VisiData — The Complete Guide: A Free Terminal Spreadsheet for Huge Data Files
VisiData is an open-source command-line tool for exploring and analysing tabular data — a kind of spreadsheet inside the terminal. It opens millions of rows in seconds, so it fits exactly the files where Excel gets stuck: sensor logs, data-logger files and output from long measurements.
VisiData
VisiData project
A spreadsheet in the terminal — quickly explore and clean huge CSV, Excel and log files from sensors and data loggers.
Get it from the vendorWhat you get
- Many formats — CSV, Excel, JSON, SQLite, HDF5, Shapefile and more.
- Sorting and filtering — fast, even on very large files.
- Computed columns — Python expressions, for example unit conversions.
- Plots in the terminal — histograms and scatter plots for a first look.
- Replayable steps — save the sequence of actions and run it again on the next file.
What to know
Everything is keyboard-driven, which takes some getting used to. There is no native Windows support; the site recommends installing through WSL or MSYS2. VisiData is for quick checks — before you decide to move on to full analysis in Python or LabPlot.
Related tools
To clean and combine data in a graphical interface — OpenRefine. To store data in a tidy database — DB Browser for SQLite. For report-ready plots — LabPlot.
OpenRefine
OpenRefine
Clean up messy data tables — duplicates, inconsistent names, splitting columns and conversions.
Get it from the vendor
DB Browser for SQLite
DB Browser for SQLite project
Create, browse and edit SQLite databases in a spreadsheet-like view — test results, component libraries and measurement data.
Get it from the vendor
LabPlot
KDE
Data analysis and scientific plotting in a graphical interface — a free alternative to Origin, with curve fitting and FFT.
Get it from the vendor
Python
Python Software Foundation
The language behind most modern engineering computation, and its full ecosystem.
Get it from the vendorThe bottom line
VisiData is the fastest way to look inside a huge data file and understand what is in it. Completely free, for anyone willing to work from the keyboard.