No, you don't need Excel (what an expensive bloatware!!)... offline, I personally use what's called LibreOffice (used to be OpenOffice).... which is a free, open-source alternative to MS Excel. For this, you just need to download in the OpenDocument format, and open the file with... should be recognized properly.
I don't have an iPad so not sure if this will work well, but I believe there is LibreOffice app for iPad. Another option is just to import the downloaded spreadsheet within your Google account (i.e., just copying).
I could also add people and give permissions to edit the documents I'm working on directly on Google. But I don't want someone to intentionally/accidentally erase the info, haha....

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