# Mailspring vs Mimestream

| Attribute | Mailspring | Mimestream |
|---|---|---|
| **vioscaleAI score** | 58.5 (65% (medium)) | 54.4 (54% (medium)) |
| activity.commits_last_30d | 100 | - |
| adoption.github_stars | 17,885 | - |
| content.faq | `[{"answer":"A lightweight desktop application for Mac, Windows, and Linux that brings together multiple email accounts from different providers into one unified inbox. Core features run locally on your computer, with optional paid features for message tracking, scheduling, and productivity analytics. It is indexed under Email Clients.","source":"https://getmailspring.com","question":"What is Mailspring?","confidence":0.6},{"answer":"Mailspring is open source, so it can be self-hosted and used at no licence cost. It is released under the GPL-3.0 licence. A commercial or hosted edition starts at $8 per month. Prices are published openly on the vendor's own pricing page. Pricing changes often, so verify at source before relying on it.","source":"https://getmailspring.com","question":"Is Mailspring free to use?","confidence":0.6},{"answer":"Mailspring supports Windows, macOS and Linux. Platforms we have not confirmed are simply not listed here rather than ruled out.","source":"https://getmailspring.com","question":"What platforms does Mailspring support?","confidence":0.6},{"answer":"We have confirmed 8 integrations for Mailspring, including Gmail, iCloud, Office 365, FastMail, Outlook.com, Yahoo!, IMAP and SMTP. This is what we could verify from public sources, so the vendor may support others we have not indexed.","source":"https://getmailspring.com","question":"What does Mailspring integrate with?","confidence":0.6},{"answer":"Yes. Mailspring is published under the GPL-3.0 licence, a copyleft licence, so check its terms before embedding it in a closed-source product. Licence terms can change between releases, so verify against the repository for the version you intend to use.","source":"https://github.com/foundry376/Mailspring","question":"Is Mailspring open source?","confidence":0.95}]` | `[{"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}]` |
| deployment.options | `{"self_hosted":true}` | `{"cloud":true}` |
| description.long | Mailspring is a desktop email client built as open source that runs your sync engine locally without sending credentials to remote servers. It includes core features like unified inbox, snooze, scheduled sending, and mail rules, with optional premium capabilities available through a paid subscription. | 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. |
| features.capabilities | `{"pricing_model":"freemium","deployment_model":"local_direct_imap_client","read_receipts_and_open_tracking":true,"snooze_and_scheduled_send_later":true,"unified_multi_account_inbox_view":true,"universal_imap_smtp_exchange_support":true}` | `{"pricing_model":"premium_flat_subscription","unified_multi_account_inbox_view":true}` |
| integrations.count | 7 | 3 |
| integrations.list | `[{"name":"Gmail"},{"name":"iCloud"},{"name":"Office 365"},{"name":"FastMail"},{"name":"Outlook.com"},{"name":"Yahoo!"},{"name":"IMAP"},{"name":"SMTP"}]` | `[{"name":"Gmail API"},{"name":"Google Calendar"},{"name":"Apple Calendar"},{"name":"Google","native":true,"category":"email","direction":"bidirectional"}]` |
| language.primary | TypeScript | - |
| license.spdx | GPL-3.0 | - |
| market.availability | `{"primaryMarkets":[],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` | `{"primaryMarkets":["US"],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` |
| platform.support | `{"mac":true,"linux":true,"windows":true}` | `{"mac":true}` |
