There are more than forty time-tracking tools on the Spanish market and almost all of them promise the same thing on their homepage. The difference isn't visible on the home page: it's visible the day the Labor Inspectorate arrives, the month you hire fifteen seasonal workers at once, or the morning a manager tries to coordinate shifts from their mobile phone and can't. This guide does not recommend brands. It provides the eight criteria with which to separate what works from what just has good marketing.