I log some of the sent data (only under anonymous identifiers which can be reset by reinstalling the app, and without any location data) in order to know how many users I have, to be able to debug situations when a single user would generate too many requests, and to be able to improve the service (eg. by logging request latency).
However, I do not log any personally identifiable information (especially your location or IP address), except for the e-mail address, and I only log e-mail address if you voluntarily provide it in app settings.
The only third parties involved are
I further protect user data from third parties by not sending any personally identifiable information which could help link subsequent request to a same user. This specifically means that weather providers cannot track your location.
No third party analytics is used.
Subscriptions will be charged to your credit card through your iTunes account.
You can easily manage or cancel the subscription in App Store app → Account → Subscriptions on your watch or phone — just please cancel it at least 24 hours before the end of current period.
If you cancel the subscription, you will not be refunded for the current period, and you can of course use all Pro features during that time.
Your use of Weathergraph for Apple devices is managed by Apple's standard Licensed application end user license agreement.