FAQ
www.limesurvey.org/services#pricingHostedSubscription
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How are responses counted?
In a short sentence...
A response is counted if a participant completes your survey once, not taking in account how many questions or question groups there are in your survey.
In a more detailed description...
A survey is taken and completed => 1 response
A survey is taken and only half completed => 0.5 response
A dataset gets manually added through an administrator => 1 response
A partially done survey gets marked as finished by an administrator => 0.5 response
Question around the professional hosting can only be answered by LimeSurvey GmbH.
So please contact them directly.
www.limesurvey.org/contact-us