According to research firm Chitika (via GigaOM), Google's Chrome browser for iOS now accounts for 3% of total iOS web traffic, up from 1.5% when it was first released for the platform in June 2012. The research attributes the browser's rise in usage to a release of the new version of Chrome optimized for iOS 7, an advertising campaign for the browser, and the release of the new iPhone 5s and iPhone 5c on September 20.
While Chrome usage share on iOS devices rose only about 0.3 percentage points following September 22, keep in mind that iOS has an incredibly large existing user base meaning that usage changes need to be exceptionally great to cause a significant impact. In this realm, Google still has work to do, but the recent growth is a likely indicator that Chrome is regaining some traction in the iOS browsing space.
Google has regularly updated Chrome since its debut, including an update in July that improved interoperability with other Google Apps by giving users the ability to open links for YouTube, Maps, G+ and Drive in the app instead of the browser itself. Earlier this month, a report detailed an issue in Chrome for iOS 7 that revealed private Incognito seraches, but Google notes that this issue is the result of iOS limitations that require regular and incognito tabs to share the same HTML5 local storage.