IronCalc
Fewer than 5 people recommend it so far, so there's no written verdict. Here is what commenters said.
Why people recommend it
“IronCalc looks better than LO Calc performance wise”
“And the project looks interesting and worthy to me.”
Show 3 more
“Reminded me of ironcalc - rust based project that aims to have full excel parity.”
“IronCalc to the rescue?”
Caveats and dissent
No one in these comments warned against it.
Often compared with
From the makers not counted in the ranking
“working on an open source spreadsheet engine called IronCalc”
“I am working on IronCalc[1]. A spreadsheet engine.”
“We will start working on it by July according to the plan.”
First we got a grant from the NLnet[1], which I highly recommend as a first step of any project. Single best thing I could have done. That wasn't enough money for me to quit my job. Also I didn't have any _evidence_ that IronCalc was a good idea or that there was a market for it. Then evidence started pouring and I kept working. I started talking to different folks, lots of people many of those were contacts through
“I just jumped full time on IronCalc[1] a fully open source, light and fast spreadsheet engine”
“We have IronCalc[1].”
Threads where it came up
- The EU Open Source Strategy 3 mentions
- Ask HN: What Are You Working On? (March 2026) 3 mentions
- Understanding Financial Functions in Excel 2 mentions
- Rust Style Guide 1 mention
- Ask HN: What are you working on? (August 2026) 1 mention
- Show HN: Extend UI – open-source UI kit for modern document apps 1 mention
Data: ironcalc.json. Quotes are verbatim; the verdict and theme labels are written by a model from these comments, and every clause links to its sources.
All comments 8
“IronCalc looks better than LO Calc performance wise”
“We wrote (should say are writing) our own xlsx parser in Rust on IronCalc”
“And the project looks interesting and worthy to me.”
Is it really a counter example? "Gathering 12 partners for at least 3 years, towards a suite composed of 16 apps!" Read the About page and tell me what is it exactly that you will be paying for? https://nextgraph.org/introduction/ I mean we all agree of how good are the values posted on these page, but what are we paying for? Oh I see: https://nextgraph.org/roadmap/ This is the new roadmap for 2025, established thank
“eg.. https://www.ironcalc.com/”
“Reminded me of ironcalc - rust based project that aims to have full excel parity.”
“IronCalc to the rescue?”
“This is my implementation:”