What is Mozilla Thunderbird?
Thunderbird consolidates email, calendars, and contacts from multiple accounts into one interface. It runs on Windows, Mac, and Linux, is funded by user donations, and prioritizes privacy by never collecting personal data or serving advertisements.
Mozilla Thunderbird pricing
We don't have Mozilla Thunderbird's full plan breakdown yet (its pricing page resisted automated reading). Here's what we could confirm. Always check live pricing for exact numbers.
Free, open-source. Free forever.
What Mozilla Thunderbird does
The capabilities that matter for email clients, normalised so it lines up with every alternative. “-” means we haven't confirmed it, not that it's missing.
- Deployment model
- Local direct imap client
- Universal imap smtp exchange support
- ✓
- Keyboard shortcut only navigation speed
- -
- Split inbox AI auto categorization
- -
- Read receipts and open tracking
- -
- Snooze and scheduled send later
- -
- Generative AI LLM email drafting
- ✗
- Conversational chat layout view
- -
- Unified multi account inbox view
- ✓
- Pgp end to end encryption support
- -
- SOC2 type ii
- -
- ISO 27001
- -
- Pricing model
- Free open source
Platform & deployment
Independently observed- macOS
- Linux
- Windows
Security & compliance
Known vulnerabilities: 0 (0 in the last 12 months) sourcea count reflects scale & disclosure, not quality
Mozilla Thunderbird FAQ
Common questions about Mozilla Thunderbird, answered from independent, dated evidence.
What is Mozilla Thunderbird?
Thunderbird consolidates email, calendars, and contacts from multiple accounts into one interface. It runs on Windows, Mac, and Linux, is funded by user donations, and prioritizes privacy by never collecting personal data or serving advertisements. It is indexed under Email Clients.
Source: https://www.thunderbird.net
Is Mozilla Thunderbird free?
Mozilla Thunderbird offers a free tier, so you can start without paying. Pricing changes often, so verify at source before relying on it.
Source: https://www.thunderbird.net
What platforms does Mozilla Thunderbird support?
Mozilla Thunderbird supports Windows, macOS and Linux. Platforms we have not confirmed are simply not listed here rather than ruled out.
Source: https://www.thunderbird.net
Is Mozilla Thunderbird open source?
Yes. Mozilla Thunderbird is published under the Apache-2.0 licence, a permissive licence that generally allows commercial use and modification. Licence terms can change between releases, so verify against the repository for the version you intend to use.
Mozilla Thunderbird alternatives
Other email clients we track, ranked by the same independent score.
- Proton MailEmail service with end-to-end encryption that protects privacy by preventing message scanning and advertising usemedium · 72%
- SuperhumanAn integrated suite combining email, writing assistance, document collaboration, and AI agents that work across your existing applicationsmedium · 73%
- Canary MailAn email client that adds end-to-end encryption, phishing protection, and tracker blocking to your existing email accountshigh · 75%
- SpikeUnified email and messaging platform for team collaborationlow · 49%
- MailspringAn open-source, lightweight email application for Windows, Mac, and Linux with a focus on efficiency and local processingmedium · 65%
- MimestreammacOS email application for managing multiple Google accounts across devicesmedium · 54%
Compare Mozilla Thunderbird
Side by side against other email clients, attribute by attribute, with a source on every value.
The vioscaleAI score: one lens on the evidence
Not user reviews and not a paid placement: a confidence-weighted blend of the independent signals below (adoption, activity, security posture, and more), which you can sort and re-weight yourself. Vendors can correct their listing but can never move their rank, and stars are weighted low as a vanity metric. It is one way to read the evidence for Mozilla Thunderbird, not the verdict.
| Signal | Score | Weight | Contribution | Evidence |
|---|---|---|---|---|
| Development activity | 63 | 0.09 | 5.9 | ✓ |
| Capabilities | 46 | 0.07 | 3.2 | ✓ |
| Security score | 72 | 0.04 | 3.0 | ✓ |
| Stars | 78 | 0.03 | 2.0 | ✓ |
| Integrations | 0 | 0.08 | 0.0 | - |
| Dependent projects | 0 | 0.06 | 0.0 | ✓ |
| Release cadence | 0 | 0.05 | 0.0 | - |
| Security posture | 0 | 0.06 | 0.0 | - |
| Package downloads | 0 | 0.14 | 0.0 | - |
| Developer Q&A activity | 0 | 0.06 | 0.0 | - |
Computed . Re-weight it by intent, or see the full method.
All data & sourcesshow ↓
Every value we hold, with its source, retrieval date, and confidence. This is the evidence behind the score: don't trust it, verify it.
Activity
| Attribute | Value | Evidence |
|---|---|---|
| Commits last 30d | 100 | mediumsource · 2026-10-14 · 65% |
Adoption
Content
| Attribute | Value | Evidence |
|---|---|---|
| Faq | 4 items | mediumsource · 2026-09-10 · 69% |
Features
| Attribute | Value | Evidence |
|---|---|---|
| Capabilities | Pricing model: free_open_source · Deployment model: local_direct_imap_client · Generative ai llm email drafting: No · Unified multi account inbox view: Yes · Universal imap smtp exchange support: Yes | mediumsource · 2026-08-21 · 60% |
Language
| Attribute | Value | Evidence |
|---|---|---|
| Primary | Kotlin | highsource · 2026-10-14 · 90% |
License
| Attribute | Value | Evidence |
|---|---|---|
| Spdx | Apache-2.0 | highsource · 2026-10-14 · 95% |
Pricing
Release
| Attribute | Value | Evidence |
|---|---|---|
| History | 20 items | mediumsource · 2026-10-14 · 70% |
Security
Is Mozilla Thunderbird the right choice for you?
Tell us the job, the constraints and what you weigh most, and we will rank Mozilla Thunderbird against the rest of the email clients we index, using the same dated evidence weighted your way.
Free to run, no account needed to start. How the evaluation works
Is this your product?
This profile was built from public sources without asking you. You can take the badge below and use it anywhere, and you can claim the profile to correct anything we got wrong. Both are free, and neither moves Mozilla Thunderbird up or down: nobody can buy rank here, including you.
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