BlueMail vs GNUMail

BlueMail

8.7 #16 in Email clients

4.8 #142 in Email clients

	BlueMail	GNUMail
Platforms	Windows, macOS, Linux, iOS, Android	macOS, Linux, Windows
Free plan	Yes	Yes
App coverage	all	desktop
Unified inbox	Yes
Offline access	Yes
Calendar tools	Yes

Listed together in Best Email Clients