & Answer Engines
- MIT-licensed, fully self-hostable open-source Perplexity clone
- Runs with local LLMs via Ollama or cloud providers
- Uses SearxNG for private, ad-free web search
iAsk.ai
AI Search & Answer Engines
- Free AI answer engine aimed at students/researchers
- Cited, checkable sources with no data storage claim
- Built-in AI video tutor and PDF/document analysis
- Ad-free AI search with direct answers
- Built-in slide presentation and video generation
- File upload and API access
- Free to use
- Calls 16+ Chinese large models (Doubao, Ernie, Qwen, MiniMax) in one search
- Multi-model debate and brainstorm modes
- Text, voice, photo and video search
- Generates web pages, videos, images and PPTs from queries
- Ad-free AI answers built on Baidu Search, Wenku, Health and Law content
- Powered by Baidu's ERNIE models
- Available on Baidu app, desktop and mobile web
- Free for all users per Baidu's free-chatbot policy
ChatGPT Deep Research
Deep Research & Documents
- Runs up to ~30 min for exhaustive reports
- Browses hundreds of sources
- Structured, cited long-form output
- Limited runs on lower tiers
Gemini Deep Research
Deep Research & Documents
- Multi-step research across the web
- Editable research plans
- Long, organized reports
- Available with Gemini
NotebookLM
Deep Research & Documents
- Grounded answers from your own sources
- Audio Overviews (podcast-style)
- Mind maps and study guides
- Free tier available
ChatPDF
Deep Research & Documents
- Chat with any PDF or document
- Cited answers with page references
- Summaries and key points
- Free daily PDFs
STORM (Stanford)
Deep Research & Documents
- MIT-licensed open-source system that researches a topic and writes a full cited report
- Perspective-guided simulated conversations to deepen research before writing
- Co-STORM variant adds human-AI collaborative curation
- Planner and executor agents gather from 20+ web sources
- Produces cited reports exported as PDF, Word or Markdown
- Also researches local PDFs, text and Excel files
- Works with many LLM providers; Apache 2.0
- 30.5B-parameter MoE agent (3.3B active) with 128K context for long-horizon research
- Free demos on Hugging Face Space and ModelScope
- Also reachable through OpenRouter API
- Apache 2.0; ReAct and IterResearch Heavy modes
- Deep research agent with up to 300 tool calls per task and 256K context
- Scores 74.0 on BrowseComp and 75.3 on BrowseComp-ZH (v1.7)
- Free online demo at dr.miromind.ai
- Apache 2.0
- Self-hosted NotebookLM alternative over PDFs, video, audio and web pages
- Works with 18+ AI providers including Ollama
- Generates podcasts with 1 to 4 speakers
- MIT licensed with REST API
- AI workbench that searches, reads and writes from a personal knowledge base
- Dual engine with Tencent Hunyuan and DeepSeek-R1
- Shared knowledge bases; Windows, Android and mini-program apps
- 2GB free cloud storage at launch
Elicit
Academic Research
- Find and summarize research papers
- Extract data across studies
- Systematic-review workflows
- Free monthly credits
Consensus
Academic Research
- Answers grounded in peer-reviewed papers
- Consensus Meter across studies
- Study snapshots and quality
- Free searches
SciSpace
Academic Research
- Explain and chat with any paper
- Literature review and comparison tables
- Paraphrase and citation help
- Free tier
Undermind
Academic Research
- Exhaustive, agentic literature search
- Finds hard-to-surface papers
- Explains why each result matters
- Free searches to start
Semantic Scholar
Academic Research
- Fully free AI-powered search across 237M+ scientific papers
- Semantic Reader augmented-reading tool for papers
- Free public API used by many other research tools
ResearchRabbit
Academic Research
- Visual citation-network mapping across 310M+ papers
- Zotero integration for reference management
- Used by 1M+ researchers at Harvard/Stanford/MIT/Oxford, free to sign up
Connected Papers
