The best replacement for ok google is siri.

The best alternatives to ok google are rated as following:
★★★★★  siri

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Speaking about ok google, one probably shouldn't forget about nova launcher.

Other search terms related to ok google and their ratings are:
★★★★★ nova launcher
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Google Trends

Scale is based on the average worldwide traffic of ok google in all years. Click on graph for more.
ok google
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