Geoceptor vs GeoSpoof: A Signal-by-Signal Comparison

Changing the location a website sees is the easy part. Any extension can set navigator.geolocation to coordinates in Paris. The hard part is making every other signal agree, because a site that catches one disagreement doesn't see Paris — it sees someone pretending to be in Paris, which is worse than not hiding at all.

So instead of comparing feature lists, we put Geoceptor and GeoSpoof through the same test: our own browser location test page, which probes the full stack of signals a real fingerprinting script would check. Same browser, same target location, same seven checks. Every screenshot below is a live result.

How the test works

The verify page doesn't just read back the location you set. It pulls each signal independently — WebRTC, the timezone offset, individual Date methods, locale formatting, and a set of exotic execution contexts — then checks whether they tell the same story. A green result means the signals are internally consistent. A red one means a site could spot the contradiction.

If you want to follow along, install either extension, set a location, and open the test yourself. Nothing here is hand-picked; it's just what the page returns.

1. The overview

First, the top-level verdict with each extension active and spoofing to the same location.

GeoSpoofGeoceptorGeoSpoof comes back clean; Geoceptor leaves several signals exposed.

Geoceptor moves the location, but the summary flags exposed signals across WebRTC, the timezone offsets, Date components, date and time strings, and the advanced surfaces. GeoSpoof reports a clean, consistent result. The rest of the post is just walking through why — one signal at a time.

2. WebRTC

WebRTC is the leak that bypasses VPNs, and it's the one that matters most: it can hand a site your real public IP directly, regardless of what your geolocation says.

GeoSpoofGeoceptorGeoSpoof patches WebRTC; Geoceptor doesn't protect it.

Geoceptor leaves WebRTC untouched, so the real IP surfaces. A spoofed geolocation pointing at one country while WebRTC quietly reports an IP in another is exactly the kind of contradiction fingerprinting systems live for. GeoSpoof closes the surface so there's nothing to cross-check against.

3. Timezone and offsets

Setting the timezone name is easy. The trap is the offset, and specifically historical offsets — the UTC offset for a zone isn't constant, because daylight saving rules have changed over the years. A correct spoof has to return the right offset for any date, not just today.

GeoSpoofGeoceptorGeoSpoof gets every date right; Geoceptor sets the zone but mishandles historical offsets.

Geoceptor changes the timezone correctly for the present, but doesn't account for historical offsets, so a Date constructed for a past year reports an offset that doesn't match the zone it claims. GeoSpoof computes the offset from the zone's full history, so it stays consistent no matter which date a script picks.

4. Date components

Scripts can read the clock through individual Date methods like getHours() and write to it with setHours(). These have to reflect the spoofed timezone, and they have to round-trip correctly.

GeoSpoofGeoceptorGeoSpoof is correct; Geoceptor returns wrong values from getHours/setHours.

Here Geoceptor gets getHours and setHours wrong — the local-time components don't line up with the timezone it's presenting, and the setter doesn't behave consistently with the getter. GeoSpoof returns the correct values for both.

5. Date and time strings

The Date object also stringifies itself, and those strings embed the timezone name and offset in plain text. toString(), toTimeString(), and toLocaleTimeString() all have to agree with everything above.

GeoSpoofGeoceptorGeoSpoof's Date string methods match the spoofed zone; Geoceptor's disagree.

Geoceptor returns the wrong Date.toString, Date.toTimeString, and Date.toLocaleTimeString — the strings still carry traces of the real timezone. A script doesn't even have to call a special API for this; it just formats a date and reads the offset out of the text. GeoSpoof gets all three right.

6. Intl formatting

Credit where it's due. The Intl API is another way to read the locale and timezone, and this is the one check both extensions pass.

GeoSpoofGeoceptorBoth handle Intl formatting correctly.

Both Geoceptor and GeoSpoof return correct Intl formatting. If Intl were the only signal a site checked, either extension would do. It isn't, which is the whole point of the other six sections.

7. Advanced surfaces

The last check is the exotic stuff: code running in contexts that aren't the main page. Blob URLs, data URLs, and nested workers each get their own JavaScript environment, and a spoof that only patches the top-level window leaves these wide open.

GeoSpoofGeoceptorGeoSpoof covers blob-URL, data-URL, and nested workers; Geoceptor leaks through them.

Geoceptor gets blob-URL, data-URL, and nested workers wrong — spin up a worker through one of these and it reports the real environment, undoing the spoof from inside. These are the hardest surfaces to cover, and they're where a lot of extensions stop. GeoSpoof handles all three.

The scorecard

Why this matters

None of these are obscure edge cases. WebRTC leaks are the first thing a privacy-aware site checks. Timezone offset and the Date string methods are read by routine fingerprinting libraries without any permission prompt. Workers are how modern apps run code off the main thread. Each leak on its own is a contradiction, and contradictions are what get you flagged — a site cross-checks the signals and pounces on the one that disagrees.

That's the difference the test surfaces: Geoceptor changes the location, but the supporting signals don't all follow. GeoSpoof's whole design goal is that they do, so a site checking any of them sees one coherent location instead of a seam. If you're shopping for a Geoceptor alternative, that consistency — not the length of a feature list — is what separates the best location spoofing extension from one that just moves the map pin.

Try it yourself

Don't take our screenshots for it. Install GeoSpoof, point it somewhere, and run the browser location test. The page checks the same signals against whatever you have active and shows you exactly which ones hold up.

GeoSpoof is free on Firefox, Chrome (and Brave/Edge), and the App Store for iPhone, iPad, and Mac:

FirefoxDesktop & AndroidAdd to Firefox →ChromeChrome, Brave & EdgeAdd to Chrome →iPhone, iPad & MacSafari via the App StoreGet on the App Store →

We tested Geoceptor as it behaved on the date of this post; extensions change, and a later version may close some of these gaps. The test page is public, so you can always re-run the comparison yourself and see the current state.