Pro:Tagger is a simply Shopify app for managing tags of your products and customers. That's obviously something you can also do directly in the store admin without any app, but it provides a nice user interface and extra features like auto-tagging.
User interface of the app is clear and using Shopify Polaris design system, so it feels like navigating your native store admin. The dashboard displays two options – product tagging and customer tagging. There isn't unfortunately any overview about your tags, or related statistics.
The biggest advantage compared to the standard (built-in) tagging in Shopify is definitely the automation. It's available only for customer tagging and allows you to tag a customer when certain conditions are met. There are several conditions you can choose from like amount spent, number of orders, date created, placed an order X days ago, etc. You can also combine them together, but keep in mind that all rules need to be met (there is no OR option). What's also great is the feature to automatically remove the tag from the particular customer, if the conditions aren't met anymore.
It's a great solution for tagging your products or customers, and using these tags in the marketing tools later.
The app has a free plan which allows you to add or remove up to 100 tags per month, and set 1 auto-tagging rule. The unlimited plan is $9 per month and lifts all limits compared to the free plan. You can also test the unlimited plan in the 7-day free trial mode.