Vivarium is a long-form AI narrative roleplay and world-simulation web app. The AI controls expression; the application controls reality.https://vivariumonline.com/https://vivariumonline.com/blog/2026-09-20-hello-from-vivarium/https://vivariumonline.com/blog/2026-09-20-hello-from-vivarium/Why this devblog exists and what to expect from it.Sun, 20 Sep 2026 00:00:00 GMT