Usurv charges only for what you use, it is free to register.  You will only be charged when you submit a survey. 

The cost for a survey is 20p for the first question multiplied by the number of participants you require in your survey.  If you want to ask one question of 100 participants the cost of the survey will be £20 (excluding VAT).  If you want to ask 1,000 participants the cost will be £200.

Additional questions are charged at 10p per respondent.  Therefore if you want to ask 100 respondents five questions, the cost is £60 - .20p for the first question and four questions at .10p each = .60p multiplied by 100 = £60 (excluding VAT).