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Undertone

AI sentiment analysis that understands context

Read the feeling behind every word.

Paste a review, a support ticket or a social post. Undertone scores the sentiment, maps eight emotions and shows exactly which phrases tipped the balance.

  • No sign-up needed
  • Your text is never saved
  • Results in seconds
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  • Overall mood

    A score from minus one to plus one, a clear label and how confident the read is.

  • Emotion map

    Joy, trust, anticipation, surprise, sadness, fear, anger and disgust, each measured.

  • Sentence flow

    Where the mood rises and dips, with every sentence scored and highlighted.

  • Topics and phrases

    What gets praised, what gets criticized, and the exact words behind it.

What you get

More than good or bad.

Every analysis explains itself, so you can see why a customer feels the way they do, not just that they do.

A clear verdict, with the reasoning

Each result comes with a label, a score from minus one to plus one, a confidence level and a plain-language summary of what drives it.

Eight emotions, measured

Joy, trust, anticipation, surprise, sadness, fear, anger and disgust. Know whether an unhappy customer is disappointed or furious.

Sentence by sentence

See where the mood rises and dips. Every sentence is scored and highlighted, and the phrases that matter are underlined.

Topics people judge

Undertone pulls out what people evaluate, like delivery, price or staff, and how they feel about each one.

Context, not keyword counting

Deep AI analysis follows negation, contrast, sarcasm, slang and emoji, and reads text in many languages.

Bulk analysis with CSV export

Paste a list or upload a spreadsheet of up to 50 entries. Get the overall mood, recurring themes and a results file to download.

Open bulk analysis

How it works

From raw text to a clear read in three steps.

No setup, no account and nothing to install. It works right here in your browser.

  1. 1

    Paste or upload

    Drop in a single review or message, or bring a list or spreadsheet of up to 50 entries at once.

  2. 2

    Undertone reads it

    Every sentence is scored for sentiment and emotion, with negation, contrast and emphasis taken into account.

  3. 3

    Act on what you learn

    Copy the report, download the results as a spreadsheet and fix the things people keep bringing up.

Use cases

Wherever people tell you how they feel.

Reviews, tickets, comments and survey answers all carry a mood. Undertone makes it measurable, so you can respond to it.

  • Product reviews

    Find out which features win praise and which ones lead to returns and refunds.

  • Customer support

    Spot frustrated customers early and pick out the urgent tickets before they escalate.

  • Social media

    Follow how people talk about your brand, a launch or a campaign as it happens.

  • Surveys and NPS

    Turn open-ended answers into a clear picture of satisfaction and the reasons behind it.

  • Hospitality

    Learn what guests love about their stay at your hotel or restaurant, and what spoils it.

  • Your own writing

    Check how an email, a post or an announcement comes across before you hit send.

Bulk analysis

Got a spreadsheet full of feedback?

Analyze up to 50 reviews, comments or survey answers in one go and get the full picture in under a minute.

Try bulk analysis
  • Upload a CSV or text file, or paste one entry per line
  • See the overall mood and the themes that keep coming up
  • Download every result as a spreadsheet-ready CSV

FAQ

Questions, answered.

Everything you need to know about how Undertone reads your text.