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Building a tiny Windows tray app with .NET 9 Native AOT and raw Win32

I built CreditMeter, a small Windows tray app that shows GitHub Copilot AI-credit usage like a taxi meter. Why I built it Agentic coding makes AI usage feel invisible until you look at the bill. Con

I built CreditMeter, a small Windows tray app that shows GitHub Copilot AI-credit usage like a taxi meter.

Why I built it

Agentic coding makes AI usage feel invisible until you look at the bill.

Constraints

  • no WinForms
  • no WPF
  • no backend
  • no telemetry
  • no dependency-heavy architecture

Tech stack

  • C# / .NET 9
  • Native AOT
  • raw Win32 / PInvoke
  • GitHub REST API
  • DPAPI for local PAT storage

What I learned

For tiny tools, architecture is also about knowing what not to add.

Repo

https://github.com/cdilorenzo/CreditMeter

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