So I'm not sure if it's because of problems from the host of the CryptPad instance or because of CryptPad itself, but I've been using CryptPad for a collaborative spreadsheet for a weeks now, and it's been absolutely awful

- Lost modifications, a lot of times ("something went wrong, please reload" and then the last 15 minutes of changes are just GONE)

- Very frequent "synchronizing... please wait" screens that block you from doing anything for a few seconds

- Undo/redo not possible in "live editing mode"

- In "non-live editing mode", if you don't hit save manually and the TCP connection resets, you will lose all your changes

- Pivot tables do very weird things with formatting

And that's the experience of a solo user, there wasn't anyone joined in on the document at the time. I can only imagine how it would have been if were multiple persons working on that spreadsheet.

I do have a flaky Internet connection, but Google Docs handle it fine, and emacs-crdt works very well too.

I'm now refactoring the whole spreadsheet into a bunch of .csv files stored in Git, and a Python script that outputs a pivot table, because I've lost more types due to CryptPad bugs than the time it would take me to write that script.