Each subscription plan has a limit on the number of targets that can be monitored. Each plan comes with a maximum number of targets you can monitor plus the option to add additional targets. There are three (3) types of targets.
checkHTML / Web
The number of targets that you can monitor is determined by your subscription plan. Each plan has a maximum number of assignable targets. If you need additional targets you can upgrade to the next plan. Click here for a list of current plans.
Additionally, there are Bundled Options that allow you to increase the number of Targets that can be mixed or matched between any of the three target types.