Hammer AI

HammerAI is software for conversational AI characters, roleplay, interactive stories, and creative world-building. It provides a browser application using cloud-hosted models, while its desktop application can run compatible language models locally.

The product supports character creation, personas, group chats, lorebooks, story writing, image generation, and text-to-speech. Its local desktop mode is designed for offline use and keeps local conversations on the user’s device.

Users can browse or create AI characters with custom personalities, backstories, avatars, and conversation settings. HammerAI also supports personas, group chats with multiple characters, and lorebooks for persistent world information.

The desktop application packages Ollama and supports llama.cpp-based operation. Users can download compatible local models, choose quantizations, and connect compatible external services through a proxy configuration.

Premium cloud capabilities include additional language models, image generation models, text-to-speech voices, larger context windows, and automatic conversation memory. The service also supports interactive story creation and character voice output.

HammerAI offers a free plan with local model access, proxy support, a daily cloud messaging allowance, and limited cloud model access. The desktop application can run local models without a subscription.

Paid subscriptions are Starter at $9 per month, Advanced at $18 per month, and Ultimate at $35 per month. Paid tiers add unlimited cloud messaging, larger context windows, more cloud models, image generation, text-to-speech, and monthly credits.

One-time credit packs range from $1.99 for 200 credits to $99.99 for 20,000 credits. The pricing page states that credits support cloud image generation and text-to-speech. It also states that purchases are final and not refundable.

Pros

• Offers web, desktop, Android, and iOS access.
• Provides a free local-model experience through the desktop app.
• Supports offline use when local models are installed.
• Combines character chat, stories, group chats, lorebooks, images, and voice output.
• Can connect to compatible third-party LLM services through proxy settings.

Cons

• Local performance depends on the user’s hardware and selected model.
• Premium image and text-to-speech usage consumes credits.
• The product does not document a separate public developer API.
• Linux updates require manual installation according to the documentation.
• Official independent review coverage is limited.

Comparable products include Character.AI for hosted character conversations, NovelAI for AI-assisted storytelling and image generation, SillyTavern for configurable character chat with external model providers, and Backyard AI for local and hosted character interactions.

HammerAI is most differentiated by combining a hosted character platform with a packaged desktop experience for local Ollama-based models.

Does HammerAI have a free plan?

Yes. The free plan provides access to local models, external proxy configurations, limited cloud messaging, and a limited selection of cloud models.

Is HammerAI available offline?

Yes. The desktop application can operate offline when users run local models. Cloud models, image generation, and cloud text-to-speech require an internet connection.

Which operating systems does the desktop app support?

The desktop application supports Windows, macOS, and Linux. Linux packages are available in Debian, Flatpak, and RPM formats.

Does HammerAI provide an API?

HammerAI documents proxy support for compatible external LLM APIs, including services such as LM Studio, OpenRouter, and Featherless. A separate public HammerAI developer API was not verified.

Does HammerAI offer a free trial?

The product offers a free plan rather than a separately described time-limited trial.

Which integrations are documented?

Official documentation identifies Ollama and llama.cpp for local execution. Proxy documentation also identifies LM Studio, OpenRouter, Featherless, and other compatible API-based LLM services.