Biggest issue I've had with excel and spreadsheets in general has been "put this on the web". People spend hours/days/weeks building a spreadsheet tool that do

Biggest issue I've had with excel and spreadsheets in general has been "put this on the web". People spend hours/days/weeks building a spreadsheet tool that does all their calculations, then say "put this on the web" to me, and I can't do it. Not in their budget. To them, it should just be some sort of magic, but... I don't know of tools to just 'put' something like that on the web. They want people to be able to interact with it, but 'not download it'. They won't use Google spreadsheets or any office365 online stuff. Maybe there are some tools that can take an xlsx file and make it secure, interactive and loggable and are also free (or nearly so?) Am I missing something?