Cool& Post Purchase Survey vs SizeEcho
Two Shopify apps, side by side: detected stores, momentum, reviews, plans, listed features and who runs each. Store counts as of Nov 3, 2026 for Cool& Post Purchase Survey, Nov 13, 2026 for SizeEcho.
The short answer
- Both list a free plan. Paid plans start at $14/month for Cool& Post Purchase Survey and $29/month for SizeEcho.
- Cool& Post Purchase Survey lists 6 features SizeEcho’s listing doesn’t mention, including Drag-and-drop editor, Embedded forms, Market research.
Head to head
Free
- · 50 responses / month
- · Analytics
- · Klaviyo profile sync
- · Ready-made recipes
- · Revenue and AOV per answer
- · Shopify Flow trigger
Starter
- · 1,000 responses / month
- · Analytics
- · Klaviyo profile sync
- · Ready-made recipes
- · Revenue and AOV per answer
- · Shopify Flow trigger
Unlimited
- · Analytics
- · Klaviyo profile sync
- · Ready-made recipes
- · Revenue and AOV per answer
- · Shopify Flow trigger
- · Skip logic and live preview
Free
- · 75 fit responses / month
- · Overview, Products, Sizes
- · Requires Klaviyo
Core
- · 500 fit responses / month
- · Overview, Products, Sizes
- · Requires Klaviyo
Scale
- · 2,500 fit responses / month
- · Product CSV export
- · Recipe pack for Flows
- · Requires Klaviyo
- · Size watchlist + thresholds
Coverage counts what each App Store listing names. Every feature, checked off app by app, is in Shoplist.
See every featurePost Purchase Survey adds a short survey to your Thank You page, shown after an order is placed. Ask how customers heard about you, why they bought or what almost stopped them, using multiple choice, checkbox, dropdown or open questions. Each answer is saved with its order and the customer's email, so you can compare marketing channels by orders.
SizeEcho shows apparel merchants which products and sizes run too small, true to size, or too big, using buyer answers after an order ships. After fulfillment it waits a delay you set, then sends one event to Klaviyo. Your Klaviyo Flow emails the fit check-in. Answers land in Overview, Products, and Sizes so you can improve size guides and product copy. Requires Klaviyo. SizeEcho does not email buyers itself.
- Add a survey to your Thank You page without editing your theme or checkout
- Ask multiple choice, checkbox, dropdown and open questions
- See every answer with its order and the customer's email
- Show each customer the survey in their own language
- See which products and sizes run small or large from buyer fit answers
- After shipping, send a fit check-in through your Klaviyo Flow
- Buyers pick too small, true to size, or too big (optional reasons)
- Review answers in Overview, Products, and Sizes to fix size guides
All the numbers
Every figure, side by side
A green dot marks the app ahead on a measured figure. Estimates, gaps and apps that leave no storefront trace never take the lead.
Adoption
| Measure | Cool& Post Purchase Survey | |
|---|---|---|
| Detected stores | Not published | Not published |
| Net store change, 28 days | 0 | Not enough data |
| Stores added, 28 days | Not enough data | Not enough data |
| Big-brand share | Not enough data | Not enough data |
| Top store categories | Not published | Not published |
| Top store countries | Not published | Not published |
Reviews
| Measure | Cool& Post Purchase Survey | |
|---|---|---|
| App Store rating | 5.0 ★ | Not published |
| App Store reviews | 9 | Not published |
| New reviews, 28 days | Not enough data | Not enough data |
| Reviewers a year or more in | Not enough data | Not enough data |
Pricing
| Measure | Cool& Post Purchase Survey | |
|---|---|---|
| Free plan | Yes | Yes |
| Lowest paid monthly plan | $14/month(ahead) | $29/month |
| Longest free trial | Not listed | Not listed |
| Plans listed | 3 | 3 |
Listing
| Measure | Cool& Post Purchase Survey | |
|---|---|---|
| Shopify category rank | #17 | Not enough data |
| Shopify App Charts | Not on this week’s charts | Not on this week’s charts |
| Built for Shopify | No | No |
| Launched | Oct 21, 2026 | Nov 13, 2026 |
| Languages | 1 | 1 |
| Developer | Peter Coolen Creative Developer | SizeEcho |
FAQ
Cool& Post Purchase Survey and SizeEcho: common questions
- Is Cool& Post Purchase Survey or SizeEcho cheaper?
- Both list a free plan. Paid plans start at $14/month for Cool& Post Purchase Survey and $29/month for SizeEcho. Shoplist compares base prices only between monthly plans in the same currency; usage charges and annual plans vary, so check each plan’s limits.
- What features does each app list that the other doesn’t?
- Cool& Post Purchase Survey lists 6 the others don’t mention, such as Drag-and-drop editor, Embedded forms, Market research, Multi-language. SizeEcho lists 2 the others don’t mention, such as Analytics dashboard, Email. A feature missing from a listing may still be supported; this compares what each App Store listing says.
- Where does this comparison’s data come from?
- Shoplist crawls Shopify storefronts to detect which apps each store runs, and reads each app’s Shopify App Store listing for reviews, pricing, features and integrations. Store counts are as of Nov 3, 2026 for Cool& Post Purchase Survey, Nov 13, 2026 for SizeEcho; estimated figures are labeled.
How Shoplist compares apps
Store counts come from Shoplist’s crawl of Shopify storefronts, which detects the apps each store runs; they are as of Nov 3, 2026 for Cool& Post Purchase Survey, Nov 13, 2026 for SizeEcho. Reviews, ratings, plans, features and integrations come from each app’s Shopify App Store listing. 28-day figures are labeled when estimated, and a figure that is missing or estimated never decides who leads. Read the methodology.