OneLink is the deep-linking technology inside the Deep Linking Suite of AppsFlyer, a mobile measurement and attribution company. A deep link is a link that opens a specific screen inside a mobile app instead of a web page; attribution is the work of finding which ad, email or page led to an install or a purchase.
A single OneLink detects whether the visitor uses iOS, Android or a desktop computer. A new user goes to the app store; an existing user goes straight to the linked content in the app. Deferred deep linking stores the link parameters before the install and restores them on the first app open, so the new user still lands on the intended screen. For websites, Smart Banners and Smart Script create these links for banners and download buttons and attribute each conversion to its traffic source. Links can be branded, given expiry rules, turned into QR codes and created in bulk or through the OneLink API.
It is a hosted service, also sold as a standalone product. Plans range from a free tier for owned media to billing per conversion and custom Enterprise pricing.