What is a flash sale?

A flash sale is a sale that lasts only a short period of time, and often products of services are sold at greatly reduced prices.

How to add a flash sale countdown timer

When you are on your dashboard you’ll want to click on the ‘+ Add Skill’ button. This will open a box that shows you all of the possible skills you can add to your eCommerce site. Search for the skill by typing ‘timer’ or scroll until you find the one called “Show Product Sale Countdown Timer’.

How to edit and customize the flash sale timer

Now comes the fun part-customizing your flash sale countdown timer to look and act the way you want it to! The skill is divided into 5 tabs including Location, Content, Design, Behavior, and Conditions.


This tab lets you decide where to show the content in your Shopify pages. You can choose the page or pages for the timer to appear on. By default this will be on ‘product view pages’.

The ‘Location on page” selector allows you to choose where the timer will appear. You can use the drop-down to choose for them to appear: right after, right before, beginning of, end of, or replace a certain section on your site. When you click “Change Location” you get to choose where you want the skill to appear on your site using the live preview window.

You’re also able to add filters to your skill. This allows you to show the skill to only those who have come from a referral URL for example, or those with a certain URL param.


This tab lets you choose what content to show to your customers. The Content tab lets you determine the message to display on your product page(s). Check out this article for editing the timer template. You can also choose the date and the time for the timer to countdown until. This will be when the sale is over. Try choosing a date that isn’t far away as this will increase urgency and have customers buy now instead of waiting. That’s what makes it a ‘flash sale’.


The design tab lets you choose the colour, size of the font and other details for how the timer will look on your site. The custom CSS tab is for your engineers or coders to use if they want to get even more creative in editing and modifying the timer.


The custom JS tab is for your engineers or coders to use if they want to edit and modify the behavior of the timer.


This tab lets you decide when to show your countdown timer. You can set specific triggers and conditions here. This is great if you only want the timer to show on certain products (maybe only those in a specific collection are on sale) or to only customers from a certain country.

A/B testing

This tab lets you decide if you want to A/B test your Shopify testimonial notifications. It’ll allow you to enable or disable testing and also determine the percentage split of who to show the content to. The default is a 50/50 split, meaning 50% of the time customers see the testimonials, and the other 50% do not see the testimonials. This data can be used to compare to each other and determine whether the skill is helping you out.

By default, this skill is turned off. You can enable it yourself and also find out more about A/B Testing through this article.

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