Zipprover ‑ ZIPCode Validator

This app is the best zip code checker app with the best support! The support is first class, they have live chat and help to resolve any issue you might have very quickly. It works with zip codes that have letters as well as numbers (like in the UK). It also works for partial zip codes (e.g. NW2) as well as the full code (e.g. NW2 6PP) so if a customer only types the first part it will still works. Other apps don't support this feature. Definitely a recommended app!

This app deserves a Five Star but I was very disappointed when I found out that I could only apply rules at the product level instead of at the collection level. I would think I should be able to add a collection else it will be too much manual work to continue to update the rules with each new product.