Benchmarking software is a data product wearing a software interface, and the interface matters far less than where the numbers come from. Two tools can price the same role several thousand apart, and neither is lying: they are sampling different employers, matching jobs differently, and reporting at different points in the distribution.
Where the numbers actually come from
Three sources, with different properties. Employer submitted survey data, which is accurate and lags because it is collected periodically. Payroll derived data from software vendors, which is current and skewed towards their own customer base. And scraped job advertisements, which are timely, plentiful and report what was advertised rather than what was paid. Knowing which you are buying explains most disagreements between tools.
Job matching is where the error enters
A benchmark is a comparison between your role and a defined one in the data. Matching by title alone is unreliable because titles are inconsistent between employers, and matching by description takes judgement. Products that show you the matched job description and let you adjust the match are more useful than ones that return a number from a title.
Reading the output honestly
Ask which percentile is being shown, what the sample size is for your job, location and sector, and how old the data is. A median from eleven employers in a different region is a weak basis for a pay decision and looks identical on screen to a robust one. Tools that suppress small samples are doing you a service even when it is inconvenient.
Questions people ask about compensation benchmarking software
Why do two benchmarks disagree?
Different sources, different job matches and different samples. Where they disagree widely, the sample size for your specific role is usually small in at least one.
How often should benchmarks be refreshed?
Annually for most roles and more often where the market is moving fast. What matters more is that the same source is used consistently so trends are real.
Can job advert data replace survey data?
For fast moving roles it is more current. It reports advertised ranges rather than actual pay, which is a systematic difference worth allowing for.