Any Proxy checker tool please?

[Foxfire]

Hey guys,
Would like to choose a reliable Proxy checker solution and need your help.
I'd like to detect if I am using a proxy server or not.
I found whatismyip site and they offer this solution.
Have you ever used them before?

Thanks.

[hostjelly]

Try GSA Proxy Scraper

[Host.co.in]

Go through Hidemy.Name Proxy Checker – Best Socks5 Proxy Checker

[Sophiaparker]

Geonode Proxy Checker