Academic Research
- Visual graph of related papers built from co-citation analysis
- Free graphs per month before requiring paid Academic/Pro plan
- Prior-work and derivative-work graph views
Litmaps
Academic Research
- Network-map visualization of citations across a research topic
- Automatic monitoring/alerts for new relevant papers
- 350,000+ researchers across 150 countries
Scholarcy
Academic Research
- Auto-generates 'summary flashcards' from papers/reports in seconds
- Chrome extension for one-click summarization while browsing
- Free tier for individual summaries; paid for libraries/teams
Ai2 Paper Finder (Asta)
Academic Research
- Agentic literature-search tool built by Ai2, now folded into the broader 'Asta' research-agent platform
- Free to use, iteratively expands/narrows search based on natural-language queries
- Built on Semantic Scholar's corpus
alphaXiv
Academic Research
- Free overlay for arXiv papers with public discussion/comment threads per paper
- Personalized research feed and researcher-follow system
- Browser extension and MCP server for agent integration
Emergent Mind
Academic Research
- Surfaces trending arXiv papers with video/whiteboard-style explainers
- Aggregates social-media discussion signal per paper
- Free basic access with a separate paid pricing tier
- RAG over PDFs with in-text citations grounded in passages
- Agentic search that iteratively refines evidence
- Integrates academic metadata for citation tracking
- Apache 2.0; calendar-versioned release Dec 2025
- AI rewriting, translation and citation finding for manuscripts
- MS Word add-in and Chrome extension for Docs and Overleaf
- Free plan: 5 AI uses per day and 200 language suggestions per month
- PDF chat, plagiarism and AI detection on paid tiers
- Cited answers linked to exact passages in papers and uploaded files
- Searches PubMed, arXiv and JSTOR; Zotero and Mendeley connectors
- Permanent free tier with 20MB/120-page imports
- Benchmarked 97% multi-document answer correctness (vendor claim)
Khanmigo
AI Tutors & Learning
- Socratic AI tutor from Khan Academy
- Guides instead of giving answers
- Teacher tools included
- Free for teachers; low-cost for learners
Google LearnLM
AI Tutors & Learning
- Learning-tuned tutoring in Gemini
- Guided Learning and study modes
- Step-by-step explanations & quizzes
- Free with Gemini
Quizlet
AI Tutors & Learning
- AI flashcards and practice tests from notes
- Q-Chat tutor and study guides
- Learn mode adapts to you
- Free core features
ChatGPT Study Mode
AI Tutors & Learning
- Socratic step-by-step tutoring mode built into ChatGPT rather than direct answers
- Available to Free, Plus, and Pro ChatGPT users
- Distinct product surface from the base ChatGPT entry already listed
Photomath
AI Tutors & Learning
- Free Basic plan with full step-by-step explanations and visual aids
- Camera-based problem scanning including word problems
- Covers elementary through college-level math (algebra to calculus)
Symbolab
AI Tutors & Learning
- Step-by-step explanations across algebra, calculus, trig, geometry, physics
- Multiple input methods: typed, natural language, or photo
- AI chat support for follow-up questions on a solution
Knowt
AI Tutors & Learning
- Positions as the free Quizlet alternative, with unlimited learn mode/practice tests free
- AI lecture notetaker transcribes and generates flashcards from recordings
- 1M+ users, ~50% of AP test-takers used it in May 2025
Turbo AI (formerly Turbolearn)
AI Tutors & Learning
- Converts uploaded PDFs/videos/recordings into notes, flashcards, quizzes, and podcasts
- AI lecture notetaker records and organizes notes live
- 10M+ learners, rebranded from Turbolearn to Turbo AI in 2026
AskYourPDF
AI OCR & Document Extraction
- Chat with any PDF plus auto-fill PDF forms
- Embeddable document chatbot for websites
- 5M+ users including MIT/Harvard/Oxford/Stanford
PDF.ai
AI OCR & Document Extraction
