What are some alternatives?
When comparing IP-API.com and Geo IP Tool, you can also consider the following products
ipgeolocation.io - Free IP Geolocation API and Accurate GeoIP Lookup Location Database
ipdata.co - Get the Geolocation, Organisation, Currency, Timezone, Calling Code, Flag, Proxy, Tor and Threat intelligence data from any IPv4 or IPv6 address.
ipstack - ipstack is a free, real-time IP address to location JSON API and database service supporting IPv4 and IPv6 lookup.
IP2Location - IP2Location is a leading provider of IP intelligence service.
whatismyip.cc - External IP Address lookup tool with option to scan the external IP address.
Ipregistry - Ipregistry is a fast, reliable IP geolocation and threat data API. People use Ipregistry to personalize content, analyze traffic, target ads, block countries but also to prevent abuse by detecting Proxy and Tor users, known spammers and bad bots.