Anti-Grammarly AI Tool Adds Typos to Emails to Make Them Appear Human-Written

The 'Anti-Grammarly' Helps People Hide Their Participation in the AI Slop Era

Now that the human race has developed a tool that lets everyone write emails that sound like a pitch deck written by Bryce, who everyone knows is the worst person in the office, the next great leap forward is a tool that makes those emails sound like... let's say Jill, the normal person in the office with whom no one has a problem. How? By introducing human-style mistakes into the text! Are you a secret ChatGPT or Grammarly user concerned that your emails read like AI slop because they are AI slop? That’s not a problem. It’s an opportunity. It’s a chance to use another AI tool, a tool that exists right now. Using this app underscores the importance of credibility, trustworthiness and integrity. It could be said that these new tools are quietly revolutionizing writing. Meet “Sinceerly,†which has missed at least two opportunities by not naming itself either “Sinceer.ly†or “[sic].†The app promises to expunge the telltale signs of AI composition from your emails: “Kill the emdash! [sic] No more 'not justâ€|'! Add some typos!†I fed Sinceerly the second paragraph of this post, which you might notice intentionally contains multiple AI writing tropes that I crafted the old-fashioned way. The app has three settings, which are “Subtle,†“Human,†and “CEO†(appreciate the distinction between Human and CEO). And Sinceerly's efforts at rewriting my ghastly paragraph went as follows: Subtle: “Are you a secret ChatGPT user concerned that your emials read as AI slop? Here's the thing. That's not just a problem, it's also an opportunity. It's a chance to use another AI tool, and you know what? That tool exists right now. It's a tool that shows the importance of credibility, trustworthiness, and integrity. You could say the app is quietly changing how people write.†Human: “Are you a sceret ChatGPT user worried your emails sound like AI? Yeah, that's a problem. But it's also an opening. You can use another AI tool, and guess what? It's already here. It's a tool about credibility, trustworthiness and integrity. The app is changing how people write.†CEO: “writing an email that doesn't sound like AI slop isn't just a problemâ€"it's an opportunity. there's a tool for it, available now. it prioritizes credibility, trustworthiness, and integrity. the app is reshaping how people write.†This is interesting. There are some nice touches: the CEO’s disdain for initial capitals and their professionally clipped delivery, the typos, etc. But I don’t know that anyone would mistake any of these for human-written copy now that we've become accustomed to the tropes contained therein. In fairness, I can’t imagine any LLM these days turns out prose quite as obnoxious as the example I provided, but I’m surprised some of the most prominent AI shibbolethsâ€"“It’s not [x]. It’s [y]†and the rule of three formulation involving three words that are largely synonymousâ€"remained unscathed. The real question, though, is whether this whole thing is, y’know, serious. I had some trouble getting the app to work, and eventually reached out to its developer, Dan Horwitz, a genial MBA student at Harvard. I put the same question to him, pointing out that while my initial assumption was that the app was going to be rather tongue-in-cheek, the website seems very serious about the idea. Horwitz laughs. “No,†he reassures me, “It is tongue-in-cheek.†The website is awfully deadpan, then. “Yeah,†he says. “The whole thing is meant to make people think twice and have a little fun. It’s closer to satire.†Of course, some of the best satire falls into the category of things that make you do a double-take and ask, wait, is this real? On that note, Sinceerly is a successâ€"but don’t be surprised if you see people using it for real. An AI correcting the mistakes of another AI to generate an email that’ll be read by another AI? It’s LLMs all the way down, kids.

