Mailspring vs Proton Mail
On the evidence we track, Proton Mail leads this comparison with a composite score of 75/100. Scores are only directly comparable because these tools share a category; the full breakdown and every source is below.
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.
Mailspring
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.
Proton Mail
LeaderA cloud-based email platform using end-to-end encryption to keep all messages private from Proton and advertisers, funded by subscriber revenue. It provides a permanent free tier with core email functionality, plus paid plans offering enhanced storage, custom domains, and integrated business services.
Pricing
List pricing as published by each vendor, with the date we read it. Always verify at the source before you buy.
Mailspring
Free open source core + monthly paid Pro tier
- FreeFree
- Unified Inbox
- Snooze
- Send Later
- Mail Rules
- Templates
- Mailspring Pro-
- Link tracking
- Read receipts
- Mailbox analytics
- Contact profiles
- Company profiles
Proton Mail
LeaderFree tier available. Paid plans starting at $12.99/user/month for business bundles.
- FreeFree
- End-to-end encryption
- Email and calendar access
- Workspace Standard$12.99/user/month, billed annually at $155.88
- 1 TB cloud storage
- 15 custom email domains
- VPN access for 10 devices
- 25 booking pages
- Password manager
- +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.
- Gmail
- Yahoo!
Mailspring
- iCloud
- Office 365
- FastMail
- Outlook.com
- IMAP
- SMTP
Proton Mail
Leader- Outlook
- Apple Mail
- Thunderbird
- Okta
- Microsoft Entra ID
- ADFS
- Edugain
- SimpleLogin
- Yahoo Mail
- Chrome
- Firefox
Mailspring or Proton 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.