# Mozilla Thunderbird vs Spike

| Attribute | Mozilla Thunderbird | Spike |
|---|---|---|
| **Vioscale score** | 60.1 (27% (low)) | 73.1 (25% (low)) |
| activity.commits_last_30d | 100 | - |
| adoption.dependent_repos | 0 | - |
| adoption.github_stars | 13,921 | - |
| deployment.options | - | `{"cloud":true}` |
| description.long | 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. | A unified platform that consolidates email, team chat, shared documents, tasks, and video calling into a single collaborative interface with AI-powered features to boost productivity across all devices. |
| features.capabilities | `{"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 | - | 1 |
| integrations.list | - | `[{"name":"WhatsApp"}]` |
| language.primary | Kotlin | - |
| license.spdx | Apache-2.0 | - |
| market.availability | - | `{"hqCountry":"IL","primaryMarkets":[],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` |
| platform.support | `{"mac":true,"linux":true,"windows":true}` | `{"ios":true,"mac":true,"web":true,"android":true,"windows":true}` |
| pricing | `{"type":"free","summary":"Free, open-source. Free forever.","freeTier":true,"sourceUrl":"https://www.thunderbird.net","retrievedAt":"2026-08-21T12:42:28.376Z"}` | `{"type":"subscription","plans":[{"free":true,"name":"Starter","summary":"Free up to 3 members","features":["1 teamspace","Free @spike.team email address","60 days search history","Spike AI (10 queries)","Standard support"],"minSeats":3,"description":"For small teams","contactSales":false,"includedLimits":{"members":"3"}},{"free":false,"name":"Team","summary":"$4/seat/month billed annually","features":["Unlimited Spike AI","Free custom domain (yearly)","Unlimited search history","Broadcast channels","Shared inbox","External collaboration","WhatsApp integration"],"commitment":"annual","components":[{"kind":"per_unit","unit":"seat","amount":4,"period":"month","currency":"USD"}],"description":"For growing teams","contactSales":false},{"free":false,"name":"Business","summary":"$8/seat/month (launching soon)","features":["SAML-SSO","500 MB file uploads","VIP support"],"components":[{"kind":"per_unit","unit":"seat","amount":8,"period":"month","currency":"USD"}],"description":"For advanced teams & businesses","contactSales":false},{"free":true,"name":"Smart Inbox","summary":"Free personal email","features":["1 email address","60 days search history","Unified calendar"],"minSeats":1,"description":"Personal email plan","contactSales":false,"includedLimits":{"storage":"1 GB","file_upload":"30 MB"}},{"free":false,"name":"Pro","summary":"$6/month","features":["Voice messages","1-click unsubscribe","Guest collaborators"],"minSeats":1,"components":[{"kind":"fixed","amount":6,"period":"month","currency":"USD"}],"description":"Advanced personal email","contactSales":false,"includedLimits":{"storage":"5 GB","file_upload":"100 MB"}},{"free":false,"name":"Ultimate","summary":"$12/month","features":["All Pro features","20 GB storage","1 GB file uploads"],"minSeats":1,"components":[{"kind":"fixed","amount":12,"period":"month","currency":"USD"}],"description":"Unlimited personal email","contactSales":false,"includedLimits":{"storage":"20 GB","file_upload":"1 GB"}}],"summary":"Free tier available for up to 3 members. Team plans start at $4/seat/month (annual). Personal plans from $6/month.","currency":"USD","freeTier":true,"sourceUrl":"https://www.spikenow.com/pricing/","retrievedAt":"2026-08-19T09:05:46.843Z","startingPrice":{"amount":6,"period":"month","currency":"USD"},"billingPeriods":["month","year"]}` |
| pricing.free_tier | yes | yes |
| pricing.model | freemium | freemium |
| pricing.price_level | free | low |
| pricing.starting_price | - | `{"amount":6,"currency":"USD"}` |
| pricing.transparent | yes | yes |
| release.history | `[{"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"},{"url":"https://github.com/thunderbird/thunderbird-android/releases/tag/THUNDERBIRD_21_0b2","date":"2026-06-29T21:12:45Z","type":"prerelease","version":"THUNDERBIRD_21_0b2"},{"url":"https://github.com/thunderbird/thunderbird-android/releases/tag/K9MAIL_20_0","date":"2026-06-23T01:45:10Z","type":"stable","version":"K9MAIL_20_0"},{"url":"https://github.com/thunderbird/thunderbird-android/releases/tag/THUNDERBIRD_20_0","date":"2026-06-23T01:45:03Z","type":"stable","version":"THUNDERBIRD_20_0"},{"url":"https://github.com/thunderbird/thunderbird-android/releases/tag/THUNDERBIRD_21_0b1","date":"2026-06-22T17:24:23Z","type":"prerelease","version":"THUNDERBIRD_21_0b1"},{"url":"https://github.com/thunderbird/thunderbird-android/releases/tag/THUNDERBIRD_19_2","date":"2026-06-04T19:32:37Z","type":"stable","version":"THUNDERBIRD_19_2"},{"url":"https://github.com/thunderbird/thunderbird-android/releases/tag/K9MAIL_19_2","date":"2026-06-04T19:32:32Z","type":"stable","version":"K9MAIL_19_2"},{"url":"https://github.com/thunderbird/thunderbird-android/releases/tag/THUNDERBIRD_20_0b2","date":"2026-06-04T18:27:10Z","type":"prerelease","version":"THUNDERBIRD_20_0b2"},{"url":"https://github.com/thunderbird/thunderbird-android/releases/tag/THUNDERBIRD_19_1","date":"2026-06-03T22:11:56Z","type":"stable","version":"THUNDERBIRD_19_1"},{"url":"https://github.com/thunderbird/thunderbird-android/releases/tag/K9MAIL_19_1","date":"2026-06-03T22:11:55Z","type":"stable","version":"K9MAIL_19_1"}]` | - |
| security.disclosure_policy | - | yes |
| 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 | Mozilla Thunderbird | Spike |
|---|:--:|:--:|
| **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 | Free open source | - |

*Source: Vioscale. Generated 2026-09-01T16:53:47.443Z. "-" = undocumented, not absent.*