Very Easy to use -- you specify a discount rate you'd like to offer, the app mass updates all the prices and compare-at for you automatically. This way, on the storefront, potential customers will see the discount vs strikethrough pricing.

• Bulk Price Change: Mass update prices for up to millions of products at once.
• Unlimited Price Updates: Update as many time as you'd like, with any plans
• Flexible Discount Rules: Create custom pricing strategies based on collections.