Alternatives to Feynman

Perplexity is a cited AI answer engine that footnotes every AI search answer with a live source link you can verify.

Free local RAG chatbot from NVIDIA that answers questions over your own files on an RTX Windows PC

Free Stanford research prototype that turns a topic into a cited, Wikipedia-style report through simulated expert–learner AI dialogue.

Humata AI reads your PDFs and answers questions with highlighted citations back to the exact source section.

Felo is a free multilingual AI search and creation workspace that answers in your language, then turns the answer into a doc, deck, or clip.

Turn open-access research papers into audio podcasts and ask them questions by chat.

Open-source autonomous research agent that plans, reads sources in parallel, and writes cited reports you host yourself

OpenAI o1 is the 2024 chain-of-thought reasoning model — now deprecated in the API and locked to ChatGPT Plus and Pro under Legacy models.

Mochii AI is a multi-model AI assistant that puts GPT-5, Claude 4.5 and Gemini 3.0 in one chat window, from $4.99/mo

Multi-model AI chat that lets you switch between GPT-4, Claude 2, and GPT-3.5 inside one conversation.

iPhone-only AI workspace combining chat, image and video generation, research, documents, voice, and coding agents in one app.

ChatPDF turns any PDF into a chat partner: ask questions, get cited answers, summaries, and translations in seconds.

A visual knowledge base with an AI Tutor that builds structured courses from your own sources.

ChatDOC is chat-with-PDF analysis that shows the exact sentence, footnote, or table cell behind every answer.

An illustrated O'Reilly guide by Jay Alammar and Maarten Grootendorst that teaches Python developers to build and refine large language models.

A code-first Manning book that walks you through building a GPT-2 class LLM in PyTorch, line by line, without using existing LLM libraries

Email-based AI reading companion that summarizes articles, YouTube videos, and PDFs — no signup required.

Free desktop AI that runs the Mistral 7B model locally so your documents never leave your machine.

AI reading assistant that chats with your PDFs, books, and YouTube videos — with citations that jump to the exact page.

Anara is an AI research workspace that searches your library and the web and cites every answer back to the exact passage in the source.

Auditable AI knowledge layer for regulated enterprises that must defend every answer in an audit.

Otio is a persistent AI research workspace that keeps every PDF, article, video and transcript you upload in one searchable library, with page-level citations

Consensus is an AI academic search engine that answers research questions with cited evidence from peer-reviewed literature.

VectorShift is an AI operating system for private market investors, tracing every figure back to the source document and page.

Chinese-language search engine that returns cited, synthesized answers instead of link lists.

Free Chrome extension that summarizes any web page and lets you chat or talk to it by voice.

Conversational AI agent for patent search that returns cited answers from patents, papers, and code.

Genspark turns one prompt into cited research, decks, dashboards and no-code agents inside a single AI workspace.

Chat with any PDF and pull structured data from it, via web app, Chrome extension or REST API.

Mindy was an email-first AI research agent launched in 2023; the standalone product is discontinued and the team joined WorkWhile.