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Thunderbird

Open-source desktop email from Mozilla

Toolora score88Open source

Free / open source

Firefox

Independent browser from Mozilla

Toolora score88Free

Free

Proton

Encrypted email, calendar, VPN, and drive

Toolora score90Free

Free Mail

Spec	Thunderbird	Firefox	Proton
Category	Productivity	Productivity	Productivity
Pricing	Free / open source	Free	Free Mail + paid Proton Unlimited
Toolora score	88/100	88/100	90/100
Best for	email, desktop, open-source, mozilla	browser, privacy, mozilla, extensions	email, encryption, vpn, privacy
Top features	·IMAP and POP accounts ·Local mail archive ·Calendar and address book	·Desktop and mobile browsers ·Extensions ·Multi-account containers	·Encrypted email ·VPN and password extras ·Calendar and Drive