# Mimestream vs Mozilla Thunderbird

**Leader by vioscaleAI score:** Mimestream

| Attribute | Mimestream | Mozilla Thunderbird |
|---|---|---|
| **vioscaleAI score** | 54.4 (54% (medium)) | 48.7 (44% (low)) |
| activity.commits_last_30d | - | 100 |
| adoption.dependent_repos | - | 0 |
| adoption.github_stars | - | 14,107 |
| content.faq | `[{"answer":"A subscription-based email client for Mac that supports multiple Google accounts with family sharing and access across up to five devices. Requires an active subscription after the free trial period. It is indexed under Email Clients.","source":"https://mimestream.com/pricing","question":"What is Mimestream?","confidence":0.6},{"answer":"Mimestream is a paid product; published pricing starts at $4.99 per month. It is sold across 2 plans (Individual and Group). There is no free tier. Prices are published openly on the vendor's own pricing page. Pricing changes often, so verify at source before relying on it.","source":"https://mimestream.com/pricing","question":"How much does Mimestream cost?","confidence":0.6},{"answer":"Mimestream supports macOS. Platforms we have not confirmed are simply not listed here rather than ruled out.","source":"https://mimestream.com/pricing","question":"What platforms does Mimestream support?","confidence":0.6},{"answer":"We have only confirmed a cloud / SaaS deployment for Mimestream, so it appears to be vendor-hosted. If a self-hosted option exists we have not found it documented publicly.","source":"https://mimestream.com/pricing","question":"Can Mimestream be self-hosted?","confidence":0.6},{"answer":"We have confirmed 3 integrations for Mimestream, including Gmail API, Google Calendar and Apple Calendar. This is what we could verify from public sources, so the vendor may support others we have not indexed.","source":"https://mimestream.com/pricing","question":"What does Mimestream integrate with?","confidence":0.6},{"answer":"Mimestream is available worldwide. Its primary market is the United States.","source":"https://mimestream.com/pricing","question":"Where is Mimestream available?","confidence":0.5}]` | `[{"answer":"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","question":"What is Mozilla Thunderbird?","confidence":0.6},{"answer":"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","question":"Is Mozilla Thunderbird free?","confidence":0.6},{"answer":"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","question":"What platforms does Mozilla Thunderbird support?","confidence":0.6},{"answer":"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.","source":"https://github.com/thunderbird/thunderbird-android","question":"Is Mozilla Thunderbird open source?","confidence":0.95}]` |
| deployment.options | `{"cloud":true}` | - |
| description.long | A subscription-based email client for Mac that supports multiple Google accounts with family sharing and access across up to five devices. Requires an active subscription after the free trial period. | 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. |
| features.capabilities | `{"pricing_model":"premium_flat_subscription","unified_multi_account_inbox_view":true}` | `{"pricing_model":"free_open_source","deployment_model":"local_direct_imap_client","generative_ai_llm_email_drafting":false,"unified_multi_account_inbox_view":true,"universal_imap_smtp_exchange_support":true}` |
| integrations.count | 3 | - |
| integrations.list | `[{"name":"Gmail API"},{"name":"Google Calendar"},{"name":"Apple Calendar"},{"name":"Google","native":true,"category":"email","direction":"bidirectional"}]` | - |
| language.primary | - | Kotlin |
| license.spdx | - | Apache-2.0 |
| market.availability | `{"primaryMarkets":["US"],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` | - |
| platform.support | `{"mac":true}` | `{"mac":true,"linux":true,"windows":true}` |
| pricing | `{"type":"subscription","plans":[{"free":false,"name":"Individual","summary":"$4.99/month or $49.99/year","features":["All your Google accounts","Use on up to 5 devices","Share with immediate family"],"components":[{"kind":"fixed","amount":4.99,"period":"month","currency":"USD"},{"kind":"fixed","amount":49.99,"period":"year","currency":"USD"}],"description":"Everything you need for individual use. Includes free family sharing.","contactSales":false,"includedLimits":{"devices":"5"}},{"free":false,"name":"Group","summary":"$4.99/seat/month or $49.99/seat/year","features":["All your Google accounts","Use on up to 5 devices","Share with immediate family","Centralized billing","Easy seat management"],"components":[{"kind":"per_unit","unit":"seat","amount":4.99,"period":"month","currency":"USD"},{"kind":"per_unit","unit":"seat","amount":49.99,"period":"year","currency":"USD"}],"description":"For teams and organizations.","contactSales":false}],"summary":"From $4.99/month or $49.99/year. 14-day free trial without credit card.","currency":"USD","freeTier":false,"sourceUrl":"https://mimestream.com/pricing","retrievedAt":"2026-09-06T13:50:38.119Z","freeTrialDays":14,"startingPrice":{"amount":4.99,"period":"month","currency":"USD"},"billingPeriods":["month","year"]}` | `{"type":"free","summary":"Free, open-source. Free forever.","freeTier":true,"sourceUrl":"https://www.thunderbird.net","retrievedAt":"2026-08-21T12:42:28.376Z"}` |
