Short answer: Deferred deep linking means a person who taps your link without the app installed goes to the app store, installs, and then lands on the exact screen the link pointed to on first open. A normal deep link can't do this; it only works when the app is already on the phone. You can test it yourself with a phone, the app deleted, and the campaign link.
What is deferred deep linking?
Deferred deep linking: sending a new user to a specific screen in an app on the first open after they install it from a link.
Neither Apple nor Google defines the term; it's the industry name. "Deferred" refers to the delay: the link is tapped before the app is on the phone, and acted on after install.
Deep link: a link that opens an installed app on a specific screen, such as a product page or an invite, instead of the home screen.
How is a deferred deep link different from a normal deep link?
A normal deep link only works for people who already have the app; a deferred deep link also works for people who have to install it first. For new users, that's the difference between landing on your offer and landing on the home screen.
| Normal deep link | Deferred deep link | |
|---|---|---|
| App already installed | Opens the right screen | Opens the right screen |
| App not installed | Website or store, then the home screen after install | Store, then the right screen on first open |
| Typical uses | Push, email and retargeting to existing users | Ads, influencers, referrals and QR codes aimed at new users |
| Needs a tool or SDK | Usually set up by your developers | Yes, usually a deep linking or attribution SDK |
Apple says that if the app isn't installed, "the system opens the URL in their default web browser". After an install, the first open starts from the home screen icon, so the app never sees the link unless something restores it.
Why does it matter for campaigns?
Most acquisition campaigns send new users, so most of them depend on it:
- Influencer and affiliate links: the creator's code or offer has to survive the install.
- Referral invites: the new user should land on "accept invite", not a sign-up screen with no context.
- Product ads: someone who tapped a specific shoe should see that shoe, not the home feed.
- Printed QR codes: a scan from a poster or package should open the promised page.
When it fails, you still get installs, but people have to search for what they came for.
How do you test a deferred deep link?
You need an iPhone, an Android phone and the live campaign link, tapped from the channel people will use.
- Check the link first: paste it into the link checker to see its parameters and catch broken UTM tags.
- Delete the app from both phones.
- Send yourself the link through the real channel: an Instagram DM, a WhatsApp message, an email or a printed QR code.
- Tap it on the iPhone. Confirm it goes to the App Store listing for the right app.
- Install the app from that page and open it straight away. Write down the first screen you see.
- Repeat on the Android phone through Google Play.
- Now, with the app installed, tap the link again on both phones. It should open the app directly on the same screen.
Record the results in a simple grid:
| Test | iPhone | Android |
|---|---|---|
| Not installed: lands on the right store page | ||
| Not installed: first open shows the right screen | ||
| Installed: opens the app on the right screen | ||
| Opened inside Instagram or another in-app browser |
What do the results mean?
- Store opens, but first open shows the home screen: deferred deep linking isn't set up, or the tool's plan doesn't include it. The developer note on lost context after install is the one to send your developers.
- Works on Android but not iPhone: expected to differ. On Android, Google Play passes a referrer to the app after install; Apple has no equivalent, so iPhone results depend on the tool's matching method.
- Works from Messages but not Instagram: in-app browsers often show the website instead. See links opening the website in Instagram.
Install referrer: a value Google Play hands to an Android app after install, describing where the install came from. Google says it is available for 90 days and won't change unless the app is reinstalled.
If the screen is still wrong after these checks, the troubleshooter for deferred links that open the home screen walks through the likely causes step by step. Your developers will find the setup detail in the deferred deep linking developer guide.
What should you ask your deep linking tool?
- Is deferred deep linking on our plan, or a paid tier?
- How does it match the first open on iPhone, and what happens when there's no match?
- Does the same link also record which campaign drove the install?
- Can we use our own domain for links?
For a longer pre-launch routine, this deep link QA checklist covers each check before a campaign goes live.