Open Source

Cosmic IDE

A desktop-class IDE for Android, powered by a full Linux environment.

KotlinJavaC/C++Arch Linux ARMGradleLSP

An open-source, general-purpose integrated development environment built for Android devices. Powered by an embedded Arch Linux ARM environment with pacman integration, it provides real compilers, Gradle builds, LSP diagnostics, a full terminal, and Git support — all running offline on a phone or tablet.

Key Features

• Full embedded Arch Linux ARM environment (no root required)
• Package management via pacman
• Java, Kotlin, C, C++, Scala, and Zig compilation
• Language Server Protocol support
• Integrated terminal and Git version control
• Bytecode disassembly and inspection

Screenshots

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Scala code completion in Cosmic IDE powered by Metals language server
Integrated build output and Gradle task execution in the terminal
Inline Java error diagnostics, type checking, and quick fixes
Java autocomplete and IntelliSense backed by Eclipse JDT LS while a Gradle app runs
Detailed Java symbol information and documentation preview
Tree-based project explorer with multi-module navigation and file management

Architecture & Engineering

Traditional mobile code editors rely on remote compilation servers or heavily stripped-down runtimes. Cosmic IDE takes a fundamentally different approach: it hosts a full Arch Linux ARM environment inside Android user-space using PRoot virtualization. No root access or bootloader unlocking is required.

Core Capabilities

Arch Linux Toolchain

Uses pacman package management to pull compiler builds directly onto your device, installing native clang, rustc, openjdk, and build utilities without modification.

Language Server Protocol

Integrates LSP clients connecting to Eclipse JDT LS for Java and Metals for Scala, delivering desktop-level semantic autocomplete, refactoring, and code navigation.

Native Terminal & Shell

Includes a hardware-accelerated terminal emulator wired directly to your Linux container with zsh/bash, tmux, and full POSIX pipe support.

Offline-First Builds

Gradle, javac, and kotlinc execute locally on ARM processors, turning Android tablets into standalone developer workstations.

Technical Specifications

Virtualization: PRoot-based Linux userland virtualization with rootless UID mapping
Package Feed: Arch Linux ARM repositories with pacman dependency resolution
Build Automation: Full Gradle and Maven daemon execution
Languages Tested: Java 17-21, Kotlin 1.9+, Scala 3, C/C++, Rust, Zig