Hammer AI (HammerAI) is an AI companion and character roleplay platform built around privacy and local-first AI. Its desktop application for macOS, Windows and Linux can run open-source language models locally using Ollama, allowing fully offline, private conversations with AI characters, as well as optional cloud-hosted models for users who prefer not to manage local setups.
The platform lets users create and chat with AI characters across roleplay scenarios, build lorebooks and personas, hold group chats with multiple characters, write stories and generate images. Because local chats are processed on the user's own machine, the company states messages remain private and are deleted when the app closes.
Hammer AI is positioned as a free alternative to subscription companion apps, with both local models and cloud-hosted models advertised as free to chat. It is available via the desktop app, an Android app, and a browser-based web app, with an iOS version in development.
The product is operated by a small independent team and has no publicly disclosed venture funding. It appeals to privacy-conscious users, hobbyist roleplayers and people who want uncensored local AI companionship without ongoing subscription costs.