What are some alternatives?
When comparing ipstack and ipdata.co, you can also consider the following products
ipapi - Web analytics with IP address lookup and location API
ipinfo.io - Simple IP address information.
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.
ipgeolocation.io - Free IP Geolocation API and Accurate GeoIP Lookup Location Database
IP-API.com - Free IP Geolocation API - lookup any IP address