- Chat-with-PDF product plus a separate parse/extract/split PDF API
- Popular ChatPDF-category alternative with API access for developers
Humata
AI OCR & Document Extraction
- Free tier: 60 pages, 10 answers, no card
- Cited answers across many uploaded files at once
- Paid tiers priced per extra page rather than per seat
Mistral OCR 4
AI OCR & Document Extraction
- Self-hostable single-container OCR model for regulated industries
- 170 languages, bounding boxes and per-field confidence scores
- Low per-thousand-page API pricing; free to try inside Le Chat
LlamaParse
AI OCR & Document Extraction
- Parses 90+ formats incl. complex tables/charts/handwriting into clean markdown
- 300,000+ users, 1B+ documents processed
- Free trial credits via LlamaCloud, then usage-based
Reducto
AI OCR & Document Extraction
- 15,000 free starter credits, no card required
- Citation-ready structured JSON across 30+ file types
- Edits extracted data back into original PDF/DOCX layout
Mathpix
AI OCR & Document Extraction
- Specializes in STEM: equations, chemistry structures, handwriting to LaTeX/text
- Desktop Snip app plus Convert/Files developer APIs
- 50B+ pages processed, 5M+ users
olmOCR
AI OCR & Document Extraction
- Apache 2.0 open-source OCR toolkit from Ai2, 19.3k GitHub stars
- Vision-language-model based, handles equations/tables/multi-column layout
- Runs at a fraction of commercial OCR cost on a 7B model
Docling
AI OCR & Document Extraction
- MIT-licensed, 64.7k GitHub stars, IBM Research-originated, now under LF AI & Data Foundation
- Advanced PDF layout + table structure recognition, local execution
- Exports to Markdown/HTML/JSON, integrates with LangChain/LlamaIndex
Marker
AI OCR & Document Extraction
- Apache-2.0 code, 38.7k GitHub stars, converts PDFs/DOCX/PPTX/XLSX to markdown/JSON
- 76.0% accuracy on the olmocr-bench benchmark
- Runs on GPU, CPU, or Apple Silicon; optional LLM-boosted accuracy mode
Upstage Document AI
AI OCR & Document Extraction
- Parse/Extract/Classify/Instruct pipeline billed per page
- Classify and Instruct currently free in beta
- Free 1-year access to Document Parse for schools/hospitals/nonprofits
- Converts PDF, Office files, images, audio and HTML into LLM-friendly Markdown
- Ships an MCP server for agents
- Open-source Python package and CLI
- Optional LLM-based image description
- Python library extracting structured data from unstructured text with LLMs
- Maps each extraction to its exact source span
- Works with Gemini, OpenAI and local Ollama models
- Interactive HTML visualization of results
- Parses PDFs, images and Office files into Markdown, JSON, HTML or LaTeX
- Runs fully locally with OCR, table and formula recognition
- Free hosted web app at mineru.net plus agent-ready outputs
- Version 4.0 adds four parsing quality tiers
- 3B vision-language model for layout parsing across many scripts
- Converts charts and diagrams into SVG code
- Scores 83.9 on olmOCR-bench
- MIT licensed with free live demo
- Vision-language OCR that compresses document context optically
- Document-to-Markdown, layout detection and figure parsing
- Multiple resolution modes up to 1280x1280
- MIT license; DeepSeek-OCR2 released Jan 2026
- 1B-parameter document parsing VLM (NaViT encoder + ERNIE-4.5-0.3B)
- Handles text, tables, formulas, charts and handwriting
- Supports 109 languages including Hindi and Arabic
- Apache 2.0; newer PaddleOCR-VL-1.6 available
- Two-stage document-type and layout analysis then element parsing
- Page-level and element-level parsing modes
- Hugging Face Transformers integration
- MIT licensed; Dolphin-v2 released Dec 2025
- Converts images and PDFs to HTML, Markdown or JSON with layout
- Handles tables, forms and handwriting in 90+ languages
- 85.8% on olmOCR benchmark (Chandra 2, Mar 2026)
- Free playground at datalab.to; open weights under modified OpenRAIL-M
- 650M-parameter OCR VLM covering 90+ languages
