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Proton
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SimpleLogin lets you send and receive emails anonymously via easily-generated unique email aliases.
It’s fine to check your IP, but that site does not say anything about proton. I’m specifically asking for something more in my OP.
Proton should, but they're not the only ones who can. They've done the hard work by providing an API, which I linked earlier ( https://api.protonmail.ch/vpn/logicals ). That API is the only piece that Proton needs to keep updated and working, but anyone can compare their own IP (or someone else's IP who connects to them) against that API....and it's already built.
It's super simple for someone (ideally Proton) to set up a website. Websites already grab the IP of who connects to them, then they just run that IP against that API and just have a green banner that says their connected via which exit, or red banner with ISP and IP. And you can get fancier from there.
I mean, I'm not a web dev, but I could set that up in less than a day. I'm also not a UI/UX person, so it would also look awful.
I agree, but you really want Proton to run the site themselves to trust it and know that it’s updated and working.
I’d be interested in building a site like that. Don’t have a need for it personally but it could be useful for the community