A ground-up rebuild of the native macOS AI chat client — now with multi-provider support, structured brainstorming, model comparison, and much more.

What's New

Multi-Provider Support

ChatHarbor now works with four AI providers out of the box. Switch between them freely, mix and match across conversations, or pit them against each other in a comparison.

Ollama — Run local models like Llama 3, Mistral, and CodeLlama entirely on your Mac. Pull, manage, and delete models right from the app.
OpenAI — GPT-4o, GPT-4, o1, o3-mini, and more.
Anthropic — Claude Opus, Sonnet, and Haiku (latest versions).
Apple Intelligence — On-device, private, and free. Requires macOS 26+.

All providers stream responses in real time with a unified interface. No need to juggle multiple apps.

Multi-Method Brainstorming

An entirely new way to use AI — structured brainstorming sessions that walk you through proven creative thinking frameworks:

Osborn Method — Classic divergent ideation → convergent evaluation → synthesis.
Six Thinking Hats — Parallel thinking from six perspectives (facts, emotions, caution, optimism, creativity, process).
Reverse Brainstorm — Ask "how could we make this worse?" then invert the answers into real solutions.
Round Robin — Structured turns where each response builds on the last.
Custom — Define your own roles, prompts, and flow.

Each session progresses through phases (Setup → Framing → Ideation → Evaluation → Synthesis) with user checkpoints between steps so you stay in control. Sessions track discrete ideas, token usage, and performance stats. Export a full session report when you're done.

Model Comparison

Send the same prompt to 2–4 models simultaneously and watch them respond side by side. Compare quality, speed, style, and cost at a glance — with token counts, generation duration, and tokens-per-second for each response.

Conversation Forking

Right-click any message and fork the conversation to a different model. The entire history replays through the new provider so you can see how a different model would have handled the same thread. Forks can be nested, and the sidebar groups them hierarchically under the original conversation.

Prompt Library

Eight built-in system prompt templates — Default, Code Assistant, Writing Editor, Research Analyst, Socratic Tutor, Concise, Creative Writer, and Devil's Advocate — plus the ability ...

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