It's very interesting to see all the Heroku competitors popping up. DigitalOcean launched their app platform. Render.com won TechCrunch Disrupt. Hatchbox.io exists for Rails. I've used Heroku for years now, and it's generally been a pleasant experience. Lately, I've been experimenting with the various competitors, and I'm liking Render the most. I'll definitely give app runner a try.