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
Built-in Protection
Sounds Human, Not AI
PostMaster includes 80+ anti-patterns that catch common AI phrases before they make it into your content. Your writing stays authentic and natural.
Built-in Protection
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.
The Story
Why PostMaster Exists
Built by a writer frustrated with generic AI content.
The Problem with AI Writing
When I started using AI to help with writing, I kept running into the same frustrating problem that the content sounded generic. It had that unmistakable AI quality that people call "AI slop." The tone was off, the phrasing felt cookie-cutter, and most importantly, it didn't sound like me. I mean how many posts have you seen that mention "The Key Takeaway?" ?
I realized I wasn't alone. Many writers want to leverage AI's capabilities such as its speed, its ability to handle research, its knack for generating variations but they don't want to sacrifice their voice or settle for mediocre output.
That's why I built PostMaster. I wanted a tool that would let me tap into multiple AI models, allow me to iterate with AI, avoid using common AI pharases, and leverage my personal writing style. Your unique voice is a competitive advantage, don't lose it to AI.
Himanshu Gupta
Creator of PostMaster
About Me
I'm currently a Principal Solutions Architect at Solace, where I work with event-driven architectures and distributed systems. With a passion for writing and explaining complex technical concepts, I have written numerous blog posts since 2014 and many technical white papers.
When I'm not designing systems or blogging, I'm usually tinkering with AI to build practical applications that solve real problems, like PostMaster.
Ready to write with intention?
PostMaster runs locally. Your API keys, your content, your control.