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As usual, isn't the next question... "What are you trying to build?"

I build most projects in Elixir/Phoenix these days, but wouldn't flinch at ROR if you are comfortable with it.

Right now, an AI tool that generates mockups for branding agencies. But I’m still validating the idea so who knows. Ideally, I would like a stack that would work for most SaaS I may think of building. Tempted to give Elixir Phoenix a try. I briefly tried it a few years back and it just felt right.

As it's just you I'd stick with Ruby on Rails 8[1] as you already know it and I think it could realistically easily achieve what you're proposing.

There's lots of libraries for calling out external AI services. e.g. something like FastMCP[2]. From the sound of it that's all you need.

I'd use Hotwire[3] for the frontend and Hotwire Native if you want to rollout an app version quickly. I'd back it with SolidCache, SolidQueue, etc

I'd use Kamal[4] to run it on cheap hosting using on something cheap from Hetzner.

1. https://rubyonrails.org/

2. https://github.com/yjacquin/fast-mcp

3. https://hotwired.dev/

4. https://kamal-deploy.org/

>What are you trying to build?

Indeed. Not everything even has to be a "web app" in the first place.

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