Founders coding with AI tend to land in the same place. The first version is a $200/month no-code stack: a page builder, a chatbot, an auth gate, a workflow tool, two or three other SaaS seats glued together. The second version is a Rails app on a single host that costs $40/month. The transition keeps coming up in client conversations, and the math changes the day you decide to rebuild.
Most online answers about what that math actually is are partial. Hosting articles list the host's monthly fee and stop. Stack articles list the tools without prices. Nobody adds it up.
Here is the math, for a one-Rails-app SaaS, from MVP through validated to growing. Real numbers, all the line items, four host options ranked by what I'd actually pick today.
Hosting: the four real options for Rails in 2026
For a Rails app you actually own, four hosts cover almost every reasonable case. Ranked by what I'd recommend right now.
