Prospective customers encountering the offer for the first time
Ground the study in customer evidence relevant to this decision.
Sunzu for copywriters
You know what you mean.
Find out what they hear.
A headline has one job. Make sure your audience gets it. Compare messages, explore what sounds credible and find the questions your copy still leaves unanswered.
Used by
- Insights analysts
- Product managers
- UX designers
- Marketing strategists
- Copywriters
- Go-to-market leads
- Growth managers
Trusted by
Backed by
- Microsoft for Startups
- NatWest Accelerator
The work in front of you
Keep your voice. Understand their reading.
Use audience reactions to guide the edit, whether you are writing a landing-page proposition, a campaign headline or a product message.
- Concept testing
Test the promise before polishing the line
Compare message concepts to see which benefit your audience understands and which wording introduces ambiguity.
Explore concept testing - Depth interviews
Find the objection the copy needs to answer
Use depth interviews to explore concerns, expectations and the language your audience uses.
Explore depth interviews - Ad testing
Check the message in the creative
Use ad testing to examine how the copy and visual work together before a campaign goes live.
Explore ad testing
Your next study
Which message makes the value clear?
Bring a real question. We’ll scope the audience, evidence and study together.
Start with what you have
Headline alternatives
Offer and context
Customer language
From research to a decision
A revision brief that goes beyond “make it punchier”
Keep the question, the evidence and the next action connected.
Ask
Does ‘always protected’ communicate the benefit, or leave people unsure what is covered?
Examine
Examine what the audience thinks the promise includes. Look for missing context, doubtful claims and language that needs explanation.
Act
Write a more specific version, compare reactions and take the strongest candidate into a live test.
Illustrative research brief. This is an example of how to use findings, not a completed customer study or a product screenshot.
Internal back-testing
Ad testing. Measured against a human reference.
Sunzuin minutes69%
Human expert with AIin days55%
Research, 500+ humansin months100%
Sunzu internal back-testing. Research, 500+ humans is the reference set to 100%. This is a study-specific comparison, not an overall accuracy score or a guarantee for your study.
From our customers
Relied on by global experts
Director, Consumer Insights & Strategy
In just a couple of months, over 170 of our colleagues have run over 500 studies.
We’re now directly integrating audiences into many of our research, product and marketing workflows.
Director, Global Product and Design UX Research
In a market flooded with AI-generated noise, this was the first platform that genuinely earned our trust.
By grounding its models in research principles, behavioural science, and real customer data, it delivers insights that feel credible, transparent, and actionable.
It changed our perspective on what’s possible with AI in customer research.
A few useful answers
Before your first study.
The workflow here is research: explore motivations, compare message concepts and examine reactions to adverts. You use the findings to make the editorial decision.
Sunzu helps you examine understanding, appeal and objections. A live experiment is needed to measure conversion and determine a winner in your actual traffic.
Sunzu creates audience characters grounded in customer evidence and enriched with a behavioural corpus. They are simulations. Use findings to explore directions and sharpen questions; lived experience, unexpected behaviour and consequential decisions still need research with real people.