No, there is no free version of WebWatcher available. You also don’t get a free trial or money-back guarantee, so there really is no way to try the app risk-free.
If you insist on a free app, there are some decent free parental control apps out there, but most of them are limited — they lack essential parental control features and often only allow you to monitor 1 device. This is why I prefer premium parental control apps like Qustodio, which offers a free trial and costs just US$ 54,95 / سنة.