How we test deep links

Every platform behaves differently. This is the evidence standard behind the generator, reference table, and guides published on OpenLinkInApp.

Method last reviewed

The short version

We document only behavior implemented by the live generator. The 25 entries in the tested deep link reference each include a representative URL that is exercised against the shipping URL builders. Platforms without a dependable custom scheme use a safer operating-system fallback instead of an unverified shortcut.

The four-part test process

A successful app open is only half the test. The fallback must also be safe and useful.

  1. 1

    Start with a real public URL shape

    Each platform entry uses the same kind of URL a person gets from that app's Share button: a YouTube watch URL, a Telegram invite, an Amazon product page, or a platform short link. We do not test invented schemes in isolation and assume they will work in a real share flow.

  2. 2

    Run it through the shipping generator

    Reference samples are passed through the same URL parsing and app-link builders used by the live tool. Automated tests fail when the published table and the code disagree, which prevents documentation from quietly describing behavior the product no longer has.

  3. 3

    Check both operating-system paths

    Android output is checked for a valid intent URL and an HTTPS browser fallback. iPhone output is checked for a known app scheme only where one is reliable; otherwise the tool keeps the HTTPS destination or uses a Safari hand-off from an embedded browser.

  4. 4

    Test failure paths, not only success

    A useful link must degrade safely. We check unsupported websites, missing apps, short-link expansion failures, malformed input, unsafe URL schemes, desktop visitors, and fragments or query parameters that must survive the hand-off.

What a “verified” result means

It means the published URL transformation matches the current generator, the output remains syntactically valid, and the documented fallback is present. Where behavior depends on an app developer's Universal Link or App Link configuration, the reference says so explicitly.

What it does not guarantee

No third-party deep-link tool can guarantee an app opens on every device. The installed app, operating-system version, browser, regional app package, user settings, and changes made by the destination platform can all alter the result. The browser fallback is therefore part of the product, not an afterthought.

Updates and corrections

Platform behavior changes without notice. When a supported URL stops opening correctly, we reproduce the problem, update the implementation and its regression test together, then change the verification date shown on the reference.

Guides are written and manually reviewed for this site. We do not accept paid rankings in the comparison guides, and no platform is marked as supported because of a commercial relationship. If a claim is wrong, send the failing URL, device, operating-system version, and source app to the contact address. Reproducible corrections are prioritized over adding new platforms.

Primary technical references

The implementation follows the platform owners' public specifications, then tests the behavior the generator actually ships.