The only difference is that Pro version doesn't have any ads. All functionality is the same.
If you already have a Free version installed and want to get rid of ads, no need to install Pro version. Use "Upgrade" button in the navigation menu to remove the ads just for $2.
Not yet, but I'm working on a web version. I hope to finish it by the end of 2021. Please send me a note to email@example.com if you would like to participate in beta.
Sorry, didn't have time to create an iOS version. Maybe in the future... Also, hopefully the web version (see the question above) will be almost as good as Android version.
Thank you! I really appreciate it.
You can donate using this magic button (uses PayPal, beware of potentially high fees):
Or Bitcoin: bc1q2l754ljqaytmn6xxec0n78na00mpp5tx5tzajl