Comment by alberth

You know what also have huge app sizes, it's various iOS email app. Fastmail is the only email/calendar app with a reasonable size (just 20MB) [0].

- Gmail (397MB) [1]

- Outlook (328MB) [2]

- Hey (69MB) [3]

- Protonmail (128MB) [4]

[0] https://apps.apple.com/us/app/fastmail-email-calendar/id9313...

[1] https://apps.apple.com/us/app/gmail-email-by-google/id422689...

[2] https://apps.apple.com/us/app/microsoft-outlook/id951937596

[3] https://apps.apple.com/us/app/hey-email/id1506603805

[4] https://apps.apple.com/us/app/protonmail-encrypted-email/id9...