Plickers

Plickers is a powerful, timesaving tool that provides teachers with instant formative, or summative, assessment in an objective fashion. Students simply turn their card to the letter A, B, C, or D while the teacher uses the quick-to-launch Plickers app to simultaneously scan the cards through the lens of his or her smartphone camera. Instantly, the students' answers load right to the screen! Recording answers of an entire class takes mere seconds, and the cards can be scanned from almost anywhere in the room!

One of the best, and most attractive, features of Plickers is that it only needs ONE smart device to record an ENTIRE class! That means that no matter what the financial situation of your students, or your school district, as long as you have one smart device available, you can instantly collect student input. Genius.

The online component of Plickers is simple, yet powerful, just like the app. Click on Live View to load student answers to your computer in real time. If you have an interactive whiteboard or projector, you can allow your class to see their answers in real time. You can even hide what students answered until all of the students have finished. The online component also allows you to create questions, view previous poll results, or browse the help menu to find an answer to your question.
Since the app is dependent on student cards, I took the time to print two sets on card stock and laminate them with a matte lamination. You could easily print the cards (available on the website) and use them instantly, but if you are planning on using these long-term, you may want to make several sets. The cards are designed well. The unique code for each card is quickly readable from over 30 feet away on my iPhone 6, yet students can't easily see another student's answer, because the letter choices are 12-point font!

Resource : http://tinyurl.com/og9rkka , http://tinyurl.com/q7b74at