EchoFlow

EchoFlow is a clean Android chat app that connects to OpenRouter — a gateway to hundreds of AI models. You bring your own API key, add any model by its ID (free or paid, frontier or fast), and start talking. Every conversation is stored locally on your phone, so your history is always available even offline, and nothing ever reaches a server. No account, no tracking, no telemetry.

The app is built with Google's Material 3 Expressive design — scalloped shapes, bold typography, and physics-based spring motion make every tap feel responsive. You can switch models mid-chat without losing context, watch reasoning traces stream in a collapsible panel, attach images for vision-capable models, and choose from seven light/dark themes (plus Wallpaper on Android 12+). It's a simple app, but the details are well thought out.

EchoFlow is ideal for anyone who wants a private, flexible AI chat client on their phone. Developers can test models without leaving a conversation, privacy fans can avoid cloud storage, and power users can bring their own OpenRouter key to access the best models available. It's free, open source, and requires nothing but an OpenRouter key.