Régulateur, developed by Eric Kunz, is a free utility tool available on iPhone. This program offers a variety of features tailored for setting watches and clocks. Users can conveniently set and store a second time zone within the app, ideal for managing GMT watches. Additionally, the app displays the current moon phase, aiding users in setting their annual calendar timepieces.

Moreover, régulateur caters to users with perpetual calendars by showcasing essential information such as the month, date, day, and time within the leap year cycle. This comprehensive tool provides a convenient solution for individuals looking to accurately adjust their timepieces.