Free AI Tools for Citations

Perplexity is an AI-powered search engine and research assistant that provides sourced, cited answers to questions.

Google’s source-grounded AI research and note-taking assistant for summarizing, organizing, and chatting with your own documents.

ChatPDF lets you chat with PDFs to summarize, translate, and ask questions with cited answers, free to start.

Scite helps researchers search scholarly literature and evaluate claims with supporting, contrasting, and contextual citations.

iAsk AI is a free AI answer engine and homework helper that provides instant answers with citations, plus writing and grammar tools.

Jenni is an AI academic writing workspace that helps students and researchers read, draft, cite, and review papers with traceable sources.