System1 Launches Test Your Ad Screen, Trained on 18 Million Human Reactions
System1 has launched Test Your Ad Screen, an AI tool that screens up to 100 finished long-form ads at a time and returns effectiveness predictions in minutes — trained on 18 million real human emotional responses rather than synthetic data.
An AI screener built on human emotion, not synthetic data
System1, the creative effectiveness platform, has launched Test Your Ad Screen, an AI screening tool trained on 18 million human emotional responses. It is built to let marketers screen up to 100 finished long-form creative assets at a time and get effectiveness predictions back in minutes, giving brands a faster read on which assets are worth putting money behind.
Underneath it sits Test Your Ad Competitive Edge, System1's database of human emotional norms, built from millions of real consumer responses. That is the distinction the company is pressing: the predictions are modelled on an empirical record of how people actually felt about advertising, and what those feelings went on to predict for long-term brand growth, sales and profit — not on synthetic data or assumptions.
Bands, not decimals — and it stays quiet when it isn't sure
Results come back as low, medium and high ranges across the key diagnostics rather than precise decimal figures. The bands give a directional, honest read on where an asset's commercial impact is likely to land relative to category and emotional norms.
System1 says those outputs match human testing nine times out of ten, and that the tool will withhold a result altogether when it is not confident in its own prediction. That second point matters more than it sounds. A screening tool willing to say nothing is considerably more useful than one that always produces a number.
Screen wide first, then test deep
The launch completes a two-stage creative effectiveness journey for System1 clients. Screen casts a wide net across a brand's long-form assets and surfaces the strongest options in minutes, helping marketers decide where to put media budget and which assets justify deeper human research.
Anything needing more scrutiny then goes to Test Your Ad, which tests with real consumers and custom audiences to deliver exact figures and qualitative insight. Test Your Ad Screen is available now through System1's online platform in the US and UK for long-form assets, with further markets and media channels to follow.
AI plus human understanding, not AI instead of it
Andrew Tindall, Chief Growth Officer, Advertising at System1, framed the problem as one of volume: “Marketing teams today are faced with delivering an ever-increasing number of creative assets. Test Your Ad Screen helps them make more decisions faster and more regularly, with accurate and predictive data in minutes. This enables brands to understand creative quality and make better informed decisions about where media spend should be allocated.”
CEO James Gregory was careful to position it as an addition rather than a substitution: “We believe the future of creative effectiveness lies in combining AI with real human understanding. Test Your Ad Screen is built on millions of real human emotional responses, not synthetic data or assumptions, helping marketers screen creative quickly while staying grounded in how people actually feel. This is not a replacement for human testing, but a complement to it, and an important next step for System1 in bringing AI and human emotion together.”
Marketing Minute's read: the moat is the dataset
Our take: every research business is shipping an AI layer this year. What separates them is not the model, it is what the model learned from. System1's argument is that 18 million recorded human emotional responses, tied to real commercial outcomes over two decades, are the part nobody can shortcut. The AI is the interface; the dataset is the product.
The banded output is shrewd commercially as well as intellectually. By refusing false precision, System1 protects the credibility of its full-fat human testing while still giving clients something genuinely useful for high-volume decisions. Screen does not cannibalise Test Your Ad. It feeds it.
What businesses should take from it
Most brands now produce far more creative than they can afford to test properly, so the majority of assets go live on instinct. A cheap, fast triage layer that flags which assets are probably weak is worth more in practice than a perfect score on the two ads you had the budget to research.
The wider principle travels well beyond ad testing: decide deliberately what deserves a quick directional read and what deserves rigour, and stop spending the same effort on both. Most marketing teams do the opposite by default.
Quick FAQ
What is Test Your Ad Screen?
It is System1's AI creative screening tool. It screens up to 100 finished long-form creative assets at a time and returns effectiveness predictions in minutes, trained on 18 million human emotional responses.
How accurate is it?
System1 says the predictions match human testing nine times out of ten. Results are reported as low, medium and high bands rather than exact figures, and the tool withholds a result when it lacks confidence in its accuracy.
Does it replace human ad testing?
No. System1 positions it as a complement. Screen narrows a large pool of assets quickly, then Test Your Ad uses real consumers and custom audiences for precise diagnostics and qualitative insight.
The interesting part here isn't the AI, it's the 18 million human reactions sitting behind it. Anyone can bolt a model onto ad testing; almost nobody else has two decades of recorded emotional response tied to real commercial outcomes. And reporting in bands rather than decimals is System1 being honest about what a fast screen can and cannot tell you — which is rarer in adtech than it should be. — Daniel Nikolla, Founder of Merx Marketing Ltd and Marketing Minute
When everyone has the same models, the advantage sits in the data nobody else can rebuild.
How much of your creative output ever gets tested before the media money goes behind it?
If you would like to know more about this topic, please contact us on danieln@merxmarketing.co.uk
Sources: System1 (system1group.com).
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Written by Daniel Nikolla, Founder of Merx Marketing Ltd and Marketing Minute
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