Meet anti-grammarly: The AI tool that adds mistakes on purpose

A browser tool called 'Sincerly' is making AI writing less perfect on purpose. By adding tiny typos and quirks, it taps into a growing idea. Imperfection might actually feel more real. A tool that makes AI writing worse on purpose sounds odd, but it actually fits perfectly. In a world full of flawless emails, a tiny typo might be what makes something feel real again.

In Short

• “Sincerly” adds typos to AI writing to make it feel human
• Perfect emails are now seen as possible AI-generated text
• Users prefer slightly messy, natural communication

Perfect writing is having a bit of a moment and not in a good way. With AI tools churning out neat, polished emails in seconds, anything that reads too clean can feel suspicious. Enter 'Sincerly' (yes, that spelling is intentional). It is a browser plugin that adds small typos and quirks to AI-generated text so it feels more human.

It sounds like a joke at first, but it is actually tapping into something real, people trust writing that feels natural, not flawless.

WHEN 'SINCERELY' BECOMES 'SINCERLY'

The name says it all. 'Sincerly' drops a letter and that is kind of the whole point.

The tool takes AI-written emails and lightly messes them up. Not in a chaotic way, just enough to mimic how people actually write. A missed letter here, a slightly off phrase there.

Because let’s be honest, most emails are not perfectly edited masterpieces. They are quick, slightly messy and very human.

WHY PERFECT WRITING NOW FEELS OFF

There was a time when flawless grammar was the goal. Now, it can feel like a giveaway.

AI-generated text often has a certain rhythm, too balanced, too polished. It reads well, but sometimes a bit too well.

That is why tools like this are popping up. They break that pattern just enough to make the writing feel believable.

WHERE THE BUZZ STARTED

The idea really picked up after a Harvard Business School student, Ben Horwitz, built what many are calling an 'anti-Grammarly' tool named 'Sincerly'. The goal was simple but oddly relatable. AI writing had become so polished that it all started to look the same.

As reports noted, the tool rewrites text by adding small mistakes to make it feel more human, especially at a time when perfectly written emails are increasingly assumed to be AI-generated.

MODES THAT MAKE IT EVEN MORE FUN

'Sincerly' does not just sprinkle random typos, it plays with tone too.

• One mode keeps things mostly polished but adds a small mistake or two
• Another makes the writing more casual, like a quick message dashed off between meetings
• And then there is a super short, blunt style, basically the “sent from my phone” energy

It is oddly specific, and that is what makes it fun.

WHY PEOPLE ARE ACTUALLY USING THIS

There is a growing pressure to sound authentic, especially in work emails and everyday communication.

Perfect AI text can feel distant. Slightly imperfect text feels relatable.

Even outside of tools like this, people have already been adding typos manually to AI-generated content to make it seem more human. This just automates that habit.

THE IRONY IS KIND OF PERFECT

Years of autocorrect, spellcheck and writing tools trained everyone to avoid mistakes.

Now, a plugin is bringing them back. On purpose.

It is a strange full circle, using AI, then using another tool to make that AI look less like AI.

In a world where machines can write almost perfectly, perfection is no longer the goal.

A tiny typo, a slightly off sentence, these are the things that make writing feel real again. And if that means signing off with 'Sincerly,' so be it.

- Ends