Preswald packs Python-based data applications into self-contained HTML files running locally in the browser with compute, data access, and UI components.
What it is
Preswald is an open-source static-site generator and WebAssembly packager designed for interactive Python data applications. It bundles complete data workflows, calculations, and visual interfaces into single static files that run locally inside the browser. By utilizing Pyodide and DuckDB together with visualization libraries like Plotly and Matplotlib, Preswald allows developers to build functional dashboards, reports, and notebooks that operate entirely offline without requiring a dedicated server.
Key features
- Package Python data applications directly into static HTML files
- Execute workloads entirely inside the browser using Pyodide and DuckDB
- Utilize a reactive engine driven by a dependency graph to recompute only necessary parts
- Access built-in UI components including tables, charts, and forms
- Operate offline without needing any backend server infrastructure
Who it's for
Preswald fits developers and data analysts who need to share interactive dashboards as standalone files or perform local-only analysis on sensitive datasets without exposing information to external servers.
Pricing
Preswald is free and open source under the Apache-2.0 license.
Use cases
- Package Python data workflows into single files
- Build interactive browser dashboards
