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.
Allies is a leading provider of address and location technology with over 35 years of experience. Allies is a 100% employee-owned company with a 100% remote team, serving organisations worldwide.