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[ARTICLE · art-34969] src=sinceerly.com ↗ pub= topic=ai-tools verified=true sentiment=· neutral

Sinceerly, AI to undo your AI writing

Ben Horwitz launched Sinceerly, an AI tool designed to remove AI-generated language from writing, after cold emailing five Fortune 500 CEOs and receiving four replies with typos and errors.

read1 min views1 publishedJun 20, 2026

Hi, I'm Ben. I got sick of everyone in my inbox sounding like AI.

So I built Sinceerly.

I tested Sinceerly by cold emailing 5 Fortune 500 CEOs.

4 CEOs replied. Of those replies, each was under 10 words. 2 replies had typos. One reply called me Larry (my name is Ben).

LMK what you think.

source & further reading
sinceerly.com — original article
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