HEY Email vs Mattermost
The ultimate side-by-side head-to-head analysis for 2026.
Short answer
- Price: not directly comparable — HEY Email is from $8/user/mo, Mattermost is free tier available.
- How to start: HEY Email is from $8/user/mo, Mattermost is free tier available.
These lines are generated from the pricing we track, not from a paid placement. We do not publish a quality score, because we do not have one we can stand behind. They cannot tell you which tool fits your workflow — the sections below are there for that. How we score tools.
HEY Email
Mattermost
Category
Communication
Communication
Base Price
$8/user/mo
Free tier
Public API
No
Yes
Mobile app
Yes
Yes
Open source / self-hostable
No
Yes
SSO (SAML)
No
Yes
Choose HEY Email if:
Privacy Seekers and Busy Professionals who hate email.
Choose Mattermost if:
Organisations that cannot put internal conversations on a third-party service.
HEY Email: pros & cons
- Total Privacy: Automatically blocks all tracking pixels used by marketers.
- Screening: No more spam or unwanted emails ever—you approve every new sender.
- Aesthetic UI: A completely fresh, modern take on what an email app looks like.
- Productivity: Features like 'Reply Later' and 'Set Aside' keep your inbox clean.
- Subscription Only: There is no free version of HEY; it is a premium service.
- No Folders: It uses a specific organization system that might be jarring at first.
- Locked Domain: Requires using an @hey.com address (unless you use the more expensive custom domain plan).
Mattermost: pros & cons
- Fully self-hostable, including in air-gapped environments
- Familiar channel-based interface
- Open source core
- Ecosystem of integrations is smaller than Slack's
- You carry the upgrade and backup burden
- Mobile apps lag behind commercial rivals
Our verdict on HEY Email
The most innovative and peaceful way to handle email in the 21st century.
Our verdict on Mattermost
The right call when self-hosting is non-negotiable. Otherwise the convenience gap with hosted chat is wide.