How can I code on Android without a computer?

Short answer

PocketCode is a full IDE that runs on your phone — no computer needed. Write code in an LSP-powered editor (39 highlighted languages, 19 with a one-tap language server), run code on the device (16 languages and file types, with debugging for JavaScript), use the terminal and databases, and keep working with no connection once you're signed in (you need one to sign in; the AI chat, remote Git and deploys need one too). Everything installs from one Android 9+ app; the main runtimes are bundled and only the optional Lua, Go and Rust-style packs are downloaded.