Free
$0
75 completed responses / month
Post-purchase fit for apparel
See which products and sizes run small or large after shipping
Buyers tell you how the order fit once it has shipped. SizeEcho lines those answers up by product and size, so a size that keeps running small is easy to spot — without guessing from returns alone.
Self-serve on the Shopify App Store. No sales calls.
Needs attention
Merino crew
Size M
Leans too small
Too small is the common answer on this size.
- Too small
- True to size
- Too big
How it works
One check-in after the order ships.
- 1
Wait, then signal once
After fulfillment, SizeEcho waits the number of days you choose, then sends one event to Klaviyo for that order — even if the order had more than one fulfillment.
- 2
Klaviyo asks the buyer
Your Flow emails a short fit check-in: too small, true to size, or too big. Optional reasons include tight, loose, short, long, narrow, or wide. SizeEcho does not email buyers itself.
- 3
Read it by size
Answers show under Overview, Products, and Sizes. Use them to fix a size guide or the product description when the same size keeps coming back off.
Pricing
Plans follow completed responses.
Free and Core use the same screens. Scale adds the watchlist, export, and recipe pack. You change plan in the app. Shopify does the billing.
Core
$29/ 30 days
500 completed responses / month
Scale
$79/ 30 days
2,500 completed responses / month
- Size watchlist with threshold flags
- Product CSV export
- Recipe pack for follow-up Flows
Billing uses Shopify Billing. SizeEcho does not store card data. A Klaviyo account is required, and Klaviyo pricing is separate.