Post-purchase attribution survey tools compared
Fairing, KnoCommerce, Zigpoll, Grapevine and le Guide Henri, compared feature by feature and price by price, for PrestaShop and WooCommerce stores.
Prices and features collected from the vendors' websites (pricing pages, app listings, help centres): Fairing (fairing.co/pricing), KnoCommerce (knocommerce.com/pricing), Zigpoll (zigpoll.com/pricing), Grapevine (apps.shopify.com/grapevine), collected on October 19, 2026 and October 21, 2026. Public entry offers, prices excluding VAT, which may have changed since. “—”: information not found.
What is an attribution survey?
An attribution survey asks the customer one question right after their purchase, on the order confirmation page: “How did you hear about us?”. The answers reveal the channels that really bring customers — word of mouth, podcasts, trade shows, Instagram — including those that click-based analytics cannot see. Because each answer is linked to its order, revenue and average basket can be calculated per channel.
Prices and plans
Free plan, entry price, commitment and supported stores. Most survey tools are built for Shopify: none has a PrestaShop or WooCommerce module.
| le Guide Henri | Fairing | KnoCommerce | Zigpoll | Grapevine | ||
|---|---|---|---|---|---|---|
| Free | Paid | |||||
| Free | 40 orders/month | 200 transactions/month | no (7-day trial) | 50 responses/month | 14-day trial | |
| Entry price | €0 | €20 excl. VAT/month | $49/month | $19/month | $29/month | $25/month |
| Commitment | none | — | — | — | — | |
| PrestaShop / WooCommerce | ✓ / ✓ | ✗ / ✗ | ✗ / ✗ | code to paste | ✗ / ✗ | |
| Shopify | ✗ | ✓ | ✓ | ✓ | ✓ | |
Features, tool by tool
Follow-up questions, targeting, languages, analytics, reminders, integrations, API and MCP. At Fairing, several of these are $99/month add-ons; at le Guide Henri they are in the free plan, except sending data to your tools.
| le Guide Henri | Fairing | KnoCommerce | Zigpoll | Grapevine | ||
|---|---|---|---|---|---|---|
| Free | Paid | |||||
| Follow-up questions | included | $99/month add-on | — | ✓ | ✓ | |
| Targeting | included | $99/month add-on | Pro plan | ✓ | ✓ | |
| NPS in the survey | included | $99/month add-on | paid add-on | ✓ | ✓ | |
| Answer classification | rules | $99/month add-on | — | AI | — | |
| Languages | 14 | paid add-on | — | auto translation | several | |
| Ready-made questions | 27 templates + 157 questions | 25+ | templates | AI generator | templates | |
| Declared × measured | ✓ | via UTM | — | — | — | |
| Email / SMS reminder | ✗ | ✓ | — | ✓ | ✓ | |
| Integrations (Klaviyo, GA4, Meta…) | ✗ | ✓ | ✓ | 2 to 4 depending on plan | ✓ | ✓ |
| API | ✗ | ✓ | ✓ | ✓ | ✓ | — |
| Official MCP | ✗ | ✓ | ✓ (beta) | ✗ | ✓ | ✓ |
| Weekly AI summary | ✗ | ✓ by email, all plans | ✗ | ✓ | ✗ | |
| Reviews + survey, one tool | ✓ | ✗ | ✗ | ✗ | ✗ | |
The tools compared
le Guide Henri
Free up to 40 orders a month, with follow-up questions, targeting, NPS in the survey, 27 templates, a bank of 157 questions, 14 languages and analytics (revenue, average basket, declared versus measured channel). On the paid plan, from €20 excl. VAT a month: answers sent to Klaviyo, Brevo, GA4, Meta or a webhook, reminders, Fairing-compatible API and MCP. PrestaShop 1.7 to 9 and WooCommerce modules, customer reviews in the same tool.
Fairing
The reference post-purchase survey on Shopify. Free up to 200 transactions a month, then from $49 a month; follow-up questions, targeting, NPS and answer classification are $99/month add-ons. Integrations, API, MCP in beta and a weekly AI summary by email. No PrestaShop or WooCommerce module.
Fairing alternativeKnoCommerce
Post-purchase survey for Shopify, from $19 a month after a 7-day trial. Targeting in the Pro plan, NPS as a paid add-on, reminders, 2 to 4 integrations depending on plan, API. No PrestaShop or WooCommerce module, no MCP.
KnoCommerce alternativeZigpoll
Free up to 50 responses a month, then from $29 a month. Follow-up questions, targeting, NPS, AI classification, automatic translation, reminders, integrations, API and MCP. On PrestaShop and WooCommerce, a code has to be pasted into the store.
Zigpoll alternativeGrapevine
Shopify app, $25 a month after a 14-day trial, unlimited responses. Follow-up questions, targeting, NPS, several languages, email reminders, integrations and MCP. No PrestaShop or WooCommerce module.
Grapevine alternative
Key takeaways
- No competing attribution survey tool has a PrestaShop or WooCommerce module: they are all built for Shopify.
- What Fairing sells as $99/month add-ons (follow-up questions, targeting, NPS, answer classification) is included in le Guide Henri's free plan.
- le Guide Henri is the only one to compare the channel declared by the customer with the channel measured by your tools.
- le Guide Henri combines the attribution survey and customer reviews, with a single order counter.
Method and sources
Each value comes from the vendor's pricing page, app listing or help centre, checked on 19 and 21 October 2026. “—” means the information was not found; “✗” means the feature does not exist. Dollar prices are those shown by the vendor. le Guide Henri is shown in two columns: free plan and paid plan.
Sources: fairing.co/pricing · knocommerce.com/pricing · zigpoll.com/pricing · apps.shopify.com/grapevine · docs.fairing.co · docs.grapevine-surveys.com