Mozilla Thunderbird vs Spark Mail
No clear leader: Spark Mail (53.2) and Mozilla Thunderbird (48.7) are within the 5-point margin; treat as a tie. The attribute-by-attribute breakdown below, with a source and date on every value, is the honest way to compare them.
Capabilities
Feature-by-feature on the axes that matter for email clients. “-” means undocumented, not absent.
What each one is
The product in its own terms, so the numbers below have context.
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.
Spark Mail
A cross-platform email application offering core email functionality for free, with advanced features and team collaboration available through premium plans. Includes AI-assisted email handling, calendar integration, and task management connectors.
Pricing
List pricing as published by each vendor, with the date we read it. Always verify at the source before you buy.
Spark Mail
Free tier available. Plus $10/user/month, Pro $20/user/month (or annual billing). Enterprise custom pricing.
- FreeFree
- Unlimited email accounts
- Smart search
- Smart notifications
- Scheduled send
- Snooze
- +11 more
- Plus$10/user/month or $120/year
- All Free features
- Comprehensive mail productivity
- Spark +AI (AI assistant)
- Basic team collaboration
- Custom templates
- +2 more
- Pro$20/user/month or $240/year
- All Plus features
- Unlimited +AI meeting notes
- Workflows
- Automatic labels (coming soon)
- Read status
- +4 more
- EnterpriseContact sales
- All Pro features
- Security & control (SOC II compliance)
- Dedicated customer success management
- 1:1 productivity coaching
- Centralized billing
- +1 more
Platform & deployment
Where each product runs and how it can be hosted. A dash means undocumented, not unsupported.
Integrations
What each product connects to. Counts come from the vendor's own integration directory where one exists.
Mozilla Thunderbird
Not documented yet.
Spark Mail
- Asana
- MeisterTask
- TickTick
- Todoist
- Trello
- 2Do
- OmniFocus
- Reminders
- Things
- Evernote
- Instapaper
- OneNote
- Agenda
- Bear
- Notion
- Box
- Dropbox
- Google Drive
- OneDrive
- GoTo Meeting
- Zoom
- Google Calendar
- Outlook
- Microsoft Teams
- +7 more
Mozilla Thunderbird or Spark Mail: which one depends on you
A composite score cannot know your constraints. Describe them and both get re-weighted against what you actually need, with the evidence behind every position.
Free to run, no account needed to start. How the evaluation works
Comparison generated from independently-sourced facts. Every value links to its source and retrieval date. See the method.