Multi-model writing assistant
Skip the AI slop.
Write in your voice.
PostMaster runs your prompts through multiple AI models simultaneously—OpenAI, Claude, Grok, Mistral, or your own local models via Ollama—so you can compare outputs, cherry-pick the best, and synthesize them into content that matches your voice.
v1.2.4 • macOS 12+ / Windows 10+ • All releases
See it in action
A Writing Experience Designed for Focus
Compare outputs, refine your voice, and craft content with intention.
The workflow
How PostMaster Works
A deliberate approach to AI-assisted writing that keeps you in control.
Compare Models
Submit your prompt once, receive outputs from multiple AI models. See how each interprets your request.
Synthesize Results
Pick the strongest elements from each output. Combine them into a cohesive draft that captures your intent.
Refine & Iterate
Provide feedback, adjust tone, tighten phrasing. Iterate until every sentence feels intentional.
Learn Your Style
Share examples of your writing. PostMaster analyzes your voice to generate content that sounds like you.
Generate Images
Create matching visuals with DALL-E or Stable Diffusion, integrated directly into your workflow.
Use Your Own Keys
Bring your API keys for complete control. No subscriptions, just pay for what you use.
Ready to write with intention?
PostMaster runs locally. Your API keys, your content, your control.