In Qualaroo, you can choose to pause the survey once your set response limit is attained.
Benefits of automatically pausing surveys:
To automatically pause the survey when the response amount has been met:
In the TARGETING section,

We also have a 5,000 response limit that removes the ability to view responses via the reporting dashboard.
That is all about enabling the setting to deactivate nudge once the response amount has been met automatically.
Related Articles:
Archive a Survey in Qualaroo for Future Use