Aphelion
Local AI desktop app for roleplay, writing and coding. Runs GGUF models with llama.cpp on Windows, Apple Silicon macOS and Linux under the MIT license.
Aphelion is an open source desktop app for people who want character roleplay and writing tools alongside a local AI assistant. It runs on Windows, Apple Silicon macOS and x64 Linux. Conversations, prompts and models stay on your computer, and it works offline after the initial model download. It doesn't require an account or collect telemetry.
The creative workspace supports character chats, group conversations, story writing and branching dialogue trees. Expert assistants can help draft and analyze code or answer questions using reference material from your own PDFs and notes. The app reads relevant passages from folders you authorize rather than sending those files to a cloud service.
Aphelion can create PDFs with math and tables through Typst, save code, HTML and Markdown files, and open existing documents for editing. With an optional vision model, it can answer questions about pictures, describe images for coding work, or collect images matching a description into a PDF.
Its bundled llama.cpp engine runs GGUF models without a separate model service. The app selects a model to fit available memory; a GPU is strongly recommended, though it also runs on weaker hardware. It uses Vulkan on Windows and Linux and Metal on macOS.
The model has no independent access to files, the network or system commands. The app handles authorized file reads and document writes at your direction. Aphelion uses the MIT license; downloaded models retain their publishers' licenses.
The macOS and Linux builds are in beta and have had less testing than the Windows version.
