QECirc is an open, community-driven library that helps quantum error-correction researchers find reusable circuits for designing fault-tolerant computation. Its collection spans 82 error-correcting codes and includes circuits for encoding, state preparation, syndrome extraction, and flag gadgets. Users can search and filter 968 circuits by code, tags, or practical metrics such as gate count, two-qubit gate count, circuit depth, and qubit count.

Each circuit includes its source and is available in STIM and QASM formats, with links to view it in Crumble or Quirk. Researchers can save favorites in their browser, export or import lists, and download selected circuits together. QECirc also catalogs tools used to synthesize circuits, connecting entries to relevant papers and repositories.

The library draws on published research and circuit-generation tools, and welcomes individual submissions and full datasets through an open contribution process. Maintainers review submissions and handle ingestion, with circuits credited to their sources. By organizing circuits, documentation, and provenance in one searchable resource, QECirc supports comparison, reuse, and collaboration across the quantum error-correction research community