ReoGrid Web — Web Spreadsheet Library Officially Released. Formulas, Excel I/O, React/Vue Support

UNVELL Inc. officially released ReoGrid Web, a spreadsheet library for web applications, on March 24, 2026.

ReoGrid Web is an Excel-like spreadsheet library that runs in the browser. The formula engine, Excel I/O, and Canvas rendering engine are all bundled into a single package, with full support for both React and Vue.

■ Key Features

Built-in formula engine: Supports key functions including SUM, AVERAGE, IF, and VLOOKUP. Cell references and formula authoring feel just like Excel.

High Excel compatibility: Reads xlsx files (Lite edition) and writes them (Pro edition), preserving cell values, formulas, styles, borders, and merged cells on import and export.

Fast Canvas rendering: Virtual scrolling keeps rendering smooth past 10,000 rows. 100,000 cells initialize in around 200ms (about 2μs per cell).

Lightweight, single package: 68KB gzip. The formula engine, Excel I/O, and React/Vue wrappers are all delivered with zero dependencies.

Native Japanese support: Number formats like ¥1,234, dates in yyyy年M月d日 form, and Japanese era support are implemented natively.

■ Editions

Three editions are available: Lite (free), Pro (from ¥88,000), and Enterprise (from ¥165,000). All are perpetual licenses.

■ Background

We have been developing ReoGrid for .NET (WinForms / WPF) since 2014, with cumulative NuGet downloads exceeding 180,000. ReoGrid Web is the result of bringing more than a decade of know-how into web technology.

See the blog post "ReoGrid Web Officially Released" for details.