See the true impact of your ads
Marketers have been misled for years by attribution models that confuse correlation with causation. Stella’s Incrementality Testing isolates the real impact of your campaigns by answering the question: “What would have happened if we didn’t run this?” With scientifically valid holdouts and causal inference modeling, you see the revenue your ads truly create, not just the clicks they collect.
Results you can trust, backed by science
Not every test is worth trusting. That’s why Stella enforces strict standards for statistical validity, using metrics like MAPE, R², and confidence intervals to ensure your results are real. Every study is backed by frameworks reviewed with PhD data scientists, so you can act with confidence knowing your marketing decisions are grounded in science, not guesswork.
Easy to run, simple to understand
Incrementality testing used to require teams of analysts and weeks of work. Stella makes it simple: upload a CSV or Google Sheet, run our Location Selection Tool to find the strongest test regions, and launch your first holdout in minutes. Complex models are automated in the background, while Stella translates results into clear insights any marketer can use.
Enterprise accuracy, at an accessible price
Getting answers shouldn’t cost six figures or months of spend. Stella’s minimum investment thresholds are 2x lower than most alternatives, making high-quality testing accessible for brands of all sizes. With affordable, repeatable studies, you can measure, learn, and optimize continuously, without compromising on statistical rigor .
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