The short answer
“Alternative to Office 365” has three realistic answers, but for most people it comes down to one. If you are used to Word, Excel and Outlook and do not need to be tied to the cloud, the perpetual Office licence is the most economical choice: pay once instead of every year. Google Workspace is worth it above all for genuine team collaboration in the cloud. LibreOffice is free, but it costs you an adjustment period and layout risk when exchanging files.
Work it out for yourself: the calculator shows what each option costs over the years. The detailed comparison follows below.