- Layout analysis, reading order and table recognition
- 83.3% on olmOCR-bench
- Free playground at datalab.to; weights free for research, personal use and small startups
MagicSchool AI
AI for Teachers & Classrooms
- 80+ free AI tools for teachers: lesson planners, rubric generators, writing feedback
- FERPA/COPPA compliant, doesn't train on student/teacher data
- Reports 7-10 hours/week saved per teacher across 20+ major school districts
Brisk Teaching
AI for Teachers & Classrooms
- Works inside Google Docs/Slides/Classroom and Microsoft Word/PowerPoint via extension
- Adjusts reading levels, translates content, gives personalized student feedback
- 2M+ teachers, 20,000+ school districts, 93% Common Sense Privacy Rating
SchoolAI
AI for Teachers & Classrooms
- 'Spaces' let teachers design their own AI learning experiences for students
- 'Mission Control' dashboard tracks live student engagement/progress
- ESSA Level III validated for improving critical thinking; free teacher tier
Curipod
AI for Teachers & Classrooms
- Generates teacher-led interactive lessons aligned to 55+ curricula
- Real-time AI feedback on student writing during class discussion
- Reports 23-point gains on state reading/writing tests, largest for lowest performers
Twee
AI for Teachers & Classrooms
- Generates CEFR-aligned (A1-C2) texts, dialogues, and exercises across 10 languages
- AI auto-grading for multiple-choice, written, and gap-fill responses
- 500,000+ teachers, 6M+ exercises created, ~5 hrs/week saved claimed
- Generates lesson plans, slides, quizzes and worksheets
- Aligned to England's national curriculum and exam boards
- Draws on Oak's library of teacher-made content
- Free for UK teachers; non-UK users get a demo account with three lesson plans
- Teacher-configured AI tutors and feedback tools for students
- Free access for up to 80 users (teachers or students)
- Paid tiers add SIS/LMS integration and analytics
- K-12 focused
ELSA Speak
Language Learning AI
- Free plan includes AI role-play conversations and real-time pronunciation feedback
- Speech-analysis engine trained specifically on English pronunciation accuracy
- 92M+ downloads, 4.9-star rating, content from HarperCollins/Pearson/Oxford
Praktika
Language Learning AI
- Free tier with basic AI-avatar conversation practice, low-cost premium
- Real-time pronunciation feedback and structured speaking/reading/listening lessons
- Positions itself as a low-cost alternative to private tutoring
TalkPal
Language Learning AI
- Supports 130+ languages for conversational AI practice
- Free tier plus a 14-day free trial of premium features
- 10M+ users, 4.7 app-store rating, 300+ unique conversation scenarios
- Tiny Lesson: situational vocabulary and grammar on demand
- Slang Hang: realistic native-speaker conversations
- Word Cam: photo an object to get its label in the target language
- Around 15 languages in the browser
Mindtrip
Travel Planning
- Conversational itinerary building with live maps/booking links in one thread
- ~350K monthly US visitors in its first 5-6 months per Ahrefs traffic data
- Named to Fast Company's Most Innovative Companies list
GuideGeek
Travel Planning
- 1M+ consumer users per vendor, live since April 2023 (longer track record than most AI trip tools)
- Partners with 60-70 tourism boards to power destination-specific conversational AI
- Built by travel publisher Matador Network, not a pure AI startup
- Day-by-day itineraries from destination, budget and interests
- Accommodation suggestions and editable plans
- Download itinerary as PDF for offline use
- Free with account; vendor says free 'for now'
Amazon Rufus
AI Shopping Assistants
- Amazon's AI shopping assistant, now branded Alexa for Shopping (formerly Rufus)
- Free for all Amazon customers in the Amazon app and website, no Prime membership required
- Answers product questions and compares items using catalog data and reviews
