What is an AI tone detector?
An AI tone detector reads a piece of writing and tells you how it is likely to come across to the person receiving it. Paste an email, a chat message, a post or an article and a language model reports six things: the primary tone, the sentiment with a confidence level, formality on a scale of 1 to 10, the emotional undertones, how a reader is likely to feel, and specific suggestions that quote the phrases worth changing.
It exists because tone is hard to judge in your own writing. You know what you meant, so you read your intent rather than your words. The sample on the page shows the problem: "Per my last email, the report was due Friday. I'd appreciate it if we could avoid this happening again." The writer may think it is firm but polite. Most readers hear irritation, and the detector should point at "Per my last email" as the phrase doing the damage.
The analysis runs on the Toolz server. Your message is sent over HTTPS, the server builds the prompt and runs Gemma 3 1B, a small open model from Google, with Ollama, and the report streams back within a few seconds. That matters here, because the messages people want checked are often the sensitive ones: a complaint, a reply to a manager, a breakup text. The text is used to write the report and then discarded: it is not stored or logged, not used to train any model, and not sent to any third-party AI company.
Treat the result as a second opinion, not a verdict. Tone depends on the relationship and the context the model cannot see, sarcasm is easy to misread, and the confidence level is the model's own estimate rather than a measured statistic. A 1B model can also over-read neutral text as negative. Where the stakes are high, ask a person you trust.
It is free with no signup, within about 20 checks per 10 minutes. The alternatives are reading the message aloud, waiting an hour before sending, or asking a colleague. This tool is quicker than all three, and it names the exact words to soften, which you can then reword with the paraphraser.
How to check the tone of a message
Paste the text
An email, a Slack or text message, a review reply or a post. Include the whole message, since tone often builds across sentences.
Press Detect tone
The analysis streams in as it is written, usually within a few seconds.
Read the six parts
Primary tone, sentiment, formality score, undertones, the likely reader reaction, and suggestions that quote the phrases to change.
Adjust and recheck
Edit the flagged phrases, paste the new version and run it again to see whether the tone moved where you wanted. Copy or download the report as .txt.
What the tone detector reports
Primary tone and undertones
Names the main tone, such as professional, friendly, angry or sarcastic, plus the quieter emotions under it.
Sentiment with confidence
Positive, negative or neutral, with how sure the model is. Useful for spotting a message that reads colder than intended.
Formality from 1 to 10
A quick scale for checking whether a message suits a client, a manager or a friend.
Phrase-level suggestions
Quotes the words creating the tone and suggests what to change, so you know exactly where to edit.
Frequently Asked Questions
Related Tools
AI Email Writer
Write a follow-up, request, thank-you, apology or meeting email in five tones, subject line included. Free, no signup, and what you type is not stored.
AI Grammar Checker
Find grammar, spelling and punctuation errors in American, British, Australian or Canadian English, with a reason for each fix and a corrected copy. Free, and your text is not stored.
AI Paraphraser
Reword any text in six tones while keeping names and numbers intact. Free, no signup, and your text is not stored.
AI Readability Checker
Get an estimated reading grade level, the hardest sentences, jargon with plainer alternatives and a simplified rewrite for your intended reader. Free, and your text is not stored.
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