Atomic Chat

Free, open-source local LLM chat app that runs fully offline

Open Source Writing & Content
Visit Website ↗ by AtomicBot-ai

What is Atomic Chat?

Atomic Chat is an Apache-licensed desktop and mobile app for chatting with large language models entirely on your own device, using GGUF models through llama.cpp. Nothing leaves your machine unless you choose a cloud model, and it even exposes an OpenAI-compatible API on localhost for local development. Native apps cover macOS, Windows, Linux, iOS, and Android, making private AI chat genuinely portable.

Key features

  • Fully offline local LLM chat
  • GGUF model support via llama.cpp
  • OpenAI-compatible local API (localhost:1337)
  • Native desktop and mobile apps

Pros

  • Free and open source (Apache 2.0)
  • Private by design — runs offline
  • Cross-platform including mobile

Cons

  • You supply your own models
  • Performance depends on your hardware

Atomic Chat at a glance

PricingOpen Source
CategoryWriting & Content
Platformswindows, macos, linux, ios, android
CompanyAtomicBot-ai
Official websiteatomic.chat
open-sourcelocal-llmprivacychatbotggufllama.cpp

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Atomic Chat FAQs

What is Atomic Chat?

Atomic Chat is an Apache-licensed desktop and mobile app for chatting with large language models entirely on your own device, using GGUF models through llama.cpp. Nothing leaves your machine unless you choose a cloud model, and it even exposes an OpenAI-compatible API on localhost for local development. Native apps cover macOS, Windows, Linux, iOS, and Android, making private AI chat genuinely portable.

What are the main features of Atomic Chat?

Atomic Chat offers Fully offline local LLM chat, GGUF model support via llama.cpp, OpenAI-compatible local API (localhost:1337) and Native desktop and mobile apps.

How much does Atomic Chat cost?

Atomic Chat is open source, so the software itself is free to download, use and self-host. Your only costs are the infrastructure you run it on and any paid services you connect to it.

What are the pros and cons of Atomic Chat?

Strengths of Atomic Chat include Free and open source (Apache 2.0); Private by design — runs offline; Cross-platform including mobile. On the downside, You supply your own models; Performance depends on your hardware.