Maybe just open it and have a look?

The text covers a lot of ground very quickly omitting a lot of "pure math" details.

Well, Tor is usually blocked. If you want something more reliable, use private proxy services, for example https://gimmeproxy.com

How is it different from lodash?

This one is also worth mentioning: https://senso.me/

You could use https://ip-api.io to detect proxies/tor/etc

Great job, we have similar service https://ip-api.io - ip geolocation and ip intelligence / abuse prevention

Nice work! I really like how the website looks - so uncluttered and minimalist.

I second this, we use Paddle on https://gimmeproxy.com . It's really nice they handle VAT automatically on your behalf (EU VAT law for online is complicated) and setup was pretty easy.

Gimmeproxy is exactly what I was looking for. No need to search now!

Is GimmeProxy intended for blocking proxies or utilizing them?

It's for utilizing proxies. For blocking you can use something like https://ip-api.io

Yes, that's how appointment is called in German. I must admit it sounds a little weird, but hopefully would work for SEO.

By the way, the app is done with TypeScript and React Native/Redux.

Seems like a copy of https://www.tiltmaps.com/

There are a lot of websites like this. First and most successful being http://mapiful.com.

As much as tiltmaps.com is a copy of google maps.