An example of a web tool used for differentiated instruction is the use of videos for classroom viewing followed by an interactive step using a mobile device. An example below includes using two short Khan Academy videos. One would be used as a broad overview to the subject followed by another that details the specific topic.
Khan Academy video
https://www.khanacademy.org/humanities/art-history/art-history-basics/beginners-art-history/v/why-look-at-art
Following viewing both videos, a Powerpoint presentation would be shown detailing the topic even further with a poll asking open-ended questions given to the class afterward. Students would vote using their phones, tablets or notebooks with the results shown immediately on the Powerpoint.
ParticiPoll
https://www.participoll.com/