Cross-platform email client supporting multiple identities, chat, and strong filtering. Extend functionality with add-ons like RSS/Atom feed readers and PGP support.
Cost / License
- Free
- Open Source
Application types
Platforms
- Mac
- Windows
- Linux
- Android
- BSD
- AppImageHub
- Snapcraft
- Flathub
- PortableApps.com
- F-Droid
- Haiku
- Homebrew
- Chocolatey




Comments about Thunderbird as an Alternative to Spark Mail
works like an old email client, downloading the message and saving in folders. It doesn't work syncing directly online with gmail labels.
Security & Privacy of Spark is questionable: "Data storage and encryption is secured through Google Cloud service." Thunderbird supports OpenPGP & S/MIME email encryption and is still completely free.
Some users think Thunderbird is a great Spark Mail alternative, some don't.
Thunderbird is the most popular Windows, Android, Mac & Linux alternative to Spark Mail.
Thunderbird is the most popular Open Source & free alternative to Spark Mail.
- Thunderbird is Free and Open Source
- Thunderbird is Customizable and Privacy focused


















































There is NO Spark Version for Windows. That's why Thunderbird is the Best Alternative IMO.