These are all custom variables already available for every website which contains our tracking code. You don’t need to do any detailed tehnical implementation to use it.
You can use these variables in AB testing experiments, web personalization creatives or surveys for every subscription type.

Example: Hi visitor from {CITY}!

{COUNTRY}

The country in which the visitor is.
Accuracy: 100%

{REGION}

The region in which the visitor is.
Accuracy: 80%

{CITY}

The city in which the visitor is.
Accuracy: 70%

{TEMPERATURE_C}

The weather temperature (Celsius) at visitor’s location.
Accuracy: 70%.
Updated  every 4 hours

{TEMPERATURE_F}

The weather temperature (Fahrenheit) at visitor’s location.
Accuracy: 70%.
Updated every 4 hours

{REFERRER_DOMAIN}

The website domain (for www.google.com the domain is google.com) for referring website.
If the visitor entered directly on the website, the referrer domain  will be empty.

{VIEWS_SESSION}

Number of views realized in the current session. Example: 45

{DAYS_SINCE_FIRST_VISIT}

Number of days since first visit. We detect first visit starting from the moment in which our tracking code was installed on website. Example: 7 (can be 0 too)

{DAYS_SINCE_LAST_VISIT}

Number of days since last visit. Example: 14 (can be 0 too)

{BROWSER_NAME}

The broser name detected from user agent. Possible values: Firefox, Chrome, Safari, Opera, Mozilla, Explorer, Netscape, Camino, OmniWeb, iCab, Konqueror

{BROWSER_VERSION}

The main browser version detected from user agent. Example: 11, 30

{DEVICE_TYPE}

The device type detected from browser user agent: Possible values: desktop, mobile, tablet

{OS}

The operating system detected from browser User Agent. Possible values: Windows, iOS, Mac, Linux

{IP}

The IP address of visitor. Example: 45.221.56.78

{ONLINE}

Number of real time visitors for current page.