Best Unriddle alternatives in 2026

Khanmigo, built by nonprofit Khan Academy, is a top-rated AI for education. Save time on prep, tackle homework challenges, and get personalized tutoring.

Quizlet is an AI-powered research tool that helps you conduct literature reviews efficiently with a free tier to get started.

Use AI to search, summarize, extract data from, and chat with over 125 million papers. Used by over 2 million researchers in academia and industry.

Consensus is an AI academic search engine for peer-reviewed literature—your research OS for finding, organizing, and analyzing science 10x faster.

Perplexity is an AI-powered research tool that helps you conduct literature reviews efficiently with a free tier to get started.

We built AskYourPDF as the only PDF AI Chat App you will ever need. Easily upload your PDF files and engage with our intelligent chat AI to extract valuable insights from your documents.

the platform that makes it super easy to convert and edit all your PDF files. Solving all your PDF problems in one place - and yes, free.

Eduaide.Ai is an AI-powered research tool that helps you conduct literature reviews efficiently with a free tier to get started.

Grade your existing paper-based assignments in half the time and see exactly what your students learned, for free.

Semantic Scholar uses groundbreaking AI and engineering to understand the semantics of scientific literature to help Scholars discover relevant research.

Scite is an AI-powered research tool that helps you conduct literature reviews efficiently with a free tier to get started.

SciSpace is an AI-powered research tool that helps you conduct literature reviews efficiently with a free tier to get started.