Alternatives and competitors
Sites like Mozilla Thunderbird
The 20 closest email client software alternatives to Mozilla Thunderbird, ranked by what they actually offer, and the 10 technologies behind it.
Looking for an alternative to Mozilla Thunderbird? The closest matches are Mozilla, Firefox and Fastmail. We match sites by what they actually offer, from their homepages, Wikidata and a summary by Claude, in any language. Vote on each alternative and leave a short note to help the next person choose.
- Neighbours
- k = 20
- Sites searched
- 4,032
- Vector
- 384-d
- Query
- 19 ms
01 · Entity
About Mozilla Thunderbird
Mozilla Thunderbird thunderbird.net
Wikidata: free email client and personal information manager
Summary by Claude
Official site of Mozilla Thunderbird, a free and open-source email client with calendar, contacts, RSS reader, chat and newsgroup support, available for Windows, macOS, Linux and Android.
- Who it’s for
- Desktop and mobile email users, individuals and organizations
- Business model
- Donations
02 · Embedding space
Competitor map
Each alternative by how close its vector is to Mozilla Thunderbird’s (x) and how much traffic it gets, how much of the stack it shares, or where it sits in the embedding space itself (y). Lines split each axis at the median. Hover for the numbers, click to jump to it in the list.
similarity × popularity
03 · Nearest neighbours
Alternatives to Mozilla Thunderbird
Thumbs up if it’s a real alternative to Mozilla Thunderbird, thumbs down if it isn’t.
We can’t read thunderbird.net’s homepage (bot protection page), so it’s compared on what Wikidata and Wikipedia say about it.
- 01
Mozilla - Internet for people, not profit (US)
We’re working to put control of the internet back in the hands of the people using it.
Very close cos 0.921 - 02
Firefox: The fast, private browser that keeps you safe — Firefox.com
The independent browser that has your back. Firefox blocks trackers, has a free built-in VPN, puts you in control of AI, and never sells your personal data.
Close cos 0.888 - 03
Email and calendar made better | Fastmail
Fast, private email hosting for you or your business. More productive, lightning fast, simple and built to save you time.
Close cos 0.887 - 04
NetBird - Open Source Zero Trust Networking
WireGuard®-based overlay network and Zero Trust Network Access in one platform for reliable and secure connectivity
Close cos 0.875 - 05
Free email accounts | Register today at mail.com
Email how it is supposed to be: ✔ Free, simple and secure ✔ Manage multiple mail accounts in one place, from any device ✔ Sign up today!
Close cos 0.872 - 06
Create Email Marketing Your Audience Will Love - MailerLite
Digital marketing tools to grow your audience faster and drive revenue smarter. Backed by 24/7 award-winning support. Check it out now!
Close cos 0.868 - 07
RustDesk: Open-Source Remote Desktop with Self-Hosted Server Solutions
RustDesk is open-source remote desktop software for your own self-hosted server, a TeamViewer and AnyDesk alternative for Windows, macOS, Linux and Android.
Close cos 0.867 - 08
Doxygen homepage
Source code documentation and analysis tool
Close cos 0.866 - 09
Email & SMS Marketing Platform | Mailchimp
Utilize real-time user behavior data and artificial intelligence to convert more customers. Easy to use, get started for free!
Close cos 0.865 - 10
Client Challenge
American hosting service, owned by Scribd, for professional content including presentations, infographics, documents, and videos
Close cos 0.867 - 11
Client Challenge
free and open-source web content management system
Close cos 0.867 - 12
Tuta: Turn ON privacy for free with secure emails, calendars & contacts | Tuta
Tuta guarantees your data stays private for free & without ads. Quantum-resistant encryption makes Tuta the best secure technology solution to protect your privacy.
Close cos 0.863 - 13
Ghost: The best open source blog & newsletter platform
Beautiful, modern publishing with email newsletters and paid subscriptions built-in. Used by Platformer, 404Media, Lever News, Tangle, The Browser, and thousands more.
Close cos 0.864 - 14
The Linux Kernel Archives
Unix-like operating system kernel, basis for all Linux operating systems
Close cos 0.866 - 15
Outlook
former brand name for Microsoft online services
Close cos 0.863 - 16
Zotero | Your personal research assistant
Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.
Close cos 0.865 - 17
nginx
open source web server and a reverse proxy server
Close cos 0.864 - 18
GMX - kostenlose E-Mail, Cloud, Nachrichten & Freemail
Kostenlose E-Mail-Adresse erstellen, Nachrichten lesen und Fotos & Dateien in der GMX Cloud sicher speichern. Jetzt registrieren!
Close cos 0.867 - 19
FileZilla - The free FTP solution
FileZilla - The free FTP solution for both client and server. Filezilla is open source software distributed free of charge.
Close cos 0.862 - 20
MariaDB Foundation - MariaDB.org
database management system, relational, open source, community developed fork of MySQL
Close cos 0.862
Ranked by score: the cosine similarity of each site’s vector to thunderbird.net’s, less a small penalty for generic sites that are close to everything. Highlighted technologies are ones Mozilla Thunderbird uses too. Votes and comments come from visitors and don’t change the ranking.
04 · Fingerprints
Technology
What Mozilla Thunderbird is built with, and what its closest competitors use, from its homepage’s code and its DNS records.
Built with
- Marketing automation
- Mailchimp TXT v=spf1 include:%{i}._ip.%{h}._ehlo.%{d}._spf.vali.email include:spf.m…
- Live chat & support
- Zendesk TXT v=spf1 include:%{i}._ip.%{h}._ehlo.%{d}._spf.vali.email include:spf.m…
- CDN
- Cloudflare header cf-ray: a5631b876d5721ff-HAM
- Email hosting
- Google Workspace MX aspmx.l.google.com
- Microsoft 365 TXT MS=ms81336502
- DNS hosting
- Cloudflare DNS NS nick.ns.cloudflare.com
- SaaS tools (verified in DNS)
- Apple Business TXT apple-domain-verification=pzjYlsoA8s7Ha71Q
- Atlassian TXT atlassian-domain-verification=8xkMty0tOT0eog0PN17DvoBgD4NC/3/j/Tkx6tR…
- Google Search Console TXT google-site-verification=96iXS_8P8qP6DhVQz3lTKDZqKDpvv2TIzJfiFmVBGXc
- Notion TXT notion-domain-verification=CTJ2GxP5qpUZsOatCxmocIYuUHiXe1V8HTyXcPbZVyG
Stack changes
No changes yet. Each new crawl is compared with the last one, and what Mozilla Thunderbird adds or drops shows up here.
What competitors use
Across the 20 closest sites.
- Google Search Console 16/20
- Google Workspace 9/20
- Microsoft 365 7/20
- Meta Business Suite · not on thunderbird.net 6/20
- Cloudflare DNS 5/20
- Fastly · not on thunderbird.net 4/20
- Amazon SES · not on thunderbird.net 4/20
- Cloudflare 4/20
- Amazon Route 53 · not on thunderbird.net 4/20
- nginx · not on thunderbird.net 4/20
- Akamai Edge DNS · not on thunderbird.net 3/20
- Google Cloud · not on thunderbird.net 3/20
- Apache HTTP Server · not on thunderbird.net 3/20
- Sentry · not on thunderbird.net 2/20
- Zoom · not on thunderbird.net 2/20
- Brevo · not on thunderbird.net 2/20