Business Calendar 2 vs FairEmail

Developer provides prompt and understanding support with problems raised/questions asked.

Allows you to manage multiple calendars and multiple task (Google) accounts with ease.

Allows you to customise the look/feel of the widget, even after it has been created. Show different calendar/task accounts per widget.

Every 2 weeks, then edit four weeks in for 'This and following instances' etc., perfect with Google Calendar.

Multiple identities per account, notifications per account or contact.

It is actively maintained. The used libraries are up to date and bugs are fixed quickly.

There are no trackers within the app and trackers sent with mails are disabled by default. This app lets you read and compose emails with your privacy in your very own hands.

Privacy features are excellent.

~ 20 MB.

Supports both OpenPGP and S/MIME encryption for total privacy.

Allows to configure maximum size of email downloaded immediately.

Some HTML mails may show different links and link texts, this app however will show you the real link before opening, protecting against phishing and scams

Some domain names may use non-ASCII characters looking similar to the latin alphabet (e.g. some cyrillic characters). This app will show you the punycode representation of the domain, if that is the case and thus protect you against phishing and scams.

Some HTML mails may include ressources that can track you. This app doesn't load them by default, but reformats the text, increasing both privacy and readability.

There are open standards for any email provider to show how an email client should connect to the server. This app supports both RFC 6186 as well as Thunderbird Autoconfiguration standards.

Supports authenticating with the mail server using OAuth, thus increasing security.