[snthpy]

Awesome project! Looking forward to following this.

I've been looking out for projects like this over the years and I'm glad to see that this one takes Excel compatibility seriously! Also love the choice of Rust and WASM!

For me Dynamic Array support is a blocker and I can't play with it until you've got that. Very glad to see that's your top priority though[1]! That and everything in the Logical, Lookup and Reference, and Information sections (in that order). That covers probably over 95% of my work and I spend most of my time in Excel.

1: https://docs.ironcalc.com/

[snthpy]

What would be quite cool would be a small utility that one can run over ones workooks and that produces a csv or json file of all the Excel functions used and their count.

People could submit those and you'd get real usage stats of what functions people actually use in real world workbooks rather than guessing.

Users could also then use this to run a compatibility check to see if they could move over to your engine or not.

[nhatcher]

Hi snthpy, that is planed! We used to have that, but I removed it to simplify the UI.

If you don't mind compiling yourself there is a somewhat rough tool tat does that:

https://github.com/ironcalc/IronCalc/blob/main/xlsx/src/bin/...

It will tell you exactly what cells evaluate differently.

I will also add mentions to unsupported formulas and features

[nhatcher]

Thanks! Yes, that is exactly the top priority of the project right now.