Is That Message AI? 7 Dead Giveaways to Spot AI-Written Texts

You got a message. Something felt... off. Too polished. Too complete. Too emotionally distant despite the warm words. You're now asking yourself: is this message AI? You're not alone — and your gut might be right.

AI-generated messages are showing up everywhere now. Dating apps. Work emails. Even texts from people who swear they wrote every word themselves. Here are 7 concrete signs the message in your inbox wasn't actually written by a human.

1. The Spelling and Grammar Are Suspiciously Perfect

Real people make tiny mistakes. They type "teh" instead of "the." They skip a comma. They use fragments because that's just how people talk. If a message reads like it passed through a spell-checker, a grammar checker, and a style guide all at once — that's a red flag. AI models produce clean, error-free output by default, and that strange "perfection" is often the first thing to notice.

2. The Tone Doesn't Match Their Usual Style

If your colleague suddenly emails you with "I hope this message finds you well" when they usually say "hey quick q —" something changed. A sudden shift in formality or vocabulary is one of the clearest human-intuition signals. Compare it to older messages from that same person — if the voice sounds like a completely different person, it probably was.

3. It Answers Questions You Didn't Ask

AI over-explains. It anticipates objections, covers multiple scenarios, and wraps up with a polite offer to help further. Humans answer what was asked and stop. If you said "are you free Thursday?" and got a paragraph covering Thursday, Friday, and "any other time that works for you" — that structure is very AI. The dead giveaway is unnecessary completeness, unprompted.

4. The Emotional Language Feels Generic

"I completely understand how frustrating this must be for you" is technically warm. It also sounds like a customer service script. Real emotional responses are messier — they reference specific details, they get the tone slightly wrong, they trail off mid-thought. If the compassion in a message could apply to literally anyone in any situation, it probably came from a model with no idea who you actually are.

5. It Has a Weirdly Consistent Structure

Intro sentence. Three supporting points. Closing line. Humans don't write casual messages that way. If a text has the skeleton of a well-structured essay, something built it intentionally. Understanding how AI detectors work makes this pattern obvious — they flag exactly this kind of structural regularity as a core signal of machine-generated text.

6. You Can Just Test It

This is the most direct answer to "is this message AI" — run the text through a detector. WriteMask's free AI detector analyzes any block of text and returns a probability score in seconds. Paste the message in, hit analyze, done. Worth noting: AI detection false positives are real, especially for short texts under 100 words. But a high confidence score on a longer message is hard to ignore.

7. It Lacks Inside References or Shared Context

Someone who actually knows you writes differently than a language model. They reference the thing you talked about last week. They drop an in-joke. They spell your nickname the weird way you prefer. AI has zero memory of your relationship, so AI-written messages tend to be context-free and oddly impersonal even when they're trying hard to be warm. If the message could've been sent to anyone and made perfect sense — that's the final tell.

What to Do When You Think a Message Is AI

Run it through a detector first. WriteMask's free AI detector is a fast, no-login check that gives you a concrete number to work with. From there, compare it against older messages from that person, look for the patterns above, or just ask them directly — most people will be honest when confronted calmly.

If you're on the other side of this — worried that your own AI-assisted writing sounds robotic and might get flagged — try WriteMask, which carries a 93% pass rate at making AI-written text sound natural and human. You can also test how sharp your own instincts are with the AI or Human? game. Spoiler: it's a lot harder than you'd expect.