OPTIS Product Options, Variant

I used this app to add colour swatches to our products as the number of variants allowed in Shopify did not meet our requirements. This app is easy to use and understand and helped us create a solution that did not require excessive cost and time spent on it. The support for the app is excellent, with special mentions to Josephine Dao who has been a great help with answering our requests quickly and to the dev Son PT, Huy NT, Duong ND who have made some changes to the front end of the app so it fits our requirements.