Comparisons
Three choices people get wrong before they buy anything.
Where the checks run, who does the checking, and whether you are measuring authorship or quality. Each page compares approaches rather than vendors.
Same input, different instruments.
Offline checks versus cloud checkers
Most cloud checkers run reasonable rules. The choice is really about whether the work can leave your machine, and what you can prove about the result afterwards.
Read the comparisonManual review versus automated checks
Every argument about replacing one with the other assumes they answer the same question. They do not, and the cost of confusing them is paid in escaped defects.
Read the comparisonAI detection versus verification
One produces a percentage nobody can defend in a dispute. The other produces findings, a score and a name. They get sold as the same category and they are not.
Read the comparison
Try the difference
Nothing uploads. That is the whole argument.
Paste a file and watch the checks run locally. The comparison stops being theoretical once you have done it once.