Clearer.io Address Validator

App has worked great for us. Support has been outstanding. We had an issue with some malicious code that we thought was related to this app, but they helped us determine exactly which other code was causing the problem. Don't think I have ever had another app company help us out when it wasn't really their problem.
Would definetly recommend!

While Address Validator Plus offers robust features for address validation, it's important to note that certain functionalities, such as validating addresses during the checkout process, may require a Shopify Plus plan due to Shopify's platform limitations

When creating a custom postal code validation rule, it lets you select language instead of country, even though the dropdown label says "Select Country".

EDIT: the dev team were quick to fix the issue so we're giving 4 stars now.

The app automatically flags incomplete or incorrect addresses during checkout, prompting customers to correct them. This proactive approach has reduced the number of failed deliveries and returned packages.

Works well with Shopify's 1-page checkout. Customizable to fit your store and if you have any issues, support has been great so far. Shout out to Osmand for helping us with a recent address issue!

So far looks great, but had to write a support ticket as under the select country prompt it doesn't allow my customers to use anything but USA I ship internationally and need this fixed or to find a different tool.

But at this point, if you ship internationally, i'd not recommend this tool

Amazing customer support, quick and easy! Got my questions answered without any delay.

Great experience! Osmand helped me and he was very helpful.

This app has been quite helpful in standardizing addresses. We have it operating post checkout - the customer has the opportunity to select the corrected address on the order confirmation page. Overall, I am happy with the results. I would use it again and recommend it to others.

Support is fantastic. I had an issue I needed to be resolved promptly. Osmand from support E-mailed and guided me towards a solution within 5 minutes. Quite impressive.