StringKing logs information about all of your string changes. With iCloud syncing, you can track changes with multiple devices such as iPads, iPhones, and Macs. Whether you are a professional musician, technician, collector, instructor, or hobbyist, you can log the brand of strings, the gauges of strings, price, as well as remember any non-standard tunings on your instruments. StringKing keeps a running log on your device, with dates of each string change, and you can also set reminders to change your strings. In addition to the details above, you can also store notes about your experience with specific brands, gauges, and tunings. StringKing is ideal for instruments with 4 to 12 strings.