Pattern Keeper costs around 9 US dollars, as a one time charge.
The only limit to the trial is time. It already contains all features.
You can no longer open you charts but your data is kept safe!
Yes, if the devices use the same Google Play account you can use it without paying again.
No, not yet
No, but you can use an Android emulator like Bluestacks
You need an Android tablet/phone that runs Android 4.1 or later.
A list of the currently supported designers
We love to hear your ideas and feedback. There is a public feature request list.