What are some alternatives?
When comparing IP-API.com and ipstack, you can also consider the following products
ipgeolocation.io - Free IP Geolocation API and Accurate GeoIP Lookup Location Database
ipapi - Web analytics with IP address lookup and location API
ipdata.co - Get the Geolocation, Organisation, Currency, Timezone, Calling Code, Flag, Proxy, Tor and Threat intelligence data from any IPv4 or IPv6 address.
IP2Location - IP2Location is a leading provider of IP intelligence service.
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.
WIPmania - WIPmania provides a number of free products and services based on WorldIP geolocation database.