My First Week Tracking AI Costs in Real Time Changed How I Code

I've been building solo for about eight months now, and for most of that time I had zero visibility into what my AI usage was actually costing me day to day. I knew roughly what I was spending monthly — Claude's billing page tells you that. But the real-time picture? Completely blind. I'd open my editor, start iterating on a feature, spend two hours going back and forth with the model, and have no idea whether that session cost me $0.40 or $4. That changed about a week ago when I finally set up TokenBar properly — a little menu bar app that sits in your macOS status bar and shows you token counts and estimated costs as you work. Here's what actually surprised me. Day 1: I was burning tokens on garbage Within the first hour of having real-time visibility, I caught myself doing something dumb. I was asking the model to regenerate entire code blocks when I only needed one function tweaked. Every time I sent the full context unnecessarily, I was pumping in 8-12k tokens for no reason. I kne