the BEST

Youre too broke to pay for Billings, yet have the time to whine about an app which:

1.Supports all new Mac & iOS, usually weeks or months before the OS is public;
and
2.Supported  Watch OS before most devs could tie their shoes w/ WatchOS SDK; and
3.Has permanently taken the pain out of billing any time, any place for me and let my little company grow to 475 clients with no more than an intern;
then Billings performance on their devices should be the least of your concerns.

NerdsLimited about Billings Pro: Time & Invoice