How to Tell If a Website Uses Stamped

Stamped (formerly Stamped.io) is a popular reviews and loyalty platform for ecommerce, combining product reviews and UGC with a rewards programme. Because its widgets load from a dedicated domain and use a distinctive markup prefix, detecting it is straightforward: open a product page and look for assets from stamped.io and stamped-prefixed markup like stamped-main-widget. This guide covers every reliable signal, the platform context, the other review and loyalty apps to distinguish it from, and what Stamped usage tells you about the store and its retention strategy. Because Stamped bundles reviews and loyalty in one platform, recognising it also hints at how the brand prefers to make tooling decisions — favouring a consolidated vendor over best-of-breed apps.

What is Stamped?

Stamped is an ecommerce customer-retention platform spanning two main products: reviews and UGC (collecting and displaying star ratings, reviews, photos and Q&A) and loyalty and rewards (points, VIP tiers, referrals). It is built primarily for Shopify (and integrates with BigCommerce, WooCommerce and others), and it competes with Loox, Okendo, Yotpo and Judge.me on reviews, and with Smile.io and LoyaltyLion on loyalty. Its combined reviews-plus-loyalty offering appeals to DTC brands that want both social proof and repeat-purchase incentives from one vendor.

For detection, the key context is twofold: Stamped is mainly a Shopify app, so finding it usually implies a Shopify store; and its presence indicates a store investing in social proof and retention. Finding Stamped tells you the brand uses reviews (and possibly loyalty) to build trust and drive repeat business. Because Stamped loads from stamped.io and uses stamped-prefixed markup, it is easy to confirm on a product page, and the presence of a loyalty launcher reveals whether the brand uses the rewards module too.

How Stamped loads and renders

Stamped injects its widgets into ecommerce product and other pages, loading assets from stamped.io (and its CDN/API subdomains). Its review widgets use stamped-prefixed markup — most recognisably the stamped-main-widget container for the reviews section, plus a star-rating element (often with data-id, data-product-id and data-widget-style attributes). It outputs review structured data (Review/AggregateRating JSON-LD) for rich results. If the store uses Stamped's loyalty product, a rewards launcher/panel also loads from Stamped.

On Shopify, the store shows Shopify signals (cdn.shopify.com, Shopify markup) alongside Stamped. The combination of stamped.io assets, stamped-prefixed widget markup, and the ecommerce platform is the reliable pattern, with the review schema and any loyalty launcher as corroboration. Knowing these — the stamped.io assets, the stamped-main-widget and stamped- markup, the review schema, and the platform context — makes detection quick.

How to tell if a website uses Stamped

Confirm at least one strong signal (a stamped.io request suffices).

1. Check the Network tab. On a product page, filter for stamped. Assets from stamped.io (and its CDN) confirm Stamped.

2. Inspect the review widget. Look for stamped-prefixed markup — the stamped-main-widget container and a star-rating element with data-widget-style/data-id.

3. View the source. Search for stamped. The widget markup and stamped.io references are usually visible.

4. Check for loyalty. A rewards/loyalty launcher loading from Stamped indicates the loyalty module is in use too.

5. Confirm the platform. On Shopify, the store shows Shopify signals — a coherent pairing; on other platforms, the stamped.io assets still confirm Stamped.

What the Stamped signals look like

GET https://stamped.io/...   ;   GET https://cdn-stamped-io...   (widget assets / review data)
<div id="stamped-main-widget" data-product-id="..." data-widget-style="standard"></div>
<span class="stamped-badge" data-id="..."> … stars … </span>
<script type="application/ld+json">{"@type":"AggregateRating", …}</script>

Requests to stamped.io rendering stamped-prefixed widgets are conclusive.

