vioscale
Comparison

Mailspring vs Proton Mail

No leader: the top candidate Mailspring has only 0.29 confidence (low), below the 0.35 needed to declare a winner. The attribute-by-attribute breakdown below, with a source and date on every value, is the honest way to compare them.

Mailspring full profile →Proton Mail full profile →
Machine formatsJSONMarkdownGraphQLor send Accept: application/json
Mailspring66
Proton Mail50
Score
Vioscale score
Mailspring66 / 100low · 29%
Proton Mail50 / 100high · 76%
Pricing
Free tier
Mailspring✓
Proton Mail✓
Model
Mailspringcommercial
Proton Mailfreemium
Price level
Mailspringlow
Proton Maillow
Starting price
Mailspring$8
Proton Mail–
Transparent
Mailspring✓
Proton Mail✗
Integrations
Count
Mailspring7
Proton Mail11
Security
Gdpr
Mailspring–
Proton Mail✓
Hipaa
Mailspring–
Proton Mail✓
Iso27001
Mailspring–
Proton Mail✓
Pci
Mailspring–
Proton Mail✓
Reliability
Sla pct
Mailspring–
Proton Mail99.95
Adoption
Github stars
Mailspring17,762
Proton Mail–
Activity
Commits last 30d
Mailspring38
Proton Mail–
Release
Cadence days
Mailspring15
Proton Mail–
History
Mailspring20 items
Proton Mail–
License
Spdx
MailspringGPL-3.0
Proton Mail–
Language
Primary
MailspringJavaScript
Proton Mail–
Market
Availability

Capabilities

Feature-by-feature on the axes that matter for email clients. “-” means undocumented, not absent.

Capabilities
Deployment model
MailspringLocal direct imap client
Proton MailCloud synchronization proxy
Universal imap smtp exchange support
Mailspring✓
Proton Mail✓
Keyboard shortcut only navigation speed
Mailspring-
Proton Mail✗
Split inbox AI auto categorization
Mailspring-
Proton Mail✗
Read receipts and open tracking
Mailspring✓
Proton Mail✗
Snooze and scheduled send later
Mailspring✓
Proton Mail✓
Generative AI LLM email drafting
Mailspring-
Proton Mail✗
Conversational chat layout view
Mailspring-
Proton Mail✗
Unified multi account inbox view
Mailspring✓
Proton Mail✓
Pgp end to end encryption support
Mailspring-
Proton Mail✓
SOC2 type ii
Mailspring-
Proton Mail✗
ISO 27001
Mailspring-
Proton Mail✓
Pricing model
MailspringFreemium
Proton MailFreemium

What each one is

The product in its own terms, so the numbers below have context.

Mailspring

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.

Independently observed

Proton Mail

An email platform that uses end-to-end encryption to protect message contents from server access. Funded by subscribers rather than data exploitation, it provides privacy-focused communication for individuals and businesses with features like password-protected emails, alias generation, and team management tools.

Independently observed

Pricing

List pricing as published by each vendor, with the date we read it. Always verify at the source before you buy.

Mailspring

from $8/mofreemiumFree tier

Free tier available; Pro at $8/month

  • FreeFree
    • Multi-account support
    • Unified inbox
    • Snooze
    • Send later
    • Mail rules
    • +4 more
  • Pro$8/month
    • Read receipts
    • Link tracking
    • Unlimited snooze and send later
    • Mailbox analytics
    • Contact and company profiles
as of verify ↗

Proton Mail

freemiumFree tier14-day trial
  • Essential-
    • Unlimited logins, notes, and credit cards
    • Browser, mobile, and desktop apps
    • Secure vault, item and link sharing
    • Built-in 2FA authenticator
    • Dark Web Monitoring
    • +2 more
  • Plus-
    • SSO and SCIM
    • Access to Proton Sentinel
    • File storage up to 100 MB
    • SIEM integration
    • Command line interface (CLI)
    • +1 more
  • Workspace Standard-
    • 1 TB storage per user
    • 15 custom email domains
    • Secure personal and shared calendar
    • Cloud storage and sharing
    • User permissions and access management
    • +1 more
as of verify ↗

Platform & deployment

Where each product runs and how it can be hosted. A dash means undocumented, not unsupported.

Platforms
Web
Mailspring✗
Proton Mail✓
iOS
Mailspring✗
Proton Mail✓
Android
Mailspring✗
Proton Mail✓
macOS
Mailspring✓
Proton Mail✓
Windows
Mailspring✓
Proton Mail✓
Linux
Mailspring✓
Proton Mail✓
CLI
Mailspring✗
Proton Mail✓
Deployment
Cloud / SaaS
Mailspring–
Proton Mail✓

Integrations

What each product connects to. Counts come from the vendor's own integration directory where one exists.

In common (2)
  • Gmail
  • Yahoo!

Mailspring

8 total - 6 not shared
  • iCloud
  • Office 365
  • FastMail
  • Outlook.com
  • IMAP
  • SMTP
Independently observed

Proton Mail

11 total - 9 not shared
  • Outlook
  • Apple Mail
  • Thunderbird
  • Google
  • Okta
  • Microsoft Entra ID
  • ADFS
  • Edugain
  • SimpleLogin
Independently observed

Comparison generated from independently-sourced facts. Every value links to its source and retrieval date. See the method.