perspective

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Perspective is an open-source data grid, pivot table and charting component for 
large, real-time and streaming datasets. Build user-configurable reports, 
dashboards, notebooks and embedded analytics applications, backed by a 
high-performance streaming query engine that runs in-browser via WebAssembly or 
server-side in Python, Node.js and Rust — or delegates to a database you 
already have.

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<a href="https://perspective-dev.github.io"><picture>
    <source media="(prefers-color-scheme: dark)" srcset="https://perspective-dev.github.io/projects/dark/collage.png" />
    <img alt="A collage of Perspective data grids, pivot tables, charts and maps" src="https://perspective-dev.github.io/projects/light/collage.png" />
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## Features

- A data-reactive UI packaged as a
  [Custom Element](https://developer.mozilla.org/en-US/docs/Web/Web_Components/Using_custom_elements),
  with drag-and-drop query and layout configuration. Includes a virtual-scrolling,
  editable data grid, WebGL charting engine with 15+ chart types, tile-based
  geographic maps, full theme support, and [React](https://react.dev/) bindings.

- A fast, memory-efficient streaming query engine written in C++ and compiled
  for [WebAssembly](https://webassembly.org/) (including a 64-bit `memory64`
  build for in-browser datasets larger than 4GB, and support for paging
  columns to disk via OPFS in the browser or memory-mapped files natively),
  [Python](https://www.python.org/) and [Rust](https://www.rust-lang.org/).
  Tables update incrementally and views tick in real time, with reactive
  joins across tables, a columnar expression language based on
  [ExprTK](https://github.com/ArashPartow/exprtk), and read/write/streaming
  support for [Apache Arrow](https://arrow.apache.org/), CSV and JSON.

- A symmetric client/server architecture — the same Client API connects to an
  engine in-process, in a Web Worke