Work with CSVs?
Never open Excel again.

What if working with a CSV felt as natural as opening a text file? Cassava combines the speed and precision of your favorite code editor with the ergonomics of a native spreadsheet.

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Cassava showing a CSV file in a native spreadsheet interface Cassava showing a CSV file in a native spreadsheet interface, dark mode

Built for CSVs and the users who ❤️ them

CSVs power everything from analytics exports to migration data, but the tools are often a poor fit. Classic spreadsheet editors are slow and bloated, text editors hide structure Cassava gives CSVs a native workspace: fast to open, easy to navigate, and powerful enough to get your work done.

SPEED

Open and edit massive files quickly

Cassava is built as a native desktop application, not a web app wrapped in a browser shell. Open large CSVs, move through dense tables, and keep editing without waiting for a full office suite to catch up.
SHORTCUTS

Feels familiar from the first minute

Cassava supports the muscle memory you already have: spreadsheet shortcuts for cells and ranges, text-editor shortcuts for finding and selecting, and a command palette for everything else.
EXPRESSIONS

Solve expressions inline

Use cells as lightweight scratch space. Enter an expression, solve it inline, and keep moving — no context switch, no separate calculator, no heavyweight formula ceremony.
FIND + FILTER

Find, replace, filter, and sort without writing a script

Search within the current file or across all open files, replace text, step through matches, or select every match at once. Filter rows and columns with globs, exact strings, numeric comparisons, boolean operators, and grouped conditions; then sort, reverse, shuffle, deduplicate, or clear sorts when you need the original order back.
ANALYSIS + VISUALIZATION

Analysis and visualization

Inspect files before you trust them with built-in statistics for numeric columns, selected cells, unexpected values, and summaries. Create quick charts and pivot tables from the data you already have open to understand distribution, outliers, trends, categories, totals, counts, and relationships.
NATIVE UI

Comfortable all day

Light mode, dark mode, themes, zebra striping, active row and column highlighting, adjustable cell dimensions, and responsive native UI details make dense files easier to work with for long sessions.

A native spreadsheet for delimited data.

Cassava starts from two simple premises:

  1. CSVs deserve to be treated as first-class spreadsheets.
  2. Working with spreadsheets should feel as fast and intuitive as your code editor.

That makes Cassava the perfect tool to:

  • open and inspect large CSV, TSV, and tabular text files
  • clean data before import or handoff
  • edit CSV-based configuration files
  • run quick calculations with inline expression solving
  • find, replace, filter, and sort without writing a script
  • analyze files with statistics and aggregates
  • create charts from open data
  • summarize datasets with pivot tables
  • copy selections as CSV, Markdown, or HTML
  • save selected or visible data into new files

Cassava is for the people who know CSVs are everywhere — and want a tool that treats them with the care, speed, and precision they deserve.

Free forever for everyday CSV work

Stop waiting on spreadsheets.

Open massive CSVs quickly, edit them precisely, analyze them in place, and move through data with the speed of a native app.

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