WebAssembly powered

The spreadsheet that handles anything.

Viztab is a blazing-fast spreadsheet powered by WebAssembly. Import millions of rows. Calculate with 369+ formulas. No lag.

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10M+
Rows handled
369+
Built-in formulas
50MB+
File imports
<100ms
Calculation time
Built for performance

Everything you need, nothing you don't.

Lightning Fast Engine

WASM-powered formula engine processes millions of cells instantly. No JavaScript bottlenecks.

Massive File Support

Import CSV and XLSX files with millions of rows via a streaming parser that loads data on demand.

Full Formula Engine

369+ functions including VLOOKUP, SUMIFS, INDEX/MATCH, array formulas, and more.

Charts & Visualization

Built-in charting with bar, line, pie, scatter, area, and more. Visualize your data instantly.

Desktop App

Native desktop app for macOS, Windows, and Linux. Work offline with auto-updates built in.

Works Everywhere

Use in any modern browser. No installation needed for the web version. Your data stays local.

Ready to handle your data?

Free to use in your browser. Upgrade for unlimited imports and the desktop app.

Try Viztab Free