Feather Sheet

FeatherSheet is a spreadsheet built in Rust, made for people who live in Excel and are tired of it freezing on big files.

Handles what Excel struggles with

• Opens millions of rows and keeps scrolling smooth
• Long formula columns calculate in the background, so the window never locks up
• Pivot tables, charts and filters stay fast on large datasets

Works with your Excel files

• Reads and writes .xlsx, .xlsm, .csv, .tsv and .parquet
• Runs Excel VBA macros, including UserForms, converted automatically
• Write your own macros in JavaScript, with a built-in editor (Alt+F11)

Everything you expect

• Hundreds of functions, in English or Portuguese, plus dynamic arrays (FILTER, UNIQUE, SORT…)
• More than 15 chart types, conditional formatting, data validation and named ranges
• Pen and ink drawing tab, with pressure support for drawing tablets

Private by design
Everything runs on your machine: no account, no login, no telemetry. Macros from a file only run after you allow them.

Open source (GPL-3.0). Report bugs and ideas at https://github.com/feather-works/feathersheet/issues