VisiLens – Local-first, high-speed CSV and Parquet data explorer

Summary: VisiLens is a local-first data explorer that opens over 1 million rows in under 2 seconds by streaming data from the VisiData engine. It provides a modern web GUI for sorting and filtering without requiring CLI knowledge, while ensuring data privacy by running entirely on the user’s machine.

What it does

VisiLens combines the VisiData engine’s fast streaming architecture with a virtualized React web interface, enabling quick exploration of large CSV, Parquet, Excel, and JSON files without configuration. It runs a local FastAPI server to process data securely.

Who it's for

It is designed for developers and data users who need to quickly inspect large datasets without slow Excel or coding in Pandas.

Why it matters

VisiLens addresses the limitations of Excel’s performance on large files and the complexity of coding for quick data previews by offering a fast, private, and user-friendly alternative.