I normally recommend Covenant Eyes for online monitoring and blocking for anyone trying to quit using pornography but I have realized that Covenant Eyes does not work for everyone. Covenant Eyes using a VPN (virtual private network) and this may cause problems for some clients because their work does not allow them to use a VPN or their work uses another VPN. The app Purge may be useful in these situations. It works through DNS (domain name system) and can filter all content on the device. This way, you can use any browser you like to access the internet safely. Right now, Purge seems to only be available for apple users and it is highly recommended that you pay for the pro version or it tends to limit or even disconnect your internet connection. Another plus is that this app is much cheaper than Covenant Eyes but it does not take screen shots like Covenant Eyes does. Please note that when using Purge parental controls need to be enabled to prevent Purge from being deleted.