Mantle is an open-source web platform designed for the storage, sharing, and visualization of One Health biosurveillance data and is designed to meet the needs of a wide variety of users. One Health scientists in the field or the lab will be able to upload datasets in multiple formats to Mantle''s intelligent database, where they will be stored for easy download and analysis. Mantle users will be able to use fine-grained access controls to protect and share their uploaded datasets, and examine datasets in views appropriate to their content (e.g., tables, maps, and charts). Mantle''s flexible storage layer will also display spatial datasets from different data sources alongside one another, and save and export combined datasets.