Does this email read like AI wrote it?

Paste the email and look. You get a probability for the whole message and for each paragraph, so you can see where it changes voice. Free, no account, nothing stored.

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Try a sample:

What you get back

One honest number, with its range

A plain sentence, a probability, and how wide our uncertainty is. We never round it up to a verdict.

Paragraph by paragraph

Every paragraph gets its own reading, so you can see where the text changes character.

The why, in plain words

Each reading says what it noticed, so you can judge for yourself. We explain; we never rewrite.

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Who this is for

Email is where AI writing tools are used most quietly. People ask a tool to make a message sound more professional, to soften a hard sentence or to write the whole thing from three bullet points. This page is for anyone who wants to know how an email reads before they send it, and for anyone who received one and wonders how much of it a person wrote.

You might be a manager reading a message that suddenly sounds nothing like its author, a freelancer checking that your client email still sounds like you after a grammar pass, or someone who received a long, warm note and wants a second opinion. Whatever the reason, you get a reading, not a judgement.

Polished with AI is not the same as written by AI

Most emails that score high were not written from nothing by a machine. They were written by a person and then smoothed by a tool. The result is often a mix: the practical lines about times, places and next steps read human, and a paragraph of thanks or praise reads like AI, full of “Furthermore” and “it is worth noting”. Our paragraph view is built for exactly this. Each paragraph gets its own reading, so you can see where the voice changes instead of getting one number for the whole message.

Try the sample “Email a person wrote, then polished with AI” in the checker above to see what that looks like.

What to paste

Paste the body of the email, from the greeting to the sign-off. Leave out long quoted replies underneath, signatures with addresses and legal disclaimers, because they are not the writing you want read. Keep the paragraph breaks.

Short texts and wide brackets

Emails are often short, and short texts are hard. Under 50 words we cannot read anything and will ask for more. Between 50 and 150 words we will give you a result, with a wide bracket and a line that says so. The bracket is how sure we are: when it spans half the scale, the number in the middle deserves very little weight. If you can, paste a longer thread of messages by the same writer, separated by blank lines, and read the paragraphs together.

How to read the result

Read the sentence first, then the number and its bracket, then the paragraphs. Select an amber paragraph to see the reasons, such as stock connective phrases or very even sentence lengths. These are things you can see yourself once they are pointed out. Corporate writing has them too, which is why the answer is always a probability.

Limits of the tool

The checker reads English only and needs at least 50 words. It does not know who sent the email, and it cannot tell how much a tool changed. It gives a probability, never proof, and it is never a reason on its own to accuse a colleague, a customer or anyone else.

Questions people ask

Can it tell an email AI wrote from one AI only polished?
Not with certainty. It can show you which paragraphs read like AI and which read like a person, which is often where a polished email gives itself away. It cannot tell you how much of a paragraph a tool changed.
Why is the bracket so wide on my short email?
Because short texts give the model very little to read. Under about 150 words we say so and draw a wide bracket. Longer text, steadier reading. Under 50 words we do not read it at all.
Is it safe to paste a work email?
The email is sent to our server, scored and discarded. It is not stored, logged or shared, and there is no account. Still, only paste what you are allowed to share, and remove names or details you would rather not send anywhere.
Should I tell a colleague their email was written by AI?
Not on the strength of a score. A result is a probability, and polished business writing scores higher whoever wrote it. If it matters, ask them in a friendly way, the way you would ask about anything else.