Building a Zero-Cost AI Feature in Flutter with Gemma 4 + Firebase

How to combine on-device inference with cloud sync — without paying a cent in API fees The Unspoken Reality of AI API Costs Here’s the moment every indie developer dreads. You’ve shipped your AI feature. Users love it. It’s working. Then you open your billing dashboard. Every question your users ask costs you money. Every summary generated, every classification run, you’re paying for it. You have created a successful product, but its popularity is now draining your resources. What if there was a