Comscore: Google's share of the top 15 US mobile apps has increased from 33% to 46% since 2015; Facebook has retained 20% of the market from 2015 to 2021
Sara Fischer / Axios : Tweets: @sarafischer Tweets: Sara Fischer / @sarafischer : Google and Facebook's share of the top 15 mobile apps by reach in the U.S. has increased in the past few years, despite the fact that dozens of new mobile apps, from TikTok to Zoom, have experienced record downloads. https://www.axios.com/...
Context & Ripple Effects
Comscore has been charting this consolidation for years: back when US smartphone penetration hit 77% and Facebook Messenger displaced YouTube as the #2 app in 2015, the top of the chart was already a two-company story. By 2016 apps accounted for half of all time US users spend online, and Nielsen's tally showed Facebook alone reaching 146M monthly uniques with Messenger and YouTube close behind.
The new data closes that loop: six years on, Google's slice of the top 15 US apps by reach has grown from 33% to 46%, while Facebook has held exactly 20%. The striking part is that this happened during a period when TikTok and Zoom posted record downloads — newcomers are winning installs without denting the incumbents' reach.
First-order effects
- Google's app portfolio — spanning search, video, maps, and mail — now accounts for nearly half of top-15 US mobile reach, making it the default reach-buy for any advertiser targeting US smartphone users.
- Facebook's flat 20% share signals its reach growth has stalled even as its properties remain entrenched; its competitive position is now defense rather than expansion.
Second-order effects
- Record-download apps like TikTok and Zoom are competing for time and engagement, not reach — which pushes them toward monetizing intensity of use rather than audience breadth, a different ad pitch than Google's and Facebook's.
- With reach concentrated in two portfolios, smaller apps face a distribution squeeze: their download success doesn't translate into top-15 presence, raising the value of preinstallation and default placements that Google controls.
Third-order effects
- If the pattern holds, US mobile attention structurally consolidates around platform portfolios rather than individual apps — reach becomes an asset owned by a handful of companies regardless of how vibrant the long tail of downloads looks.
- That concentration dynamic gives regulators and advertisers alike a durable metric: share of top-15 reach, which moves slowly enough to serve as evidence in both competition debates and media-buying strategy.
The trend: Despite a constant stream of breakout apps, US mobile reach keeps concentrating into Google's and Facebook's portfolios, with newcomer wins measured in downloads rather than durable top-15 presence.