Leap Auto Tags | All‑in‑1 Tags

Really useful app! Best way to filter by size for in-stock sizes. This app will automatically add or remove the size tag based on inventory availability. Which makes it possible to take advantage of most theme's filtering functionality (we use Turbo theme) which use tags to add filtering to the front end website. Also, metafields (recently introduced in Shopify 2.0) have typically been unwieldy - it's hard to update product info or tags based on metafields. But with this app, we can use the metafields with confidence knowing that we can create tags from the metafields (indispensable for creating collections and filters).