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IronCalc — rebuild spreadsheet infrastructure as a reusable Rust engine

OSS scale score 194.5OSS health 89Update pace 71 commits/30d
About these scores

OSS scale score is an unbounded metric that log-compresses and weights Stars, Watchers, Forks, and Contributors. Discovery score is the current OSS scale score minus the score at discovery. Update pace is commits in the last 30 days, growth momentum is the OSS scale score difference within the recent observation window, and OSS health is a 0–100 rating based on available recency, Community Health, and release data.

Stars
4,166
Primary language
Rust
License
Apache-2.0
Repository last updated
Sep 20, 2026

Overview

IronCalc is a Rust project implementing a spreadsheet calculation engine plus XLSX reading and writing, with an architecture intended for reuse from Rust, WebAssembly, and multiple language environments.

Features and best fit

Based on official documentation; not hands-on tested · Content checked:

Use spreadsheet models and formula calculation as a library

Cells, sheets, formulas, and evaluation can be manipulated through the Rust API for embedding inside other applications.

Sources: [2][3]

Extend into XLSX interoperability and browser previews

The repository includes XLSX reading/writing and provides an early browser preview that can be run through Docker.

Sources: [2]

For developers embedding spreadsheet capabilities into web or native products

It fits teams that need a reusable calculation and file-compatibility layer rather than embedding a complete office suite.

Sources: [2]

Evaluate it as work in progress and account for the dual license

The README explicitly describes IronCalc as work in progress. Users may choose either MIT or Apache-2.0 licensing.

Sources: [2][4][5]

Official sources

  1. [1]ironcalc/IronCalc repository(2026-09-21)
  2. [2]IronCalc README(2026-09-21)
  3. [3]IronCalc Rust API documentation(2026-09-21)
  4. [4]IronCalc MIT license(2026-09-21)
  5. [5]IronCalc Apache-2.0 license(2026-09-21)
Supplemental curator note

IronCalc is not a finished office suite; it is a work-in-progress spreadsheet engine and toolset intended for reuse in many environments. The repository is dual-licensed at the user's option under MIT or Apache-2.0, so it is stored as `NOASSERTION` rather than flattened to one license identifier.

Try it in 3 steps

  1. 1

    Get the source

    git clone --depth 1 https://github.com/ironcalc/IronCalc.git
  2. 2

    Enter the repository

    cd IronCalc
  3. 3

    Check the official steps

    Continue with the commands in the README Installation, Quick Start, or Getting Started section.

    find . -maxdepth 1 -iname 'README*' -exec sed -n '1,220p' {} \; -quit
Check the official README

Growth

Growth trends · Last 30 days

4,166 Stars

Trend data is still being collected.

Development activity

Last 90 days · weekly

Commits (last 30 days)
71
Open PRs
23

Development activity is still being collected.

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GitHub data

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GitHub Topics

  • self-hosted
  • react
  • rust
  • spreadsheet
Stars
4,166
Forks
184
Watchers
14
Open issues
234
Contributors
35
Primary language
Rust
License
Apache-2.0
Repository last updated
Sep 20, 2026
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