A native Android AI coding agent that runs entirely on the phone. It is an independent project, inspired by OpenCode and interoperable with it, not a build of OpenCode itself.

PhoneCode runs the agent loop on your device. It reads, writes, and edits files in per-project workspaces, runs git natively, searches the web, and talks to whichever model provider you choose. There is no backend, no telemetry, and no account. Your API keys live in the Android Keystore, and your prompts go only to the provider you pick.

Not affiliated with OpenCode. PhoneCode is not built by, endorsed by, or affiliated with the OpenCode team (Anomaly). The name "OpenCode" appears here only to describe interoperability and origins. Parts of the agent (prompt structure, tool schemas, and loop design) are adapted from OpenCode, which is MIT licensed (Copyright (c) 2025 opencode); see LICENSES.

Features

• On-device agent with a full coding-agent tool surface (modeled on OpenCode's): read, write, edit, glob, grep, ls, apply_patch, todo lists, plan and build modes, user questions, subagents (task tool), webfetch with free web search, MCP servers (Streamable HTTP and SSE), and progressive-disclosure skills (SKILL.md).
• Providers: OpenCode Zen and Go, Anthropic, OpenAI, OpenRouter, Google, xAI, Groq, DeepSeek, Mistral, and Together, with the catalog sourced from models.dev. You can enable or disable providers, hide models, and mark favourites. The agent can add providers and models itself by editing providers.json, which is hot-reloaded.
• Sign-in flows: GitHub uses the OAuth device flow (you type a code, with no tokens to paste) for push and pull. "Sign in with ChatGPT" (Codex, OAuth + PKCE) lets you use a paid ChatGPT plan as a provider through OpenAI's Responses API - no API key needed.
• Projects and chats: chats are organized into projects. Each project is its own workspace folder and git repository, with snapshots (commits), branch switching, and push and pull from the chat's git button.
• Streaming chat with reasoning traces, a tool-activity timeline, monochrome syntax highlighting, a context-window gauge, and per-model token limits that drive compaction.
• Privacy by construction: keys are encrypted on-device, crash logs stay local, export and import use a file you choose through the Storage Access Framework, and Auto Backup excludes secrets.

Building

Requirements: JDK 21 and the Android SDK (platform 34 and 36, build-tools 36). Android Studio is not needed.

$env:JAVA_HOME = "<path to JDK 21>"
.\gradlew.bat :app:assembleRelease   # minified release build -> app/build/outputs/apk/release/
.\gradlew.bat :app:assembleDebug     # debuggable build
.\gradlew.bat test                   # all module unit tests (incl. Robolectric UI smoke tests)

The project has four modules. :app holds the Compose UI and Android glue. :agent holds the loop, prompts, and compaction. :provider holds the wire formats and catalog. :tools holds the file, git, web, todo, MCP, and skills tooling. The three library modules are pure JVM and fully unit-tested.

Notes

• The GitHub sign-in ships with the gh CLI's public client id for personal builds. Register your own OAuth app (one checkbox: Enable Device Flow) before distributing.
• Codex (Sign in with ChatGPT) authenticates over OAuth + PKCE with a loopback redirect, stores the tokens encrypted, and talks to ChatGPT's Responses API backend. It needs a paid ChatGPT plan.
• The Terms of Service and Privacy Policy live in legal/ and are also shown in-app under Settings > About.

Licenses

PhoneCode bundles and adapts open-source work. The full list is in THIRD_PARTY.md and in-app under Settings > About > Open-source licenses. In particular:

• OpenCode (MIT, Copyright (c) 2025 opencode) - the agent's prompt structure, tool schemas, and loop design are adapted from OpenCode. PhoneCode is an independent project and is not affiliated with the OpenCode team.
• Mermaid (MIT) - inline diagram rendering. PRoot (GPL-2.0) and talloc (LGPL-3.0) - the Linux sandbox. BusyBox (GPL-2.0) - the on-device shell toolkit.