Stello is a free, open-source desktop app for sending secure, interactive newsletters — think of it as a privacy-first alternative to platforms like Mailchimp.^1
Unlike traditional newsletter services, Stello doesn't store your data on a central server. Everything lives on your own device, and messages are encrypted before they ever leave your computer. Recipients simply click a link to view your newsletter in their browser — no accounts, no apps to install, no passwords to remember.^2 Messages can be set to expire or be retracted after sending, giving you control that email alone can never offer.^3
What makes Stello stand apart is how it reimagines what a newsletter can be. Recipients see an interactive, mobile-friendly layout with collapsible sections, embedded slideshows and videos, and the ability to comment and react — features Stello's creator calls "webletters."^4 The design is intentionally simple: you focus on writing, and Stello handles the styling so every update looks clean and readable. Every app Gracious Tech makes is completely free — no cost, no ads, no sign-up, no tracking — released under the MIT No Attribution license so anyone can use and modify it.^6
Why Users Love It"It's so quick and easy to send our news"^1
"We have received way more return messages than ever before"^1
"Love it! This is so easy to read"^1
Notable- Hundreds of missionaries from dozens of mission agencies rely on Stello daily^5
- Available on Windows, macOS, and Linux — also listed on the Microsoft Store^7
- Actively maintained with 2,577+ commits and recent v1.9.14 release (May 2026)^6
- Self-hosting and portable mode options available for advanced users^2
- Donation-funded with no paid tiers or premium features^5
