HappyOrNot Ltd. is a Finnish company that makes feedback terminals for measuring customer satisfaction.

This information is used by companies to find points where they provide suboptimal service and to improve it.

[4] Notable applications include Heathrow Airport since 2012, which was a breakthrough contract for the company as it made the terminals visible to international business leaders, and the stadium of the San Francisco 49ers, which uses the terminals to find and solve service problems (such as bathrooms running out of paper towels) in real time during events.

[3] The terminals normally only upload data once a day (via the mobile phone network) to preserve the battery.

Future versions are planned to require lower-powered Narrowband IoT technology that will allow terminals to be constantly connected.