There is an open source spreadsheet https://app.ironcalc.com/ if someone wants to package it.
Source code is at GitHub - ironcalc/IronCalc: Main engine of the IronCalc ecosystem
It has some API to compare states, but I don’t see how to turn changes into updates, so maybe it is not going to work for collaborative editing.
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That’s a nice idea.
I noticed with the “Editor” app that the “export” feature just copies the text to the chat, though I expected it would export to a text file on the device.
It would be nice to have the option of exporting to a text file on the device.