| pricing.free_tier | no | yes |
| pricing.model | commercial | freemium |
| pricing.price_level | low | free |
| pricing.starting_price | `{"amount":4.99,"currency":"USD"}` | - |
| pricing.transparent | yes | yes |
| release.history | - | `[{"url":"https://github.com/thunderbird/thunderbird-android/releases/tag/THUNDERBIRD_24_0","date":"2026-10-05T23:38:09Z","type":"stable","version":"THUNDERBIRD_24_0"},{"url":"https://github.com/thunderbird/thunderbird-android/releases/tag/K9MAIL_24_0","date":"2026-10-05T23:38:15Z","type":"stable","version":"K9MAIL_24_0"},{"url":"https://github.com/thunderbird/thunderbird-android/releases/tag/THUNDERBIRD_25_0b1","date":"2026-10-05T23:36:57Z","type":"prerelease","version":"THUNDERBIRD_25_0b1"},{"url":"https://github.com/thunderbird/thunderbird-android/releases/tag/THUNDERBIRD_23_1","date":"2026-09-22T05:59:49Z","type":"stable","version":"THUNDERBIRD_23_1"},{"url":"https://github.com/thunderbird/thunderbird-android/releases/tag/K9MAIL_23_1","date":"2026-09-22T05:59:50Z","type":"stable","version":"K9MAIL_23_1"},{"url":"https://github.com/thunderbird/thunderbird-android/releases/tag/THUNDERBIRD_24_0b2","date":"2026-09-14T18:09:35Z","type":"prerelease","version":"THUNDERBIRD_24_0b2"},{"url":"https://github.com/thunderbird/thunderbird-android/releases/tag/THUNDERBIRD_23_0","date":"2026-09-09T06:41:45Z","type":"stable","version":"THUNDERBIRD_23_0"},{"url":"https://github.com/thunderbird/thunderbird-android/releases/tag/K9MAIL_23_0","date":"2026-09-09T06:41:39Z","type":"stable","version":"K9MAIL_23_0"},{"url":"https://github.com/thunderbird/thunderbird-android/releases/tag/THUNDERBIRD_24_0b1","date":"2026-09-08T22:28:10Z","type":"prerelease","version":"THUNDERBIRD_24_0b1"},{"url":"https://github.com/thunderbird/thunderbird-android/releases/tag/THUNDERBIRD_22_0","date":"2026-08-11T03:59:18Z","type":"stable","version":"THUNDERBIRD_22_0"},{"url":"https://github.com/thunderbird/thunderbird-android/releases/tag/K9MAIL_22_0","date":"2026-08-11T03:59:18Z","type":"stable","version":"K9MAIL_22_0"},{"url":"https://github.com/thunderbird/thunderbird-android/releases/tag/THUNDERBIRD_23_0b1","date":"2026-08-10T22:13:14Z","type":"prerelease","version":"THUNDERBIRD_23_0b1"},{"url":"https://github.com/thunderbird/thunderbird-android/releases/tag/THUNDERBIRD_21_1","date":"2026-08-03T19:14:04Z","type":"stable","version":"THUNDERBIRD_21_1"},{"url":"https://github.com/thunderbird/thunderbird-android/releases/tag/K9MAIL_21_1","date":"2026-08-03T19:14:10Z","type":"stable","version":"K9MAIL_21_1"},{"url":"https://github.com/thunderbird/thunderbird-android/releases/tag/THUNDERBIRD_22_0b2","date":"2026-07-27T20:45:48Z","type":"prerelease","version":"THUNDERBIRD_22_0b2"},{"url":"https://github.com/thunderbird/thunderbird-android/releases/tag/THUNDERBIRD_21_0","date":"2026-07-20T21:30:00Z","type":"stable","version":"THUNDERBIRD_21_0"},{"url":"https://github.com/thunderbird/thunderbird-android/releases/tag/K9MAIL_21_0","date":"2026-07-20T21:29:55Z","type":"stable","version":"K9MAIL_21_0"},{"url":"https://github.com/thunderbird/thunderbird-android/releases/tag/THUNDERBIRD_22_0b1","date":"2026-07-20T23:20:30Z","type":"prerelease","version":"THUNDERBIRD_22_0b1"},{"url":"https://github.com/thunderbird/thunderbird-android/releases/tag/THUNDERBIRD_20_1","date":"2026-07-06T22:30:54Z","type":"stable","version":"THUNDERBIRD_20_1"},{"url":"https://github.com/thunderbird/thunderbird-android/releases/tag/K9MAIL_20_1","date":"2026-07-06T22:30:53Z","type":"stable","version":"K9MAIL_20_1"}]` |
| security.scorecard | - | 7.2 |
| security.vulnerabilities | - | `{"count":0,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=fdroid&package_name=com.fsck.k9&per_page=100","last_12m":0,"max_severity":null}` |

## Capabilities (Email Clients)

| Capability | Mimestream | Mozilla Thunderbird |
|---|:--:|:--:|
| **Capabilities** |  |  |
| 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 | Premium flat subscription | Free open source |

*Source: vioscaleAI. Generated 2026-10-16T20:50:59.258Z. "-" = undocumented, not absent.*