Verify

Cookie Behavior Validator

Your affiliate cookie behaves differently in Chrome and Safari, and most creators have no way to see the difference. This runs real Chromium and WebKit sessions against your link, side by side, and shows you exactly what each browser does with your cookie: whether it sets, how long it persists, and whether iOS Safari's tracking limits cut it short before your conversion window closes.

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What it does

Runs real Chromium and real WebKit sessions against the same link simultaneously, not simulated behavior. Each session starts from a clean cookie state, exactly as a new visitor would arrive.
Distinguishes between two failure modes that look identical on the surface: cookie_rejected means the Set-Cookie header was sent by the server but the browser refused to store it (a SameSite or third-party block issue), while no_cookie_set means the network never issued the header at all. The cause determines the fix.
Detects how Safari classifies your cookie, first-party or third-party, and shows the exact expiry cap that applies. iOS Safari caps cookies set via cross-site redirects at 7 days, even when the network declares a 30-day Max-Age.
Compares your cookie's actual lifespan against the network's attribution window and flags the gap if Safari is cutting it short. Creators with iOS-heavy audiences lose a measurable share of attributable purchases to this gap. The Validator quantifies it for your specific links.

How it works

01
We launch both browsers
Real browser environments, not simulated, visit your link from a clean state. We capture every Set-Cookie header issued at every redirect hop, along with the cookie attributes that determine whether Safari will accept it.
02
We compare what each browser keeps
For each cookie set during the journey, we record its name, value, domain, expiration, SameSite flag, and the hop that set it. We then compare what Chromium stored against what WebKit stored. A cookie that Chromium accepts and WebKit rejects is the ITP signal.
03
We document the gap
The difference in cookie lifespan between Chrome and Safari is documented and ready to attach to a dispute letter. If your network's 30-day cookie is being capped to 7 days in Safari, that is a measurable attribution exposure, not a hypothesis.

What you’ll see

Other browsers (solid)iOS Safari (dashed)

Affiliate cookie survival by browser over a 30-day window. iOS Safari holds at 100 percent until the 7-day Intelligent Tracking Prevention cap (hour 168), then drops to 0 percent and stays there for the rest of the 30-day window. Other browsers stay at 100 percent throughout.
Time since click	iOS Safari cookie survival	Other browsers cookie survival
0h	100%	100%
7d	0%	100%
14d	0%	100%
21d	0%	100%
30d	0%	100%

The Cookie Behavior Validator tests how long an affiliate cookie survives in each browser. iOS Safari's Intelligent Tracking Prevention caps it at 7 days. Every conversion past that window goes unattributed unless caught.

Find out if Safari is costing you.

The full Cookie Behavior Validator is coming soon. Leave your details and we will tell you when real browser testing is available for your entire link portfolio.

Related features

Hijack Exposure Score

Per-link risk grade. Honey-class cookie hijack, scored and cited.

Link Chain Analyzer

Find the exact hop where your commission tag goes missing.

Cross-Browser Tester

Does your link pay out the same in Firefox? In the EU? Test it.

Beta

See this feature applied to your own links.

VigiLink is in active development. Join the beta list and we will reach out when the Cookie Behavior Validator opens, so you can see exactly how iOS Safari treats your affiliate cookie.

Join the beta →

Cookie Behavior Validator

Join the beta →

Affiliate cookie survival by browser over a 30-day window. iOS Safari holds at 100 percent until the 7-day Intelligent Tracking Prevention cap (hour 168), then drops to 0 percent and stays there for the rest of the 30-day window. Other browsers stay at 100 percent throughout.

Time since click

iOS Safari cookie survival

Other browsers cookie survival

100%

14d

100%

21d

100%

30d

100%