I think generally the market for productive apps not geared towards enterprise has moved towards free (to try/start anyway) as the baseline assumption, with either an explicit pricing link or recognizable subscription implications (edit: or obvious app store links, natch). If anything explicit “for free” wording is a warning sign to me that something about the revenue model might be deceptive.

As far as mobile, I’d be happy to sling a few CSS suggestions your way for what stood out to me on first visit if you want!