- only web app
- needs client app
What's up with that misleading information as if there's something missing? This just means you can use any mail application you want with the standard mail protocols IMAP and POP3. If a mail provider is offering an app themselves that's fine but that's nothing a mail provider HAS to offer. What's much more important is how they handle you data, how good they filter out spam, how big you mailbox can be, cost, sustainability etc. But the app is the least important thing.