Using OpenAI's Codex to add a real feature to a real SaaS

Follow along as I use Codex to add a feature to my deep work timer app (and compare it to Cursor!)

Not long ago I shared a deep dive of how I used AI tools to build a simple SaaS app. Well, that app has been chugging along with for a few weeks with a very simple feature set.

Since I use Deep Focus Timer everyday, there’s one thing I’ve found lacking.

You have to pay attention to know when the timer ends.

So I decided I want to add two things:

• The app sh…