If you ship Claude, GPT, or Gemini calls from a React Native app, you have a problem nobody's solved well, you don't know what's happening on the device. Server-side observability is excellent. Langfuse, Helicone, LangSmith, Stripe's token-meter all work amazingly for Node backends. None of them work cleanly in an Expo app they assume a server, they pull Node only APIs they don't ship AsyncStorage adapters and streaming breaks under Hermes. So I built it. react-native-llm-meter is on npm. Currently three providers, two storage adapters, streaming TTFT, dev overlay, budget alerts, optional remote sink. npm install react-native-llm-meter @react-native-async-storage/async-storage Enter fullscreen mode Exit fullscreen mode import { Meter , MeterProvider } from " react-native-llm-meter " ; import Anthropic from " @anthropic-ai/sdk " ; const anthropic = new Anthropic ({ apiKey : process . env . EXPO_PUBLIC_ANTHROPIC_API_KEY }); const meter = new Meter (); const client = meter .…