Email and newsletters

Inbox Zero alternatives

2 open-source projects that already do this job. Free to use - not free to run, which is what the numbers on the right are for.

The full assessment →

The projects

cloudflare/agentic-inbox6,754Apache-2.0Self-hosted web email client with an integrated AI agent running on Cloudflare Workers.Open on GitHub Foundry376/Mailspring17,726GPL-3.0Cross-platform open-source desktop email client with modern features and account sync.Open on GitHub

What you give up either way

Enterprise features: SSO, SCIM, and dedicated onboarding managers
SOC 2 Type 2 certification and related compliance guarantees
Polished integrations and team analytics in the paid product
Priority support and managed uptime/SLAs

An open-source project doing the core job proves a replacement is possible. It does not prove it matches Inbox Zero, and it does not prove anyone has run it for a month. How we decide.