The tablet-computer race is heating up. The latest entrant, Acer Inc.’s Iconia Tab A500, is the first to offer compelling competition to Apple’s dominant iPad in one crucial area: price.

The Iconia Tab has been keenly anticipated, if only because Acer, a Taiwanese company that made its mark by offering sharp but inexpensive laptops and netbooks, is the world’s second-largest PC maker after Hewlett-Packard Co. The Iconia Tab is Acer’s first to run Google’s Android operating system, and joins an increasingly crowded tablet field that features the PlayBook by Research in Motion Ltd., Motorola Inc.’s Xoom, LG Electronics Inc.’s G-Slate and Apple’s own iPad2, which went on sale in March.

A WiFi-only version of the Iconia Tab went on sale on April 24 for $449.99. A new model that works on AT&T Inc.’s 4G wireless network is slated for release this summer for an as-yet-undisclosed price.