Google Ads has the opposite problem from Meta. Meta struggles to get credit for the sales it influences. Google tends to collect credit for sales it did not create, because it sits at the bottom of the funnel. Someone sees a TikTok, hears a podcast ad, or gets a recommendation from a friend, then searches your brand name and clicks a paid result. Google reports a conversion at a very high ROAS. I explained why its numbers run high in why Google Ads ROAS is higher than Meta ROAS.
Performance Max makes it harder, because it blends Shopping, Search, YouTube, Display, and branded queries into one campaign with limited visibility into which part produced the result. So tracking the impact of Google Ads mostly comes down to separating demand Google captured from demand Google created. Here are the tools that help with that.
Google Ads conversion tracking with enhanced conversions
Start by making Google’s own measurement as accurate as it can be. Enhanced conversions send hashed customer data from your checkout, like email address, so Google can match more conversions that cookies miss. It is free and it improves bidding. It does not fix the credit problem, since Google is still grading itself, but every other tool on this list works better when the platform’s optimization signal is clean.
GA4
GA4 is free and sees Google traffic in the context of every other source on your site, which makes it a reasonable second opinion on Google Ads. Its default data-driven model shares credit across touchpoints, and comparing it with last click shows how much of Google’s credit depends on being the final touch. The weaknesses are well known. It undercounts Shopify orders, it was not built around ad spend or new-customer cost, and most operators do not trust it for budget decisions. I compared it with attribution tools in ThoughtMetric vs GA4.
Northbeam
Northbeam is the strongest option for brands with large Google budgets across Search, Shopping, and YouTube. Its view-aware modeling gives YouTube and other upper-funnel placements credit that click-based tools miss, which is useful when you are trying to judge whether YouTube spend inside Performance Max is doing anything. Starter is listed from $1,500 a month, which limits it to brands where Google spend is large enough to justify it.
ThoughtMetric
ThoughtMetric reports Google campaigns next to every other channel under multi-touch attribution, with new-customer ROAS and cost per new-customer order by campaign. (Disclosure: ThoughtMetric sponsors this site.) The new-customer split is the useful part for Google, because branded search and Shopping campaigns often show excellent ROAS made almost entirely of returning customers. It also sends conversion data back to Google and Meta, and folds post-purchase survey answers into attribution. Pricing starts at $99 a month for 50,000 pageviews with every feature included and a 14-day trial. It does not model view-through conversions the way Northbeam does, which matters if YouTube is a large share of your Google budget.
Triple Whale
Triple Whale gives you an independent Google view on its free plan, with the Triple Pixel and first and last click attribution. Comparing first click against last click for your Google campaigns is a quick way to see how often Google is the closer rather than the opener. Multi-touch attribution starts on Foundation, listed at $219 a month on its Shopify listing, scaling with GMV on a 12-month subscription.
Meridian
Google’s open-source media mix model, Meridian, is free to use and estimates channel contribution from spend and sales over time rather than tracking individual clicks. It needs a couple of years of clean weekly data and someone comfortable with statistical modeling, so it is out of reach for most brands under $10M. Where it fits, it is the best check on whether your Google spend is incremental at the level of the whole business.
The test that settles it
Tools narrow the question. A test answers it. The cleanest Google test for most brands is pausing branded search for two weeks in a few regions, or for the whole account if you have little competitor bidding, and watching total revenue, not Google revenue. I wrote up how to do it in brand search is the easiest thing to test. Most brands find a share of branded revenue moves to organic, which tells you what that line item really bought.
For Performance Max specifically, split out branded traffic where you can and judge the campaign on new-customer CAC in your own attribution rather than Google’s ROAS. More detail in do attribution tools work with Google Performance Max?.
Picking tools
- Everyone: set up enhanced conversions first.
- Want a free second opinion? GA4, or Triple Whale’s free plan comparing first and last click.
- Large Google budget with heavy YouTube? Northbeam.
- Want new-customer cost by Google campaign next to every other channel? ThoughtMetric (our sponsor).
- Years of weekly data and an analyst? Meridian.
- Want an actual answer on branded search? Run the pause test.
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