Blocking material that kids should not access

What is the best way to be sure that kids cannot see inappropriate material on their computers, phones and lab tops?   I know that the stock answer is to maintain parent awareness but this isn't always possible.  Your suggestions are appreciated.
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Install some parental control software on devices.
I installed Kaspersky Internet Security on my kid's computer (when he was kid :) ) to prevent him from opening inappropriate content, and also to prevent him to spend too much time on computer (2 hours per work day, 4 hours weekend).
You can use any parental control software including Windows parental control.
Home PC's and laptops can use OpenDNS and/or Parental Controls (feature inside Windows 7/8/10). This requires YOU to be the admin, and the kids having only User/guest accounts,

Phones/tablets are slightly harder to maintain though, but best approach would be the same (admin account for you, guest for the kids). This requires a newer phone/tablet though which has the multi-user feature built-in (newer Samsungs with preloaded with Lollipop). And it doesn't go much further than restricting apps and in-app purchases, meaning browsing habits are outside your control.

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Something else to try

This prevents children going on the bad web sites. It is free to setup for home users.

You will need to reconfigure your router.
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The parental controls for both Windows and Mac OS X are built in.
Free third party software:
Windows Family Safety (Windows)
K9 Web Protection (Windows/Mac OS X)
Avira Parental Control for Social Media (Windows/Mac OS X)
Qustodio (Windows/Mac OS X/iOS/Android)
Norton Family (Windows/Mac OS X)

Free Web filters:
WebFilter Pro (Google Chrome/Mozilla Firefox Add-on)
FoxFilter (Google Chrome/Mozilla Firefox Add-on)
Nanny for Google Chrome, LeechBlock for Firefox (Browser Extensions)
tinyFilter (Chrome Extension)

Read this By Brandon Widder on
tonyadamRetiredAuthor Commented:
We are trying to use OpenDNS but are having difficulty with making this service work properly.  I don't want to close the question until I am confident that this service is working.  I've contacted OpenDNS forum with some questions but cannot seem to get a response.  If any of our EE folks are familiar with this service and its installation, please let me know.
Setup of OpenDNS differs from router model.

Read this guide for tips.
"How to Use OpenDNS on Your Router, PC, Tablet, or Smartphone"
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