Google just confirmed that it’s bringing its Google Assistant to the iPhone, expanding its voice technology beyond Google Home and Android devices, potentially making it a more formidable competitor to Apple’s Siri, Amazon’s Alexa and Microsoft’s Cortana.

The announcement was made at the Google I/O developer conference in Mountain View, Calif.

In addition, Google announced that it’s bringing voice calling to its Google Home smart speaker. Amazon last week announced a similar feature for its Echo speakers. Another new Google Home feature is proactive alerts, a version of which Amazon announced this week.

Google also announced a software development kit that will allow third-party device makers to incorporate Google Assistant into non-Google hardware, following in the footsteps of Amazon’s expansion of Alexa beyond its own Echo devices.

Microsoft offers Cortana on the iPhone and last week announced plans to deepen the connection between Windows 10 and the Cortana apps for Android and iPhone in an upcoming feature called Timeline, tracking a user’s activity across the devices.

Among other news, Google announced plans for standalone VR headsets.

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