AI writing checker for coaches: find the fifteen tells before you post.
Paste a caption, an email or a check-in reply. The page scores it from 0 to 10 for the fifteen habits that AI drafts share, highlights every hit in your text, shows the fix from our guide beside it, and writes the rewrite prompt with your draft already inserted. It is not a detector: it cannot tell who wrote the text, only whether it reads like everyone else's. Nothing you paste leaves your browser.
By Markus Evers · Updated September 2026
check a draft
0 words · 0 sentences
reads like AI
0/10
paste a draft
A high score means rewrite, not "written by AI".
your draft, hits highlighted
what it found, with the fix
No tells found. Read it aloud once; if it sounds like you, post it.
Scoring: each tell counts one point (contrast framing counts two, three or more banned words count two), the total is scaled to 0 to 10. Zero to two: post it. Three to five: one rewrite pass. Six and up: rewrite from your own first sentence. Nothing you type leaves this page.
This AI writing checker counts fifteen habits that AI drafts share, from contrast framing to the closing offer line, scores the draft from 0 to 10, and shows the fix beside every hit. It runs in your browser and sends nothing anywhere. A high score means rewrite before you post, never "written by AI": it checks habits, not authorship.
How does this AI writing checker work?
It counts fifteen habits that AI drafts share, explains each hit, and never sends your text anywhere; a high score means "rewrite", not "written by AI". Each habit is a rule you could apply by hand: a pattern match for contrast framing and the closing offer line, a word list for the banned words, a count for question stacks and exclamation stacks, a standard deviation for uniform sentence length, and two absences (no digits, no first person) that mark a draft nobody in particular wrote. The rules come from a 770-point r/ChatGPT thread on the formats readers can no longer stand and from the fifteen tells in how to make ChatGPT not sound like AI, where each one has a before and an after.
What are the 15 tells?
Fifteen habits, each with an example and the fix the checker shows when it finds one. Thirteen are things the text does; the last two are things it fails to do, and they catch the drafts that pass every other rule while still sounding like nobody.
| Tell | Example | Fix |
|---|---|---|
| 1. Contrast framing | "It's not about the weight. It's about the habit." | Say the second half only, with a number: "Her deadlift went from 60 to 80 kg in eleven weeks." |
| 2. "You don't need X, you need Y" | "You don't need motivation, you need a system." | Name the system: "Two sessions, Tuesday and Friday, booked a month ahead." |
| 3. Question stacks | "Tired of plateaus? Frustrated with slow progress? Ready for change?" | One statement with the detail: "Three flat weeks with good adherence is a signal. Here is what I changed." |
| 4. Runs of one-line paragraphs | Four or more single-sentence paragraphs in a row, each with its own line break. | Let two sentences share a paragraph when they belong together. |
| 5. The banned words | elevate, unlock, journey, game-changer, empower, transform, dive in, unleash, seamless, in today's, whether you're, let's be honest, delve, testament, harness | Replace each with the plain verb or delete the sentence; most of them carry no fact. |
| 6. Groups of three | "Stronger, leaner, more confident." | "Stronger. That was the goal." |
| 7. The closing offer line | "If you'd like, I can put together a plan for you." | Delete it. End on the detail or the one ask you already made. |
| 8. The summary sentence at the end | "In short, consistency and patience are the keys to success." | Cut it. Last line is the client's words or your one ask. |
| 9. "And honestly?" and its cousins | "And honestly? Here's the thing. The truth is..." | Say the thing. The wind-up is the tell. |
| 10. Uniform sentence length | Every sentence 14 to 18 words, all the way down. | One long sentence, then a three-word one. Read it aloud and keep the rhythm you hear. |
| 11. Em and en dashes | A long typed dash between two clauses where a comma or a full stop would do. | A full stop, a comma or a colon. Coaches rarely type a dash by hand. |
| 12. Exclamation stacks | "Let's go! You've got this! Amazing work!" | None, or one, and only if you use them in speech. |
| 13. Generic praise openers | "Great question! I love your dedication." | "Fair question. The answer was yes." |
| 14. No digits anywhere | Two hundred words without a single number. | One real number from your week: a weight, a date, a count of check-ins. |
| 15. No first-person detail | No "I", "my" or "we" in a post that is supposed to be from you. | One sentence that could only be yours: what you did, saw or changed this week. |
Why not use an AI detector?
Because detectors guess who wrote a text and get humans wrong, and a coach does not need to know who wrote the draft; a coach needs to know whether a follower will keep reading. A 111-point r/ChatGPT thread is a writer who enjoys being mistaken for a model; the r/copywriting threads on constant AI accusations and on readers disregarding anything that looks generated are the two costs of guessing: a human accused, and a real post scrolled past. This checker takes no position on authorship. It counts habits you can fix in a minute, which is the only question that changes what you post.
