Free, no sign-up, nothing stored. Each one does a single piece of arithmetic that a label makes harder than it needs to be.
Pick an ingredient, type the amount printed on your label, and see how it compares to the amount used in published human trials.
Every ingredient has a maximum as well as a minimum, so it tells you when a number is too high and not only when it is too low.
Add up your pre-workout, coffee, energy drinks and tea, and see the daily total against the 400mg advised for healthy adults.
Almost nobody gets their caffeine from one place, and a pre-workout label can only ever tell you about itself.
A single ingredient is the easy part. The one that matters is the total across everything you take: whether two products supply the same nutrient, whether any combined total clears a published upper limit, and how much of what you pay for is doing nothing.
Verdict reads the whole panel from a photograph and does all of that at once. It reports the arithmetic and names the source of every figure. It doesn't tell you what to take.