Brand Lift Tests vs Incrementality Testing
In short: Both compare an exposed group to a randomized control, but they measure different outcomes entirely. Brand lift tests survey people about what they remember or think, producing a percentage-point gap in recall, awareness, or consideration. Conversion-focused incrementality testing tracks actual behavior, comparing conversion rates between exposed and held-out groups. A brand lift result tells you the ad registered; an incrementality result tells you the ad caused someone to act. Use brand lift testing for awareness campaigns with no expected purchase in-window, and conversion-focused incrementality testing whenever you need a revenue or conversion answer.
By the AdFlint research team · Fact-checked against current Google and Meta platform behavior · Last reviewed July 2026
Brand Lift Tests
Surveys exposed and control users to measure shifts in ad recall, awareness, or consideration rather than clicks and conversions.
The platform polls a randomized holdout alongside people who saw the campaign, then reports the percentage-point difference in survey responses. It is the standard read for video and awareness work where no purchase is expected inside the window. Minimum spend and reach thresholds usually apply. The misuse is treating a recall lift as a revenue result; it evidences memory, not demand, and needs pairing with a conversion or geo test.
Full definitionIncrementality Testing
Measures how many conversions the advertising actually caused by comparing an exposed group against a randomized control that saw nothing.
You withhold ads from a randomly chosen slice of the eligible audience or market, then read the difference in outcomes between exposed and held-out groups. It answers the question attribution cannot: how much of this would have happened anyway. Advertisers run it on brand search, retargeting, and any channel with suspiciously good reported returns. The mistake is running it too small or too briefly to detect a realistic lift.
Full definitionSide by side.
The differences that actually change what happens in your account.
| Brand Lift Tests | Incrementality Testing | |
|---|---|---|
| What gets measured | Survey answers about recall, awareness, or consideration. | Actual conversion events - purchases, signups, or whatever action you are tracking. |
| Data source | A sampled survey fielded to exposed and control users after exposure. | Conversion tracking already flowing through your pixel, platform, or CRM. |
| Fits campaigns with | No expected purchase inside the flight, like a video or awareness push. | A trackable conversion event expected inside a realistic window. |
| What a positive result means | More exposed people remembered or considered the brand than the control did. | More exposed people converted than the control would have without exposure - a demand result, not just a memory one. |
| Converts into ROAS or CPA | No - a percentage-point survey gap does not translate into a cost-per-result figure. | Yes - the conversion gap between groups can be turned into an incremental cost per conversion. |
| Access requirements | Reach and spend thresholds tied to getting enough survey responses. | Enough audience and conversion volume in both groups to detect a realistic lift, which varies by method. |
| Typical trigger for running it | Launching an awareness or video campaign and wanting proof it is being noticed. | Reported conversion numbers on a channel look too good, or a budget decision needs a causal answer. |
What actually separates them.
Brand lift testing reads survey responses about memory and opinion; conversion-focused incrementality testing reads actual tracked conversion behavior.
A brand lift result is a percentage-point gap that cannot be converted into a cost-per-result figure; an incrementality result can, since it is measured in the same conversion units your account already reports.
Brand lift testing works on campaigns with no purchase expected in the flight; incrementality testing needs a trackable conversion inside a realistic window to produce a usable number.
Brand lift testing is fielded through a survey instrument the platform manages; incrementality testing typically reuses conversion tracking you already have in place.
A strong brand lift result does not guarantee incremental conversions will follow, and a strong incrementality result does not require any measurable shift in stated recall, so a campaign can pass one and fail the other.
Which one should you use?
Use Brand Lift Tests when
- You are running video or awareness media where no purchase is expected during the flight.
- Someone needs evidence the creative is registering with the target audience before a lower-funnel campaign launches.
- You have the reach and spend to clear the platform's survey sample minimums.
- You want a read on memory and consideration specifically, not conversions.
Use Incrementality Testing when
- You need a number that converts into a cost-per-conversion or revenue figure.
- Reported conversions on a channel look implausibly good and need a causal check.
- Your campaign has a trackable conversion event happening inside a realistic window.
- A budget decision needs proof of actual behavior change, not just awareness.
Common questions.
If my brand lift score is high, does that mean the campaign is incremental?
Not necessarily - a brand lift test only shows more exposed people remembered or considered the brand than the control, which is a memory result, not a purchase result. Pairing it with a conversion-focused incrementality test is the only way to know if that recall turned into actual demand.
Can I run both tests on the same campaign?
Yes, and it is common for awareness campaigns that eventually feed a conversion funnel - the brand lift test checks whether the creative is being noticed, while a separate incrementality read checks whether that exposure is producing conversions downstream. They use different instruments, so running one does not interfere with the other.
Why does my incrementality test show no lift even though brand lift was positive?
That gap is common and not a contradiction - a brand lift test measures whether people noticed and remembered the ad, while an incrementality test measures whether they actually converted, and plenty of memorable campaigns do not move purchase behavior inside the measured window. Treat the two as separate questions rather than expecting one to predict the other.
Do I need a survey vendor to run a brand lift test?
No, the major ad platforms field the survey themselves as part of the product, sampling exposed and control users directly through their own tools. What you need instead is enough reach and spend to clear the platform's minimum thresholds for a statistically usable sample.
Or stop choosing between them.
AdFlint picks the setting, writes the ads, and keeps optimizing inside the Google and Meta accounts you already own.
Related comparisons
- A/B Testing vs Incrementality Testing
- A/B Testing vs Conversion Lift Tests
- A/B Testing vs Brand Lift Tests
- A/B Testing vs Geo Testing
- A/B Testing vs Holdout Testing
- A/B Testing vs Marketing Mix Modeling
- A/B Testing vs Multi-Touch Attribution
- Conversion Lift Tests vs Incrementality Testing