- Helps find gifts and recommendations conversationally
Phia
AI Shopping Assistants
- Chrome extension + iOS app that surfaces resale/secondhand alternatives while shopping
- 300K-500K+ downloads within its first year per multiple 2026 reports
Daydream
AI Shopping Assistants
- Proprietary fashion-trained AI understands cut/color/occasion, not generic product search
- Search across 10,000+ vetted brands and 2M+ items
- First third-party app to integrate Apple Visual Intelligence for shopping (Nov 2025)
NoteGPT
YouTube & Content Summarizers
- 400,000 active Chrome Web Store users as of Jul 2026, ~12,683 ratings at 4.0/5
- Batch-summarizes up to 20 videos at once, works even on videos without captions
- Bundles summaries with flashcards, mind maps and slide generation, not just text output
Glasp
YouTube & Content Summarizers
- 2M+ users per vendor; free web/PDF/Kindle highlighter with a social discovery layer of other users' highlights
- AI YouTube-summary feature using ChatGPT/Claude alongside its core highlighting product
- Cross-browser support (Chrome, Firefox, Edge, Safari, Brave, Opera)
- Summarizes YouTube videos, articles and PDFs into a linked knowledge graph
- Free forever plan: 10 AI summaries per month, unlimited saving and notes
- API and MCP access even on the free plan
- No credit card required
AlphaFold Server
Science & Research AI
- Free browser-based access to AlphaFold 3-class structure prediction for non-commercial research
- Predicts structure/interactions of proteins, DNA, RNA, ligands in one model
- Backed by the AlphaFold Protein Structure Database of 200M+ predicted structures
Boltz
Science & Research AI
- First fully open-source model to approach AlphaFold3-level structure prediction, MIT-licensed
- Boltz-2 adds binding-affinity prediction, not just structure
- Hostable free via community web apps (e.g. Tamarind Bio) or run locally
Chai-1 (Chai Discovery)
Science & Research AI
- Chai-1 is free, Apache-2.0-licensed for academic and commercial use — a genuinely open structure-prediction model
- Chai-2 (paid, enterprise) generates de novo antibodies directly from target epitopes, used by Lilly, Novartis, Pfizer
- General-purpose biomedical agent combining LLM planning with code execution
- Integrates 150+ bioinformatics tools and 59 databases
- Web interface so biologists can use it without coding
- Open-source from Stanford SNAP lab
- DNA language model at single-nucleotide resolution with 1M base-pair context
- Variant effect prediction, sequence completion and genome design
- Free hosted 40B access via NVIDIA build.nvidia.com
- Apache 2.0 code, weights and training data open; published in Nature
- Agentic tree search proposes ideas, runs experiments and writes papers
- No human-authored templates needed
- Open code from Sakana AI
- Requires disclosure of AI use in resulting papers
Research & Learning — straight answers
What research & learning tools does Flocci list?
Flocci AI Tools lists 100 research & learning tools, ordered free tiers first: Ai2 Paper Finder (Asta), Aila (Oak National Academy), AlphaFold Server, alphaXiv and Biomni. 94 of the 100 are free or have a free tier. Every entry states what it uniquely does, not a score.
Which research & learning tools are completely free?
Yes — 40 of these are marked fully free with no paid plan attached: Ai2 Paper Finder (Asta), Aila (Oak National Academy), AlphaFold Server, alphaXiv and Biomni. The rest are freemium, trial or paid, and each row states which.
How is Research & Learning organised?
Into 11 sub-categories — AI Search & Answer Engines, Deep Research & Documents, Academic Research, AI Tutors & Learning, AI OCR & Document Extraction, AI for Teachers & Classrooms, Language Learning AI, Travel Planning, AI Shopping Assistants, YouTube & Content Summarizers, Science & Research AI — holding 100 tools between them. Each sub-category has its own page with the same pricing labels and capability lists.