Top Reference apps in United States 🇺🇸
As of May 18, 2026, Merlin Bird ID by Cornell Lab is the #1 Reference app in United States on iOS.
iOSAndroid
#App / PublisherCategoryIntel
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What changed
Movement between the previous day and May 18, 2026.
New entrants
Risers
- R:BT Mob App
#96 → #49
Wikipedia#91 → #53
Filament Bible#100 → #80
A/C Pro#93 → #81
- Bible - Daily Bible Verse KJV
#26 → #15
Fallers
APA Meetings#57 → #100
Vermilion County Sheriff, IL#45 → #69
- GeauxVote Mobile
#7 → #27
Blessed - Daily Verse & Prayer#55 → #73
- Lens AI: Identify Anything
#35 → #47
Methodology
Rankings are pulled daily from the iOS store charts for United States. We snapshot the top entries each day and compute day-over-day change relative to the prior snapshot. See our full methodology for data sources, refresh cadences, and quality filters.
Frequently asked questions
What is the #1 Reference app in United States on iOS?
As of May 18, 2026, Merlin Bird ID by Cornell Lab is the #1 Reference app in United States on iOS, based on the public iOS chart rankings Marlvel tracks daily.
How often are these rankings updated?
Marlvel snapshots the iOS charts for United States every day and computes day-over-day movement. The "Current" page always reflects the latest snapshot; dated archive pages preserve each day's top 50.
Where does Marlvel's ranking data come from?
Rankings are pulled from the public iOS store charts for United States. See our methodology for data sources, refresh cadence, and the quality filters applied before a ranking is indexed.