3 rivals to Apple’s smartwatch ambitions by Verne Kopytoff @FortuneMagazine March 9, 2015, 6:49 AM EDT E-mail Tweet Facebook Google Plus Linkedin Share icons With its upcoming smartwatch, Apple is trying to do what no other company has with the upstart category of wrist-worn computers: Create a hit. The technology giant is hoping to make Watch, a device that displays emails, tracks fitness activity and, of course, tells time, into a yet another blockbuster product in line with the iPhone and iPad. Executives will reveal more details about its capabilities on Monday in prelude to Watch going on sale in April (Check out Fortune’s coverage of the event starting at 1 p,m. EST). But Apple AAPL is hardly alone in pushing smartwatches. A number of manufacturers are also trying to solve the riddle – to varying degrees of success. Some of their devices look so clunky that few people would be caught dead wearing in them in public. Others are clumsy to use and offer little in the way of compelling features. Virtually all are poor substitutes for the smartphone, which have big enough screens to handle most basic online chores while small enough for people to conveniently carry in their pockets. Still, smartwatches may be useful or intriguing to buy, particularly for those who like to be on the cutting edge. Here are a few options that, unlike Apple’s Watch, are already on sale. But warning: Many manufacturers plan to update their smartwatches in the next few months.