| pricing | `{"type":"hybrid","plans":[{"free":true,"name":"Free","features":["Unified Inbox","Snooze","Send Later","Mail Rules","Templates"],"description":"Open source version with core email features","contactSales":false},{"free":false,"name":"Mailspring Pro","features":["Link tracking","Read receipts","Mailbox analytics","Contact profiles","Company profiles"],"commitment":"monthly","description":"Premium subscription unlocking additional features","contactSales":false}],"summary":"Free open source core + monthly paid Pro tier","freeTier":true,"sourceUrl":"https://getmailspring.com","retrievedAt":"2026-10-05T10:08:40.523Z","billingPeriods":["month"]}` | `{"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"]}` |
| pricing.free_tier | yes | no |
| pricing.model | freemium | commercial |
| pricing.price_level | low | low |
| pricing.starting_price | `{"amount":8,"currency":"USD"}` | `{"amount":4.99,"currency":"USD"}` |
| pricing.transparent | no | yes |
| release.cadence_days | 12 | - |
| release.history | `[{"url":"https://github.com/Foundry376/Mailspring/releases/tag/1.26.0","date":"2026-10-02T14:37:36Z","type":"stable","version":"1.26.0"},{"url":"https://github.com/Foundry376/Mailspring/releases/tag/1.25.0","date":"2026-09-19T22:57:29Z","type":"stable","version":"1.25.0"},{"url":"https://github.com/Foundry376/Mailspring/releases/tag/1.24.1","date":"2026-09-15T02:13:24Z","type":"stable","version":"1.24.1"},{"url":"https://github.com/Foundry376/Mailspring/releases/tag/1.24.0","date":"2026-09-13T01:27:57Z","type":"stable","version":"1.24.0"},{"url":"https://github.com/Foundry376/Mailspring/releases/tag/1.23.0","date":"2026-07-22T03:45:22Z","type":"stable","version":"1.23.0"},{"url":"https://github.com/Foundry376/Mailspring/releases/tag/1.22.0","date":"2026-06-13T20:30:13Z","type":"stable","version":"1.22.0"},{"url":"https://github.com/Foundry376/Mailspring/releases/tag/1.21.1","date":"2026-05-20T20:31:26Z","type":"stable","version":"1.21.1"},{"url":"https://github.com/Foundry376/Mailspring/releases/tag/1.21.0","date":"2026-05-06T13:40:43Z","type":"stable","version":"1.21.0"},{"url":"https://github.com/Foundry376/Mailspring/releases/tag/1.20.1","date":"2026-04-20T16:07:46Z","type":"stable","version":"1.20.1"},{"url":"https://github.com/Foundry376/Mailspring/releases/tag/1.20.0","date":"2026-04-19T03:40:03Z","type":"stable","version":"1.20.0"},{"url":"https://github.com/Foundry376/Mailspring/releases/tag/1.19.1","date":"2026-04-07T01:34:03Z","type":"stable","version":"1.19.1"},{"url":"https://github.com/Foundry376/Mailspring/releases/tag/1.19.0","date":"2026-03-10T04:46:53Z","type":"stable","version":"1.19.0"},{"url":"https://github.com/Foundry376/Mailspring/releases/tag/1.18.0","date":"2026-02-23T14:40:58Z","type":"stable","version":"1.18.0"},{"url":"https://github.com/Foundry376/Mailspring/releases/tag/1.17.4","date":"2026-02-11T16:59:03Z","type":"stable","version":"1.17.4"},{"url":"https://github.com/Foundry376/Mailspring/releases/tag/1.17.3","date":"2026-01-31T20:21:11Z","type":"stable","version":"1.17.3"},{"url":"https://github.com/Foundry376/Mailspring/releases/tag/1.17.2","date":"2026-01-24T21:09:28Z","type":"stable","version":"1.17.2"},{"url":"https://github.com/Foundry376/Mailspring/releases/tag/1.17.1","date":"2026-01-15T20:55:25Z","type":"stable","version":"1.17.1"},{"url":"https://github.com/Foundry376/Mailspring/releases/tag/1.17.0","date":"2026-01-14T22:33:16Z","type":"stable","version":"1.17.0"},{"url":"https://github.com/Foundry376/Mailspring/releases/tag/1.16.0","date":"2025-07-16T14:29:44Z","type":"stable","version":"1.16.0"},{"url":"https://github.com/Foundry376/Mailspring/releases/tag/1.15.1","date":"2025-01-27T00:52:05Z","type":"stable","version":"1.15.1"}]` | - |

## Capabilities (Email Clients)

| Capability | Mailspring | Mimestream |
|---|:--:|:--:|
| **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 | Freemium | Premium flat subscription |

*Source: vioscaleAI. Generated 2026-10-16T20:49:03.096Z. "-" = undocumented, not absent.*