Shopify keeps each product's COGS as one number in your store's currency. When you buy in yuan, euros or dong, that number goes stale as exchange rates move, and your profit reports drift with it. CostBuffer stores each supplier's invoice amount in their currency, converts it with official exchange rates and updates Shopify's COGS field. It checks rates daily and updates figures that moved, or blends each new purchase with the stock you already hold. Every change is logged.

• Enter supplier invoice amounts in their currency; Shopify's COGS is set for you
• Daily official rates; COGS updates when a rate moves past your threshold
• Use today's rate or a 7, 30 or 90-day mean to smooth out swings
• Blend each purchase with stock on hand, each at its own day's rate
• Add freight and duty, see rate charts and a log of every change with its rate

Shopify's profit reports leave out every sale of a product with no cost per item, and a cost of 0 makes a product look like pure profit. CostGap scans your catalog and last 30 days of orders, shows how much of your sales your reports are missing, and lists every variant that needs a cost. Press Enter to save a cost to Shopify, or give all of a product's variants the same cost in one click. With Pro, see which products, channels, discounts and vendors make money, and test price or cost changes.

• See how much of your sales has no cost recorded
• List every variant with no cost or a cost of 0, top sellers first
• Press Enter to save a cost, or set one cost for all of a product's variants
• Pro: product map, plus margins by channel, discount, vendor and collection
• Pro: test price and cost changes, and see what sold below cost

Every store change is a guess until you check the numbers. EditImpact records changes to your products and compares units sold in the days before and after each one with the products you didn't touch, so a busy week for the whole store isn't credited to an edit. Results show how sales moved after a change and how confident the comparison is. On day one it reads your recent orders, flags sudden jumps and drops, and measures edits you made before installing.

• Records changes to titles, descriptions, photos, collections and product prices
• Compares sales before and after each edit with products you didn't change
• Shows how sure each result is and when other edits overlap
• Flags sudden jumps and drops in a product's sales and the day they began
• Measures edits made before install against your recent order history