We use Postcoder for address lookups, autocomplete and cleaning up addresses. What stands out most is the accuracy, and it was easy to integrate into our systems. We've been using it for a long time - we tried several other providers over the years, but settled on Postcoder. Review collected by and hosted on G2.com.

I'd like to be able to have multiple API keys for different environments (e.g. development, testing and production), so we could keep usage separate between them. Review collected by and hosted on G2.com.