Why This Page Exists Before the Product Pages
Every product review on this site would otherwise read as an open question. A free page might be crude but a paid bot could be better; a bot might be marketing but a group could have a contact inside. Once the argument above is settled, the reviews become descriptions of what each product costs you rather than debates about whether it works.
It also spares you the tests. There is no need to install nineteen apps to discover the same thing nineteen times, and every install carries a permission cost that the discovery does not repay.
The One Thing Worth Doing Anyway
Run the experiment once, on paper, with no money on it. A hundred logged calls against a hundred coin flips takes an evening and settles the question with your own data rather than ours — the method is set out in how to test any tool yourself. For the wider picture of what each category of product costs, start at the home page.