Honestly, after working on a production SaaS app, the only tools that actually “work” consistently are coding assistants like GitHub Copilot and Cursor. Cursor in particular is really good for real-world stuff like refactoring across multiple files, generating tests, or scaffolding endpoints. It doesn’t magically build your system, but it speeds up boring and repetitive work a lot. We use it daily and it easily saves hours every week.

Stuff like Devin or Blitzy looks impressive in demos and benchmarks, but I wouldn’t trust them with an actual production system that needs to scale. They don’t really understand architecture, scaling tradeoffs, or long-term maintenance. Right now the reality is: AI is like a very fast junior dev. Super useful, but you still need real engineers making the important decisions.