I Fed My 10 Best Blog Posts to 5 Different AI Writing Tools. None of Them Nailed My Voice.

Last month I published a breakdown of 500 AI-generated LinkedIn posts and why they all sound the same. The response was interesting — a lot of people agreed with the problem, but several pushed back with the same argument: "Just give the AI examples of your writing. Problem solved." Fair point. I should test that. So I did. I took 10 of my best-performing blog posts — pieces with real engagement, real comments, real shares — and fed them to 5 AI writing tools that claim to learn or match your style. Then I asked each tool to write a new post on a topic I've covered before. The results were... educational. The Setup I wanted this to be as fair as possible, so here's what I did: My 10 reference posts covered a range of topics: SaaS growth, content strategy, AI tools, personal branding. Word counts ranged from 800 to 2,400 words. All had performed above my baseline engagement metrics. The 5 tools were a mix of dedicated AI writing platforms, general-purpose LLMs with "custom instructions,