AI text editor that purposely messes up your emails goes viral

by

A recently popular AI tool is gaining attention for intentionally making writing worse, rather than helping to improve it – a surprising twist compared to typical editing programs.

Okay, so I just heard about this Chrome extension called Sincerely, and it’s wild. Basically, it’s like the opposite of Grammarly! Instead of fixing your writing, it deliberately messes it up – adds typos, uses simpler words, and makes the grammar kinda loose. Apparently, the idea is that with AI writing getting so good, perfect text actually looks fake. So, Sincerely tries to make your writing seem more human by making it a little messy, which is a pretty clever idea, honestly.

This browser extension subtly changes text to sound more human and less like it was written by a machine.

The tool offers different writing styles, like “Subtle,” “Human,” and “CEO.” Each style makes the writing more informal and less polished. The “CEO” mode, in particular, creates short, direct messages similar to those you’d expect from a busy executive.

The goal is to make emails sound more genuine. AI-generated replies can sometimes come across as too stiff or like they’re based on a standard form, particularly in business communication.

Creator claims it helped land replies from Fortune 500 CEOs

Ben Horwitz developed Sincerely and first announced it on social media, positioning it as an alternative to Grammarly.

Horwitz created a tool that intentionally adds errors to emails, jokingly calling it the opposite of Grammarly. He shared a demonstration of the extension, explaining it ‘messes up your emails with AI’.

Okay, so I tested out this tool, Sinceerly, by emailing five CEOs of huge companies – Fortune 500 level. Seriously, four of them actually replied! But it was weird – every response was super short, like under ten words. And two of the CEOs made typos in their replies. The strangest part? One of them called me Larry, and my name is Ben! I’m starting to think Sinceerly puts you in ‘CEO mode’ and they just skim everything. It definitely works, but it’s… odd.

— Ben Horwitz (@horwitzben) April 23, 2026

He later claimed the tool produced real-world results after testing it with cold emails.

Horwitz reported that his tool, Sinceerly, is effective. He tested it by emailing five CEOs from Fortune 500 companies and received responses from four of them. Interestingly, all the replies were very short—less than ten words each. Two of the responses even contained typos, and one CEO mistakenly referred to him as ‘Larry’ instead of his actual name, Ben—leading Horwitz to jokingly speculate that the CEO might have been using Sinceerly to quickly scan emails.

Read More

2026-04-24 18:49