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ChatterUI

A frontend for running models on mobile or connecting to your preferred API providers.

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Created 2023-10-18 · Updated 2026-10-15 · #2892 today
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README

ChatterUI - A simple app for LLMs

ChatterUI is a native mobile frontend for LLMs.

Run LLMs on device or connect to various commercial or open source APIs. ChatterUI aims to provide a mobile-friendly interface with fine-grained control over chat structuring.

If you like the app, feel free support me here:

Chat With Characters or Assistants


Use on-device Models or APIs


Modify And Customize


Personalize Yourself


Features:

  • Run LLMs on-device in Local Mode
  • Connect to various APIs in Remote Mode
  • Chat with characters. (Supports the Character Card v2 specification.)
  • Create and manage multiple chats per character.
  • Customize Sampler fields and Instruct formatting
  • Integrates with your device’s text-to-speech (TTS) engine

Usage

Download and install latest APK from the releases page.

iOS is Currently unavailable due to lacking iOS hardware for development

Local Mode

ChatterUI uses a llama.cpp under the hood to run gguf files on device. A custom adapter is used to integrate with react-native: cui-llama.rn

To use on-device inferencing, first enable Local Mode, then go to Models > Import Model / Use External Model and choose a gguf model that can fit on your device's memory. The importing functions are as follows:

  • Import Model: Copies the model file into ChatterUI, potentially speeding up startup time.
  • Use External Model: Uses a model from your device storage directly, removing the need to copy large files into ChatterUI but with a slight delay in load times.

After that, you can load the model and begin chatting!

Note: For devices with Snapdragon 8 Gen 1 and above or Exynos 2200+, it is recommended to use the Q4_0 quantization for optimized performance.

Remote Mode

Remote Mode allows you to connect to a few common APIs from both commercial and open source projects.

Open Source Backends:

  • koboldcpp
  • text-generation-webui
  • Ollama

Dedicated API:

  • OpenAI
  • Claude
  • Cohere
  • Open Router
  • Mancer
  • AI Horde

Generic backends:

  • Generic Text Completions
  • Generic Chat Completions

These should be compliant with any Text Completion/Chat Completion backends such as Groq or Infermatic.

Custom APIs:

Is your API provider missing? ChatterUI allows you to define APIs using its template system.

Read more about it here!

Development

Refer to CONTRIBUTING.md

Acknowledgement

  • llama.cpp - the underlying engine to run LLMs
  • llama.rn - the original react-native llama.cpp adapter