Kosh vs Proton Mail
Private custom domain email without extreme per-user price tags.
Proton Mail is popular for individual privacy enthusiasts, but scaling custom domains for a team gets prohibitively expensive ($8 to $13/user/month). Kosh delivers private custom domain email with zero tracking and modern team collaboration at a fraction of the cost.
Per-seat pricing that multiplies with every hire and alias you add.
Save over $1,900/year for team custom domain mailboxes
Why Modern Teams Switch to Kosh
Affordable Team Scaling
Proton penalizes you heavily for each additional team member with a custom email. Kosh gives you custom domain mailboxes that scale effortlessly.
Zero Inbox Mining
Get the privacy and confidentiality your business deserves without compromising on team collaboration or paying exorbitant per-seat costs.
Seamless Web & Client Access
No need to run complex desktop bridge applications or manage local decryption daemons to route team mail.
Annual Cost Comparison
See how annual expenses compound as your team scales.
| Team Size | Proton Mail | Kosh | Annual Savings |
|---|---|---|---|
| 5 Mailboxes | $480/yr | $60/yr | +$420/yr |
| 15 Mailboxes | $1,440/yr | $60/yr | +$1,380/yr |
| 25 Mailboxes | $2,400/yr | $60/yr | +$2,340/yr |
| 50 Mailboxes | $4,800/yr | $149/yr | +$4,651/yr |
Detailed Feature Comparison
| Feature | Kosh | Proton Mail |
|---|---|---|
Team Custom Domain Pricing Affordable domain email built for businesses. | Predictable Flat Plans | $8 - $13 / user / month |
Instant 60s Setup Automated DNS record feedback. | Supported | No |
Zero Tracking & Ad Profiling Total privacy for your business communication. | Supported | Supported |
Native Webhook & Routing APIs Developer-friendly email infrastructure. | Supported | No |
Switch in 3 Simple Steps
Zero downtime. Never lose an incoming email during transition.
Add Your Domain
Enter your custom business domain into Kosh.
Add DNS Records
Copy our pre-generated MX, SPF & DKIM keys to your registrar.
Start Sending
Automated verification confirms active propagation in 60 seconds.
Frequently Asked Questions
Is Kosh as private as Proton Mail?
Kosh enforces zero-tracking, zero-ad-mining, and complete private mailbox isolation without charging extreme per-seat prices.
Switch from Proton Mail today
Get private custom domain mailboxes that scale effortlessly with your team.