ONCE with David Heinemeier Hansson & Kevin McConnell

In this episode of RECORDABLES, we dive into the thinking behind the ONCE open source app server and what it takes to turn self-hosted software into something anyone can run. David Heinemeier Hansson and Kevin McConnell walk through the shift from single-app installs to a console-like system that can run multiple applications on one machine, and the philosophy that guided that evolution.

Along the way, they explore the tradeoffs between simplicity and flexibility, the role of Docker and Kamal in making deployments seamless, and why ease of use matters more than raw capability. This conversation is a look at packaging complexity into something approachable and how ONCE aims to make running your own software feel fast, fun, and accessible.

*Timestamps*

00:00:00 — Introduction
00:01:06 — What ONCE is and why it became open source
00:03:42 — Running multiple apps on a single machine
00:10:16 — Why single-machine deployments work today
00:17:47 — Balancing simplicity with flexibility
00:26:11 — Installing apps in seconds
00:36:47 — When to use ONCE vs. Kamal

For the full episode transcript, visit https://dev.37signals.com/