I built a freelancer app in Flutter with zero Flutter experience — here's what I learned, and I need 12 beta testers

A few months ago I kept ending weeks feeling like I'd worked hard but had nothing to show for it financially. I knew my hourly rate. I knew roughly how many hours I'd worked. But the math never added up clearly in my head.

Then I did it manually one day — wrote down my rate, the hours I actually logged, and the hours I should have logged. The "missed" column hit different. Not in a motivational poster way. In a "oh, I left $340 on the table last Tuesday specifically" way.

That number — the missed income — is what most freelancers never see. They feel it at the end of the month when revenue is low, but they can't trace it to actual days.

So I built Billd. An Android app that shows you two numbers every day: what you earned, and what you missed.

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The build itself was a bit chaotic. I'd never touched Flutter before. The entire app is one file (lib/main.dart — yes, I know). Local storage only via SharedPreferences. Daily notification at 6PM asking if you've logged. No backend, no accounts, nothing to sign up for.

I built it in 15-30 minute slots around work. Tested it on my own Realme Android 15 device. It does exactly one thing and I think that's the point.

It's sitting in closed testing on Google Play right now. Before I can apply for production, I need 12 people to test it for 14 days.

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If you freelance and have an Android phone, I'd genuinely appreciate you trying it. The beta signup takes 30 seconds — I just need your Gmail to add you to the Play Store test group:

https://forms.gle/5KeUW3XF5HYeHxq7A

Happy to answer anything about the build — the Flutter learning curve, the single-file decision, the notification setup, whatever. And if you've shipped something similar or have thoughts on the "missed income" concept, I'm all ears.

Update: Beta is live on Google Play.
If you freelance on Android, you can join directly here — no form needed anymore:
https://play.google.com/apps/testing/build.gradle.kts
Just click "Become a tester" and install. Takes 60 seconds.