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ChatterUI vs GPTMobile: catalog facts
ChatterUI	GPTMobile
Free Free to download from its GitHub repository.	Free The app is free and open source; API usage is billed by each model provider.
Android	Android
Runs models on the phone itself Can also connect to API providers of your choice	Compares answers from several models at once Supports OpenAI, Anthropic, Google, Groq and Ollama
On-device performance depends on the phone's hardware The research does not state the license	Requires your own API keys or an Ollama server Android only
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0-only
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.