You use different accounts but can make a group and add as many users as you want. It supports any language for entering items and costs but I’m not sure about user interface languages.
Messing around with envelopes? Can you elaborate?
You don’t have to follow the envelope system to the dot. Just create a couple of “envelope” to track where you are spending your money. Don’t have to “Re-fill” the envelopes…
I suggest to use Google Forms to automatically fill the sheet, unless you want to see the previous entries at all times.
Should have better usability on mobile.
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