Proton Mail vs Spark Mail

What Proton Mail is

Proton Mail is an encrypted email service based in Switzerland, built so that the provider cannot read message contents. End-to-end encryption and Swiss jurisdiction are the reasons to choose it, and both are real rather than marketing. The consequence is that server-side features other providers take for granted — full-text search on the server, easy third-party client access — work differently or need a bridge.

What Spark Mail is

Spark is an email client with smart inbox grouping and features for discussing emails inside a team. Discussing an email privately with colleagues before replying is the feature teams actually adopt it for. The smart inbox grouping helps volume, but the client is heavier than minimal alternatives. The desktop and mobile clients share the same rules.

What Proton Mail is built to do

End-to-end encryption

Encrypts messages so the provider cannot read stored content.

Swiss jurisdiction

Stores data under Swiss privacy law rather than US or EU rules.

Custom domains

Runs business mail on your own domain with multiple addresses.

What Spark Mail is built to do

Smart inbox

Groups newsletters, notifications and personal mail separately.

Team discussions

Comments on an email thread privately with colleagues.

Shared drafts

Composes a reply together before it is sent.

Choose Proton Mail if

• People and teams for whom mail confidentiality is a requirement rather than a preference.

Choose Spark Mail if

• Teams that share responsibility for an inbox but do not want a helpdesk.

Proton Mail: pros & cons

• End-to-end encryption by default between Proton users
• Swiss jurisdiction and a clear privacy stance
• Free tier available
• Encryption breaks the usual IMAP workflow
• Search inside encrypted mail is limited
• Costs more than mainstream mail providers

Spark Mail: pros & cons

• Team discussion attached to emails
• Smart inbox reduces clutter
• Free tier is usable
• Emails pass through their servers for some features
• Interface changes have upset long-time users
• Team features need a paid plan