Thunderbird vs Mailspring: catalog facts
 Thunderbird |  Mailspring |
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Free Free forever, funded by donations. |
Freemium The client is free and open source. Mailspring Pro is a monthly subscription that adds… |
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Windows, macOS, Linux, Android |
Windows, macOS, Linux |
- Unified inbox across every account, or each account kept separate, your choice
- Mail, calendar, contacts and tasks in one application rather than four
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- Unified inbox, snooze, send later, rules and templates in the free tier
- C++ sync engine keeps memory and battery use down for an Electron app
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- The interface carries a lot of history and can feel dense next to a webmail tab
- Major ESR releases have historically been disruptive for add-ons and settings
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- Read receipts and link tracking are paid, and are tracking features
- Electron, so still heavier than a native client
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Downloadable app |
Downloadable app |
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Open source |
Open source |
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License: MPL-2.0 |
License: GPL-3.0 |
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No account needed |
No account needed |
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Works offline |
Works offline |
Checked September 20, 2026 | Checked September 21, 2026 |
Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.
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