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Roku had an outstanding first quarter, delivering better-than-expected financial results with strong business momentum. As a result, we are increasing our financial outlook for 2019. The strength of our brand, the scale of our active account base, the advantages of our purpose-built streaming OS, and the engagement of our users make Roku an increasingly important partner for content publishers, advertisers and TV manufacturers. The shift to streaming and away from linear TV and legacy distribution platforms has enormous momentum. We estimate that in Q1 2019 more than one-in-three smart TVs sold in the U.S. were Roku TVs, making the Roku OS the #1 selling smart TV OS in the U.S.
A few Q1 2019 highlights:Total net revenue grew 51% YoY to $206.7 million;
Platform revenue increased 79% YoY to $134.2 million;•Gross profit rose 60% YoY to $100.9 million;
Active accounts were up 2.0 million incrementally vs. Q4 2018 to 29.1 million;
Streaming hours increased 1.6 billion hours vs. Q4 2018 to 8.9 billion;
Average Revenue Per User (ARPU) was $19.06 on a TTM basis, up $1.11 vs. Q4, and up 27% YoY;
Roku monetized video ad impressions again more than doubled YoY in the quarter.