Andy Rubin, who is leading Google’s Android efforts, said the platform is now seeing 500,000 device activations a day with 4.4 percent week-over-week growth.

At this pace, there have probably been just over 122 million Android devices activated, up from the 100 million figure the company announced in May at the I/O developer conference.

At that point in time, Android was seeing 400,000 device activations per day. Overall, this is still falls short compared to the reach of Apple’s iOS platform, which has seen more than 200 million devices cumulatively sold. But the gap is quickly closing.

A decent proxy for platform reach, as far as app developers are concerned, is to look at monthly actives for Facebook’s mobile apps on both Android and iOS. Facebook for iPhone is still 73 percent larger than Facebook for Android with 80.6 million monthly active users to 46.6 million monthly actives, according to our AppData tracking service.