Concepts

Universal link vs deep link vs smart link: what's the difference?

Plain-English definitions of the link types every mobile team runs into — and which one you actually need.

"Universal link", "deep link", "deferred deep link", "smart link" — they get used interchangeably but mean different things, and picking the wrong one wastes engineering time. This guide defines each in plain English, shows where they overlap, and helps you decide which one fits your goal: opening a specific screen in an installed app, or simply getting people to the right store to download it.

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The problem

The terms are used loosely, so teams often build the wrong thing.
Deep linking into an installed app and routing to a store are different problems.
Most deep-linking solutions need an SDK and app-side configuration.
If your goal is just "get people to download my app", full deep linking is overkill.

With onestore.link

Deep link: opens a specific screen inside an already-installed app (e.g. yourapp://product/123).
Universal link / App Link: an https URL that opens the app if installed, otherwise the web — Apple's and Google's native standards.
Deferred deep link: remembers the destination through install, so a new user lands on the right screen after downloading (needs an SDK).
Smart link (what onestore.link is): one URL that routes each visitor to the correct store by device — the simplest path when the goal is downloads, no SDK required.

How to do it

No SDK, no rebuild. Just a URL.

1
Define your goal
Open a screen in an already-installed app? You need deep / universal links. Get people to download from the right store? You need a smart link.
2
Check if you need an SDK
Deferred deep linking (post-install routing) requires an SDK and app changes. Store routing does not — a smart link works with zero app-side code.
3
Pick the lightest tool that fits
If you just need a universal store link, onestore.link gives you one in a minute. If you need in-app screen routing on top, layer that separately.

Frequently asked questions

Is a universal link the same as a deep link?

Not quite. A deep link is any link that opens a specific location in an app. A universal link (iOS) or App Link (Android) is a specific standard: an https URL that opens the app when installed and falls back to the web otherwise.

What is a smart link?

A smart link is a single URL that decides where to send each visitor based on context — most commonly their device. onestore.link is a smart link that routes iOS users to the App Store and Android users to Google Play.

Which one do I need to get app downloads?

A smart link. If your goal is simply getting people to install your app from the correct store, you don't need deep linking or an SDK — a device-routing smart link like onestore.link is enough.