Online Tool Store
· 6 min read
Top 3 Deep Link Generators Compared
Heshan Fernando
Co-founder & COO
You send a link to a product. On a phone with the app installed it should open the app on that product. Without the app it should open the web page. Instead it opens a browser inside Instagram, where nothing works properly and the user gives up.
Three mechanisms are involved and they behave differently. Custom URI schemes like myapp:// are simple and fail silently when the app is absent. Universal Links on iOS and App Links on Android are HTTPS URLs verified against a file on your domain, so they degrade to the web page naturally. Getting the combination right — and the fallback — is the entire job.
How to judge a deep link tool
Does it produce the verification files? apple-app-site-association and assetlinks.json are what make Universal Links and App Links work. Without them you have a normal URL.
What happens with no app? A store page, a web page, or nothing at all — and the right answer differs by context.
Does it need an SDK? Some services require integration in the app before their links work.
Is the link yours? A generated redirect on someone else’s domain is a dependency, and links live a long time.
The comparison
| Tool | Best for | Free tier | Watch out |
|---|---|---|---|
| FastUtil Deep Link Generator | Generating the verification files themselves | Free, entirely in your browser | Config files still need hosting on your domain |
| OpenLinkInApp | Escaping in-app browsers on social platforms | Free, unlimited, no signup | Link lives on their domain |
| Smart App Links | Store fallback with click analytics | Free plan: 1 smart link | Account required |
Facts checked August 2026; tools change their plans. Table covers only the 3 alternatives — our tool gets its own section below.
FastUtil Deep Link Generator
The most technically complete, and the only one addressing the part people get stuck on. It generates three things: custom URI scheme links, the apple-app-site-association file for iOS Universal Links, and the assetlinks.json file for Android App Links — the two configuration files that make verified HTTPS deep links work at all.
Everything is generated in your browser, and it states that your Team ID, bundle ID, package name and certificate fingerprint never leave your device — which matters, since those are the identifiers tying an app to a domain. Free, no account. You still have to host the resulting files at the right paths on your own domain; the tool cannot do that part for you.
OpenLinkInApp
The one solving a specific and infuriating problem: links opened inside Instagram, TikTok or Facebook’s embedded browser, where sessions and payments frequently break. It converts a normal URL into one that pushes through to the native app, using whatever route is safest on the platform — a verified app scheme, a Universal Link, or a hand-off to Safari on iOS, and intents with automatic browser fallback on Android.
Free with unlimited usage, nothing to install and no signup, producing a shareable link immediately. The trade is dependency: the link points at their domain and relies on their service continuing to exist, which is a real consideration for a link going into printed material or a long-lived campaign.
Smart App Links
The marketing-oriented option. It creates deep links with automatic store fallback so users without the app land on the App Store or Play Store, plus click analytics broken down by device, platform, referrer and country — and it does this with no SDK, no code changes and no app store review.
An account is required, with a free tier limited to one smart link and no credit card needed. For a single campaign link that is workable; for a product that generates links programmatically it is the start of a pricing conversation. The analytics are the actual product.
Deep Link Builder
Ours constructs deep links with universal link and custom scheme forms plus the web fallback for users without the app — the three pieces together, in one place, with no service in the middle. Nothing is hosted on our domain, so the link you get is yours and keeps working regardless of what happens to us.
What it does not do: generate the apple-app-site-association and assetlinks.json verification files, provide click analytics, or break out of in-app browsers on social platforms. For the verification files, FastUtil covers exactly that; for escaping Instagram’s browser, OpenLinkInApp is purpose-built. Android’s App Links documentation explains why the verification file is what separates a link that works from one that shows a chooser dialog.
Which one to pick
- Setting up verified links for your own app — FastUtil’s config files.
- Links shared on Instagram or TikTok — OpenLinkInApp.
- Tracking clicks by platform and country — Smart App Links, within its free single link.
- A link you own, with a proper web fallback — the tool below.
How to do it with Deep Link Builder
- Open the Deep Link Builder and enter your app’s scheme and the target path.
- Add the universal link form — HTTPS links degrade to the web gracefully, custom schemes do not.
- Set the web fallback to the equivalent page, not your homepage. Dropping someone on a homepage loses them.
- Test on a device without the app installed. That path is the one that breaks silently.
The walkthrough is in how to build a deep link that falls back. Other developer tools are in the tools directory.
You might also need
If the link is going into a QR code for print, the QR Code Generator handles that step.
The URL Encoder Decoder is worth having open when deep link parameters contain characters that need escaping.
Frequently asked questions
What is the difference between a universal link and a URI scheme?
A URI scheme like myapp:// is a custom protocol only your app claims — if the app is missing, nothing happens. A Universal Link or App Link is a normal HTTPS URL verified against a file on your domain, so it opens the app when installed and the web page when not.
Why does my deep link open a browser inside Instagram?
Because in-app browsers intercept links rather than handing them to the system. Escaping requires platform-specific tricks, which is precisely what tools like OpenLinkInApp exist to do.
Do I need an SDK for deep links?
Not for basic deep linking — Universal Links and App Links are configured with files on your domain and settings in the app. SDKs come in for deferred deep linking, where a link survives an install and takes the user to the right place afterwards.
Final thought
Test the no-app path on a real device before shipping. Everyone tests with the app installed, and the fallback is where most deep link bugs quietly live.