New Browser Plugin Adds Typos to Your AI-Generated Emails to Make Them Look Real

Can't-miss innovations from the bleeding edge of science and tech The advent of large language model-based writing tools have given lazy or unconfident writers incredible new shortcuts that can spit out everything from glossy work emails to crispy school papers. The problem, of course, is that bosses and teachers around the world quickly got wise to the phenomenon -- and as a result, any text that feels too tidy and polished has started to arouse suspicion. Now, in an effort to reintroduce some of the messiness of human writing -- and hide our AI addiction -- venture capitalist Ben Horwitz used Anthropic's Claude AI to vibe code a browser plugin that does something that would have seemed preposterous just a few years ago: intentionally adding typos to emails. "I made the anti-Grammarly," he bragged, referring to a popular, AI-powered spelling and grammar checker. "Mess up your emails with AI." The cleverly named software, dubbed "Sinceerly," promises to wreak some controlled havoc on overly coiffed emails, from undoing capitalization at the beginning of a sentence to the introduction of glaring typos that would make any copy editor's eye twitch. (We'd advise against trying it out yourself until you get to the caveat at the end of this piece, though.) You can even choose the degree of severity for the errors, ranging from "Subtle," to "CEO," a tongue-in-cheek jab at high-ranking executives who are known for how little care they put into their communications. It'll even go as far as to append the phrase "sent from my iPhone." The browser plugin was inspired by our growing obsession with often-overbearing spellcheckers. "I am a terrible typist, naturally, and lightly dyslexic," Horwitz told Business Insider's Katie Notopoulos. "It would take me so long in my first job straight out of college to write emails and make sure there were no typos and everything." "When Grammarly came around, it was like, 'Oh, OK, this is pretty good for me.' But now my email inbox is filled with AI slop," he added. "I tested Sinceerly by cold emailing 5 Fortune 500 CEOs," Horwitz bragged in a Thursday tweet. "Four replied. Of those replies, each was under ten words. Two replies had typos." In Notopoulos' testing, the tool turned a polite email draft informing her boss that she's hoping "to have a sandwich for lunch today" into a messier "writing to confirm lunch plans" when shifted into "CEO" mode. However, in our own testing, the vibe-coded project appears to have succumbed to bugs after BI published its piece, with an error message rendering it largely useless. In other words, for now, you're stuck relying on your own human flaws for less AI-sounding work emails.

I never thought AI would add typos - but it kind of makes sense

"Anti-Grammarly" tool uses AI to make writing imperfect on purpose A new AI tool is flipping one of the oldest rules of digital communication on its head: perfect grammar is no longer the goal. Instead, the latest trend is to make emails look deliberately human - even if that means adding typos. When AI Starts Making You Sound Less Perfect According to a report by Fast Company, a new "anti-Grammarly" style tool created by Ben Horwitz has emerged that intentionally inserts mistakes into emails, making them appear less polished and more human. Horwitz is an investment partner at a venture capital firm called Dorm Room, and he comes from the Harvard Business School. The idea sounds counterintuitive at first. Tools like Grammarly were built to eliminate errors and improve clarity. But in the age of generative AI, flawless writing has started to carry a different implication - it often signals that a machine may have written it. Recommended Videos That shift has created a strange new dynamic. Instead of striving for perfection, users are now trying to simulate imperfection to maintain authenticity. Some tools even allow users to control the level of "human-ness," from subtle typos to more casual, informal writing styles. In other words, AI is now being used to hide the fact that AI was used in the first place. Why This Signals A Larger Change In Communication This trend reflects a deeper shift in how digital communication is perceived. For decades, clean grammar and structured writing were markers of professionalism. Now, that same polish can feel artificial. Recent discussions suggest that typos and informal writing are increasingly seen as signs of authenticity, even status. In some cases, overly perfect emails may be viewed with suspicion, as if they lack a human touch. That inversion is significant. It suggests that AI isn't just changing how we write - it's changing what "good writing" even means. The irony is hard to miss. We built AI tools to improve communication, and now we're building new ones to undo those improvements. Why It Matters To You As A User For everyday users, this shift could subtly change how emails are written and interpreted. If perfect grammar increasingly signals automation, you may find yourself adjusting your tone - intentionally or not - to appear more genuine. That could mean shorter sentences, casual phrasing, or even minor errors creeping into professional communication. At the same time, it raises questions about trust. If both polished and imperfect writing can be generated by AI, distinguishing between human and machine becomes even more difficult. What Comes Next In The AI Writing Evolution This "anti-perfection" trend is likely just the beginning. As AI writing tools become more advanced, the focus will shift from correctness to believability. Future tools may not just generate text, but adapt tone, style, and even mistakes based on context and audience. The goal will be to make communication feel natural, not flawless. That evolution could blur the line between human and machine even further. And perhaps that's the real takeaway. The future of writing isn't about eliminating errors - it's about deciding which ones to keep.

This 'anti-Grammarly' AI tool adds typos to your emails on purpose

From signing my emails with "bet" instead of "best" or sometimes writing "felt" instead of "left", living with dyslexia and choosing a career that requires me to write on the daily has turned typos into my biggest nightmare. After all, I've been taught that typos signal carelessness, unprofessionalism, or worse -- lack of talent altogether. But as AI makes life seemingly more perfect, tiny errors are also signatures of our humanity -- and that we put actual care into what we wrote instead of mindlessly relying on an LLM.