Catch broken DOIs and PMID mismatches before you submit. If a sentence in your manuscript needs a source, or your reference list may have wrong DOIs, PMIDs, or titles, LitSource helps you fix that before reviewers do. Paste a claim or research question and get candidate papers with enough context to judge relevance (including PubMed-backed results where available). Run a citation check that compares each reference against DOI, PMID and scholarly metadata and highlights what it cannot confirm so you can review manually. Export what you keep into your reference manager. Free tier for getting started; paid credits when you need more searches.