This is what a simulated queue looks like on a hypothetical website

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After installing the code, windows will pop up on the site, and each visitor will see notifications signaling the flow of buyers on your site.

Services for creating widgets that simulate a queue on a website:

Envybox.io . Trial period – 7 days. 990 rubles mexico telegram database monthly or 8900 rubles per year.
Digital Force . RUB 750 for 3 months, RUB 1,200 for 6 months, RUB 2,028 for 1 year.
Pop-up window
A pop-up form is a pop-up window that appears on a website to attract the visitor's attention and encourage them to perform a target action, such as a purchase, subscription, call, etc. Using this widget requires careful configuration, because a pop-up window can sometimes cause an increase in the bounce rate.

There are two options for pop-up execution:

Hello -board is a pop-up window that partially limits the functionality of the page, but you can still interact with it.
P age-stop - the form blocks the entire page until the user clicks on the action button or closes it.
Commercial sites usually use the latter option, since the user is forced to pay attention to it. It is only important to correctly configure the pop-up window scenario and, having interested the user in your offer, encourage him to make the appropriate request.