The Affectiva iOS Sample Code by Affectiva demonstrates how to implement facial expressions using icons through the camera of an iOS phone. To work with the sample, developers need to obtain the SDK from Affdex official site, copy the kit into the frameworks project, and add the license file. Guides available on GitHub. Authored by Boisy Pitre.
With huge budgets spent on marketing, it's probably a good idea to keep track of which marketing avenues are working and which aren't. Call Tracking Metrics is a simple telephone call tracking service that aims at helping users link incoming calls to specific marketing campaigns and in so doing, easily track and analyze the amount of calls received due to that particular campaign. The Call Tracking Metrics API provides access to this functionality.