AI Writing Assistant That Sounds Human
Write Naturally.
Sound Like You.
PostMaster polishes AI-generated content, catches 80+ AI tells, and adapts to your unique voice so your writing stays authentic.
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
Polish AI content, eliminate generic phrases, and preserve your authentic voice.
The workflow
How PostMaster Works
A deliberate approach to AI-assisted writing that keeps you in control.
Keep Your Writing Human
Built-in detection for 80+ common AI phrases and patterns. PostMaster flags generic language, awkward em-dashes, and corporate buzzwords before they reach your readers.
Learn & Match Your Voice
Share examples of your writing. PostMaster analyzes your style—tone, vocabulary, phrasing—and generates content that sounds like you, not a chatbot.
Polish & Refine Iteratively
Provide feedback, adjust phrasing, tighten flow. Iterate with intelligent suggestions until every sentence feels intentional and authentic.
Advanced: Compare Multiple Models
Power users can run prompts through multiple AI models—OpenAI, Claude, Grok, Mistral, or local models via Ollama—to compare approaches and synthesize the best elements.
Generate Matching Visuals
Create illustrations with DALL-E or Stable Diffusion, integrated directly into your workflow.
Privacy: Use Your Own Keys
Bring your API keys for complete control. No subscriptions, just pay for what you use. Your content never leaves your machine unless you choose to send it to an AI provider.
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.