Semantic Scholar is a free academic search engine from the Allen Institute for AI, indexing over 200 million papers across all major scientific disciplines and using AI to surface the most influential and relevant results. Its TLDR feature generates a one-sentence summary of every paper’s core contribution, allowing researchers to quickly assess relevance without reading the abstract in full. Semantic Scholar also surfaces citation velocity and influence metrics, helping researchers identify the most impactful work in a field at a glance.