A few months ago I had one of those small founder moments that changes how you work.
I was building with LLM APIs all day, shipping fast, testing prompts, swapping models, and doing what every solo founder does when they are in a rush: optimizing for speed instead of visibility.
Then I checked usage and realized I could tell you roughly what I had spent, but not confidently, and definitely not in real time.
That is a bad feeling.
If you are building with AI, your costs are part of your product. They are not some back-office detail you clean up later. Every prompt, every retry, every model switch, every background task affects your margins.
The problem is most AI cost tracking is delayed, buried, or annoying to check.
You finish coding, then open dashboards later.
You guess whether a feature is cheap enough.
You tell yourself you will watch costs once revenue shows up.
Then the bill lands and suddenly you are doing forensic accounting on your own product.
I built TokenBar because I wanted cost visibility where I actually work.
Not another tab.
Not a weekly report.
Not a spreadsheet.
I wanted a live token counter in the macOS menu bar so I could see usage while I was building.
That changes behavior fast.
When cost is visible, you notice things immediately:
- one model is way more expensive than the value it adds
- retries are quietly burning money
- a feature that looked harmless is actually margin poison
- your "cheap" workflow is only cheap because you are not measuring it carefully
This matters even more for solo founders.
When you are early, you do not have layers between product decisions and financial consequences. If your AI costs drift, your pricing gets weird. Your confidence drops. You start making product decisions in the dark.
And honestly, invisible cost is dangerous because it feels harmless right up until it is not.
A lot of founder advice says to just ship, talk to users, and stop overthinking infrastructure. I agree with that. But there is a difference between moving fast and flying blind.
If AI is part of your product, cost visibility is not over-engineering. It is basic instrumentation.
That is why TokenBar exists.
It is a simple macOS app that lets you see token usage in real time, directly from your menu bar, so you can make better calls while you are working instead of after the damage is done.
I built it for myself first, because I was tired of being surprised by the economics of the tools I was using to build.
If that sounds familiar, you can check it out here:
https://tokenbar.site
I think more founders are going to realize the same thing over the next year.
AI features are easy to add.
Profitable AI features are harder.
The gap between those two is visibility.
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