About
Thunderbird provides a free, open-source email, calendar, and contacts application for desktop (Windows, Linux, macOS) and mobile (Android). Its core mission is to free users from inbox chaos and manipulation by offering a private, secure, and customizable productivity tool. Thunderbird is funded by user donations and is committed to user privacy and security.
Key facts
At-a-glance profile data
- Website
- thunderbird.net
- Founded
- 2003
- Employees
- 48
- Total funding
- -
- Business model
- B2C
Tech stack
Detected on thunderbird.net, last scanned 5 Aug 2026. Run your own scan
- CDN
- Cloudflare
- Email provider
- Google Workspace
“What are the differences between Thunderbird and K-9 Mail nowadays?”
View on Reddit“Hiya, i've been trying to replace my webmail with Thunderbird for a few days now and unfortunately i have some negative feedback :( I'm a Linux user, using 151 via Flatpak. The stuff i'm not liking: No minimise to tray. This is surprising f…”
View on Reddit“Although I always use Thunderbird again, I end up returning to emClient in less than a day. Reflection: Thunderbird seems to have stopped in time about 10 years ago. I am a financial donor and I trust the project, but I feel that it is not…”
View on Reddit“Is thunderbird still safe in 2026?. Is their privacy, data collection etc… still good at this time?”
View on Reddit“I missed a very important meeting last week because Thunderbird had silently disabled my calendar. This could be due to this , or any other related ticket . In some cases Thunderbird will decide to disable your calendar, and you are not not…”
View on RedditSome comments are pulled from public discussions around the web (look for the source icon). Quotes are excerpts; click through to read the full thread.
Frequently asked
How many employees does Thunderbird have?
Thunderbird has approximately 48 people on record.