State of Universal Links and App Links 2026 (v1: Tranco top 10,000)

Aggregate measurements of how the 10,000 most popular websites (Tranco list 746VX) publish Apple's apple-app-site-association file (via Apple's CDN, the copy iOS 14+ devices download) and Android's /.well-known/assetlinks.json. Scanned 31 October 2026. 21.7% of domains have a valid AASA file on Apple's CDN, 17.2% serve assetlinks.json (lower bound), 15.1% both; 45.6% of AASA files use only the legacy paths format. Includes breakdowns by rank band, definitions, method, a hand-validated error analysis (203-domain stratified sample) and limits. Aggregates only; no per-site data. Data: CC BY 4.0; code: MIT. Write-up: https://bestlatestapps.com/blog/state-of-universal-links-and-app-links-2026/