No. All of your events, reminders, and contacts are synced from your calendar and contacts services (such as iCloud, Google, or Exchange) and stored on your device. Your personal data is never sent to Flexibits or anyone else.
Fantastical and Cardhop use your username and password to sync and display your events, reminders, and contacts. Your username and password are stored securely in the Keychain. The Keychain is part of macOS and iOS and is responsible for securely storing usernames and passwords. Your account information is never used for any reason other than to sync your data, and your account information never leaves your device.
Fantastical for Mac:
Fantastical for iPhone and Fantastical for iPad:
Cardhop for Mac:
Cardhop for iOS:
Please contact us and we'll get back to you.