Sincerely is a Google Chrome extension for editing AI-generated (or human-written) emails. Its purpose is to add errors that are typically glossed over by AI tools and to replace some of the obvious AI text “tells,” such as the phrase “Not just X, but Y.” The em dash also falls into the latter category – but as a longtime writer, I’m fond of them and hate how blatantly it has become a sign of AI. Regardless, Sincerely will kill the em dash, as stated on its website.
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The tool has three modes: micro, manual and CEO. Each presents text more and more casually, where “CEO” mode doesn’t even have correct punctuation, but definitely focuses on “sent from my iPhone.”
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Sincerely is free for up to three email rewrites and works within Gmail. But if you’re willing to pay $4.99 per month, you get unlimited rewrites, can switch between modes instantly, and caches the results so you can reopen them right away.
According to the website, Sincerely was created by Ben Horwitz, an investment partner at the venture capital firm Dorm Room Fund.
The concept of using AI to generate text, just by having another AI tool make it sound more human, is pretty absurd, but it might be a perfect summary of popular opinion towards AI-generated copy in 2026. (Last month, major publisher Hachette dropped the novel.) shy girl Due to allegations that it was AI-generated and/or poorly written.)
It could be easier – die down — Write the text yourself.
Subject
artificial intelligence
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