Email and newsletters

Superhuman 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

Foundry376/Mailspring17,726GPL-3.0A beautiful, fast, cross-platform desktop email client with built-in account sync and modern UI.Open on GitHub cloudflare/agentic-inbox6,757Apache-2.0A self-hosted, AI-enabled web email client that runs on Cloudflare Workers and interacts with inboxes.Open on GitHub

What you give up either way

Integrated Docs, Databases, and Go proactive assistant
800+ built-in integrations and two‑way sync with enterprise tools
Grammarly-built writing features and brand‑level polish
Enterprise security, SSO, and admin controls

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