Nope : if you provide free apps you don't need to be a company. But in France, if you get more than 10% of your annual incomes you need to register at least as an "auto entrepreneur" and pay fees and taxes on your incomes. So if you plan to make "big money", you'll have to be a company.
Edit: if you make less than 10% of your incomes you will declare them as "extra profits" on your annual revenues