Free - what's the catch? I don't want to have the same problem all over again. Forget the fine print, the body text is really hard to read superthin gray text on white.
We make revenue from products that help companies with advertising and competitive research. Our push service helps us collect the data necessary to make this work, similar to services like Flurry Analytics. So we're happy to provide it for free. Happy to go into more detail via email: contact@onesignal.com