What do I do with a high score?
Run the 60-second pass: read the draft aloud, cut the first sentence if it is a warm-up, replace every flagged line with the fix beside it or with a number from your week, keep one detail only you could know, and make sure the last line is the ask or the detail rather than a summary. If the score is six or more, the faster route is to copy the rewrite prompt above, paste three things you wrote where it asks, and let the model rewrite the draft to your rhythm; then run the result through the checker again. The pass, the two prompts and the fifteen before-and-afters are in how to make ChatGPT not sound like AI; the caption-specific rules with ten rewrites are in Instagram captions that don't sound like AI.
Rewrite only the flagged lines in my voice
The generator gives you the structure; your voice is the part it cannot know. Paste the flagged lines and three posts you wrote yourself into the prompt below and the model keeps the structure, rewrites the wording the way you write, and removes the tells listed in how to write captions that do not sound like AI. How to write prompts like this one for your own coaching work is in prompt engineering for fitness coaches.
Rewrite only the flagged lines in my voice
When to use it: After the checker has flagged the tells in a draft.
What to paste in: The flagged lines, the score, and three posts you wrote yourself.
You are fixing a fitness coach's draft so it sounds like the coach. Below are three posts I wrote myself; learn my voice from them and use nothing else as a style source. Then rewrite ONLY the flagged lines from my draft; leave every other line exactly as it is and return the whole draft. My posts: [PASTE THREE OF YOUR OWN POSTS] My draft, with the flagged lines marked >>: [PASTE THE DRAFT WITH THE CHECKER'S FLAGGED LINES MARKED] Remove these AI tells: em dashes, groups of three, "it is not X, it is Y", hedging openers such as "Let us be honest", and any line that sounds like a caption template. Keep my sentence length, my words for the client and my way of ending a post. Output one version only, no options, no explanation. If you cannot tell who the post is for from my samples, ask me one question before you rewrite.
Where do the final messages live?
In the places a client reads them: the check-in reply, the welcome email, the message after a missed session. Those are the drafts worth checking first, because a follower forgives a generic caption and a client does not forgive a generic reply. Write the caption with the Instagram caption generator and check it here; draft the reply with the check-in reply prompts and check it here. In Coachway the check-in form, the reply and the client's history sit on one screen, so the specific detail the checker keeps asking for is already in front of you when you write. The words stay yours, written wherever you write them.
Frequently asked questions.
Is this an AI detector?
No. It counts fifteen writing habits that AI drafts share and explains each one with a fix. It says nothing about who wrote the text: a human first draft can score high (many do) and an edited AI draft can score low. A high score means "rewrite before you post", never "written by a machine".
Does it send my text to a server?
No. Everything runs in your browser; nothing you paste is sent, stored or logged, which is why you can paste a check-in reply with a client's first name in it. Only what you copy leaves the page, and the copy button puts the text into your own clipboard.
Why does my own writing score high?
Because the habits are habits, not fingerprints. Writers picked up contrast framing, tricolons and the summary sentence long before models did, and models learned them from us; the r/copywriting threads on being accused of using AI exist for exactly this reason. Treat the score as an edit list. If a flagged line is something you would say out loud to a client, keep it and ignore the point.
What words make writing sound like AI?
The ones that carry no fact: elevate, unlock, journey, game-changer, empower, transform, dive in, unleash, seamless, delve, testament, harness, and the phrases "in today's fast-paced world", "whether you're a beginner or", "let's be honest" and "it's important to note". The checker flags each occurrence; the fix is nearly always to replace the sentence with a number or a specific.
Can I use it for emails and check-ins?
Yes, and that is where it matters most, because a client reads a check-in reply more carefully than a follower reads a caption. The rules are the same for a caption, a welcome email, a testimonial request or a check-in reply; the rewrite prompt it exports carries the same rules and asks for three things you wrote so the model copies your rhythm.
Does it rewrite the text?
No. Rewriting it here would make this an AI product, and the point is that the final words are yours. It highlights each hit, shows the fix, and offers a copy button for the rewrite prompt from our guide with your text already inserted, so you can run it in ChatGPT, Claude or Gemini with your own samples for voice.
Can ChatGPT rewrite the flagged lines in my voice?
Yes, and only those lines, if you tell it to. Paste three posts you wrote yourself, then the draft with the flagged lines marked, into the prompt above; it rewrites the marked lines in your sentence length and your words and returns the whole draft unchanged elsewhere. Run the result through the checker again: a rewrite that drops from a high score to a low one without losing the point is the goal, not a zero.
Keep going: the thirty prompts for the coaching side in ChatGPT prompts for online fitness coaches, the voice-profile method that stops the tells at the source in how to train ChatGPT on your coaching voice, the first two seconds of the reel with the Instagram hook generator, and every prompt on this site in the free AI prompt pack for online coaches.
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