Apple Inc.’s iPad widened its lead in the tablet market to 68 percent in the first quarter, while most devices running Google Inc.’s Android software saw sales slump, according to IDC.

Apple’s market share climbed from 55 percent in the previous three months, the Framingham, Massachusetts-based research firm said.

Amazon.com Inc.’s Kindle Fire, which runs on Android, saw its share tumble to about 4 percent, from 17 percent in the previous quarter.