Terms

Plain version, because it is a small business talking to a small business.

14 days free. No card, and nothing is charged during them.
After that, $29 a month. Stop any time and the next payment does not happen.
No refunds. The 14 free days are there so you know it is right for you before you pay anything.
Your figures are yours. Download all of them, any time, from Reports inside the app.
JTS does not sell them, share them, or use them to build anything other people can see.
It does the arithmetic on the figures you give it, with the working shown. It is not tax, legal or accounting advice: the tax set-aside is your percentage, and what you spend is your call.

The rest of the JTS tools

One trade each, and the same idea every time: one number you have never had, worked out from what you already know.