I remember trying it out, yes. I yet need to do a serious comparative analysis.
For what I can see OnlyOffice is feature complete, it's a full office solution. The sheets component is way ahead from IronCalc.
On the plus side, IronCalc is way lighter. When you go to IronCalc you download < 1Mb (compressed), it is faster and able to load larger workbooks on the web. IronCalc is an engine, meaning you don't need a UI at all to run it.
I don't think IronCalc is an alternative today to OnlyOffice. At most one day might be an alternative to the sheets component.
For what I can see OnlyOffice is feature complete, it's a full office solution. The sheets component is way ahead from IronCalc.
On the plus side, IronCalc is way lighter. When you go to IronCalc you download < 1Mb (compressed), it is faster and able to load larger workbooks on the web. IronCalc is an engine, meaning you don't need a UI at all to run it.
I don't think IronCalc is an alternative today to OnlyOffice. At most one day might be an alternative to the sheets component.