# ironcalc/IronCalc

Main engine of the IronCalc ecosystem

Repository: https://github.com/ironcalc/IronCalc
Canonical: https://ross.abutalabs.com/products/ironcalc
Homepage: https://www.ironcalc.com
Language: Rust
License: Apache-2.0
License Family: permissive
Topics: self-hosted, react, rust, spreadsheet
Last push: 2026-08-26T15:30:34+00:00

## Health v2 (maintenance only)
Score: 93/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 99, release rhythm 96, longevity 72
- inputs: {"age_days": 1017, "days_push": 7, "days_rel": 30, "gap_med": 17.0, "n_releases_24m": 11}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 4123, forks 178 (observed 2026-08-28T04:08:35.997091+00:00)

## What it is
IronCalc is an open-source spreadsheet engine written in Rust with xlsx import/export, usable headlessly or embedded via Rust, Python, JavaScript (WASM), and Node.js bindings. It also ships a self-hostable web spreadsheet application built on the engine.

## Use cases
- generate xlsx reports programmatically
- embed a spreadsheet in a web app
- evaluate Excel formulas headlessly
- self-host an online spreadsheet
- read and write xlsx files from Rust or Python
- run spreadsheet calculations in the browser via WebAssembly

## When to choose
- you need an Excel-compatible calculation engine with minimal dependencies
- you want to embed spreadsheet logic in a SaaS or internal tool
- you need xlsx import/export across multiple languages
- you want a self-hosted, open-source spreadsheet alternative

## When to avoid
- you need full Excel feature parity - some features are still missing
- you need mature real-time collaboration today
- you need a battle-tested engine for critical legacy workbooks

## Facets
- artifact type: library
- maturity: active
- function: parser, sdk, developer-tools
- domain: spreadsheets, developer-tools, web-development, cross-platform
- platform: rust, python, wasm, browser, cross-platform, self-hosted
- tags: spreadsheet-engine, xlsx, excel-compatible, formula-evaluation, react, embeddable, headless-calculation, nodejs, docker

## Member repositories
- ironcalc/IronCalc (main) score 93

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:08:35.997091+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T18:23:05.594625+00:00, confidence not recorded.
  - readme: https://github.com/ironcalc/IronCalc (fetched 2026-08-28T04:08:35.997091+00:00, sha 618aad4a2fd8)
  - homepage: https://www.ironcalc.com (fetched 2026-08-29T09:14:25.471533+00:00, sha 3bb6a265a8c1)
  - site_page: https://www.ironcalc.com/about.html (fetched 2026-08-29T09:14:25.480843+00:00, sha e7edc4385d12)
  - site_page: https://docs.ironcalc.com/ (fetched 2026-08-29T09:14:25.482725+00:00, sha 8c0e9fb8251c)
  - site_page: https://docs.ironcalc.com/web-application/importing-files.html (fetched 2026-08-29T09:14:25.484491+00:00, sha 66166a7169b3)
  - site_page: https://docs.ironcalc.com/programming/about.html (fetched 2026-08-29T09:14:25.486183+00:00, sha 4bfd66860fa9)
  - registry_crates: https://crates.io/api/v1/crates/ironcalc (fetched 2026-08-29T09:14:25.487816+00:00, sha 3e2eac32e383)
- Data as of 2026-08-30T08:39:29.467469+00:00.