Scholarcy is an AI tool geared specifically for academic papers. It comes with features like interactive summary flashcards, custom summaries, notes and highlighting. It also can create literature matrices and one-click bibliographies. The tool offers a free version and a paid version (Scholarcy Plus) with unlimited summarization and other advanced features.
Another good option is the AI PDF Summarizer. It's good at extracting the essence of complex PDFs, which makes it useful for academic research, business and medicine. It handles multiple languages, and you can add data sheets, quotes and deeper questions to encourage critical thinking.
If you just want a summary service, check out SciSummary. It uses large language models like GPT-3.5 and GPT-4 to generate detailed summaries of scientific papers. You can upload documents, get summaries by email and use a free trial or premium plans starting at $6.99 per month.
Finally, Semantic Scholar is a free AI-powered research service that offers brief summaries (TLDRs) along with powerful search filters and tools to organize and cite papers. It also offers AI-created definitions, research feeds and automated email alerts, so it's a good all-purpose tool for researchers.