GitHub - samuelcolvin/spread: Spreadsheet viewer, in Rust using GPUI · GitHub
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samuelcolvin
spread
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.pre-commit-config.yaml
.pre-commit-config.yaml
AGENTS.md
AGENTS.md
CLAUDE.md
CLAUDE.md
Cargo.lock
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Cargo.toml
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README.md
README.md
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spread
A simple, fast spreadsheet viewer written in Rust using GPUI.
Editing is not supported.
Note<br>As with most things in 2026, the code here was almost entirely written by AI - using both Codex + GPT-5.5 and Claude Code + Opus 4.7 1M.
Why
I wanted a quick way to view spreadsheets locally, without the need to open a document in Google sheets.
Features:
supports CSV, Parquet, and XLSX file formats
loads 30M row Parquet files in 100ms
supports copy and paste to Google sheets or excel
displays formatting such as dates, currency, percentages, bold text, colors, and column/row dimensions
--display xml mode from the CLI to make it easy for LLMs to "view" spreadsheets
Example of rendering xlsx file
Example of rendering large Parquet file
Usage
Install the binary locally:
make install-macos
(If you're not on macOS, your mileage may vary, try make install-cli instead.)
On macOS, this also installs Spread.app to ~/Applications, registers it with Finder, and sets it as the default app for .xlsx, .csv, and .parquet when duti is installed. Without duti, use Finder's Get Info panel to choose Spread and click "Change All...".
Then open a file with:
spread path/to/file.xlsx
or:
spread path/to/file.csv
or:
spread path/to/file.parquet
Useful CLI modes:
spread --list-sheets path/to/file.xlsx<br>spread --sheet Summary path/to/file.xlsx<br>spread --sheet 2 --display json path/to/file.xlsx<br>spread --sheet 2 --display xml path/to/file.xlsx<br>spread --sheet 2 --display table path/to/file.xlsx<br>spread --display audit path/to/file.xlsx
--sheet accepts a sheet name or 1-based sheet index. --display can be gui, json, xml, table, or audit.
About
Spreadsheet viewer, in Rust using GPUI
Resources
Readme
License
MIT license
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Languages
Rust<br>96.3%
Python<br>2.4%
Other<br>1.3%
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