Stamped versus other review/loyalty apps — avoiding false positives

Match the domain and markup prefix to keep apps distinct. Stamped uses stamped.io and stamped-prefixed markup; Loox uses loox.io; Okendo uses okendo.io and oke- markup; Yotpo uses yotpo.com; Judge.me uses judge.me. For loyalty specifically, Smile.io and LoyaltyLion are dedicated loyalty apps with their own domains, so a Stamped loyalty launcher is distinct from those. The stamped.io domain and stamped- prefix are characteristic. As with other product-review apps, Stamped is on-site product reviews, distinct from independent company-reviews platforms like Trustpilot — a store may run both. The presence of Stamped's loyalty module distinguishes a broad deployment from reviews-only usage.

How reliable is each Stamped signal?

Requests to stamped.io (and its CDN) and stamped-prefixed widget markup are definitive. The review structured data corroborates. The platform context (usually Shopify) reliably accompanies it. A Stamped loyalty launcher indicates broader usage. The weakest situation is a widget that lazy-loads below the fold, so scroll the product page — but the stamped.io assets usually load with the page. As a rule, a stamped.io request or the stamped-main-widget markup settles it, and a loyalty launcher reveals whether the rewards module is also in use.

What Stamped usage reveals about a store

Finding Stamped signals an ecommerce store (usually Shopify) investing in social proof and retention. Its combined reviews-and-loyalty offering means its presence can indicate a brand using both trust-building reviews and repeat-purchase incentives from one platform — a sign of a retention-focused operation. Finding it tells you the store takes reviews seriously and may run a loyalty programme. The platform tells you the ecommerce stack; the presence of the loyalty module indicates retention investment. If you sell ecommerce tools — CRO, retention, loyalty, UGC, email/SMS — a Stamped store is a fit, retention-conscious DTC prospect. The choice of Stamped (reviews + loyalty in one) over separate best-of-breed apps specifically signals a brand that values consolidation, a small but useful preference signal.

What finding Stamped means for sales, agencies and competitive research

For sales and prospecting, Stamped marks a retention-focused ecommerce store investing in reviews and possibly loyalty — a fit for retention, loyalty, UGC and ecommerce tools. The loyalty module indicates repeat-purchase focus.

For agencies and consultants, finding Stamped tells you the client values social proof and retention, so engagements can optimise reviews, loyalty, or the wider retention funnel. It signals a store comfortable running conversion-and-retention apps.

For competitive and market research, Stamped versus separate reviews/loyalty apps reveals whether a competitor consolidates or uses best-of-breed, and its adoption maps retention strategies across DTC brands in a niche.

Stamped in the wider DTC stack

Stamped sits in the social-proof-and-retention layer of an ecommerce stack. It accompanies a Shopify (or other) store, Klaviyo (email/SMS, often integrated with Stamped reviews and loyalty), conversion apps, a theme, and acquisition pixels. Stamped's loyalty and review-request flows may coordinate with Klaviyo. For an auditor, the valuable details are confirmation of the platform, whether Stamped's loyalty module is in use, the presence of Klaviyo and other DTC tools, and the review schema; together these reveal a retention-focused store and the breadth of its trust-and-loyalty strategy. The most useful inference from a Stamped detection is the consolidation signal: because Stamped offers reviews and loyalty in one platform, a store running it has often chosen to buy both capabilities from a single vendor rather than assembling best-of-breed apps. That tells you something about how the brand makes tooling decisions — favouring simplicity and a unified vendor relationship — which is useful context when positioning a product, since a consolidation-minded buyer weighs an all-in-one offering differently from a brand that deliberately stitches together specialised tools. Checking whether the loyalty module is actually active sharpens that read further.

A quick Stamped confirmation walkthrough

Open a product page with developer tools on the Network panel and filter for stamped. Assets from stamped.io (and its CDN) confirm Stamped. Inspect the reviews section for the stamped-main-widget container and stamped-prefixed star-rating markup with data-widget-style. Check for AggregateRating JSON-LD and a loyalty/rewards launcher. Confirm the platform (usually Shopify). The stamped.io requests or the stamped-main-widget markup confirm Stamped.

A quick Stamped detection checklist

• On a product page, filter the Network tab for stamped; stamped.io requests are conclusive.
• Inspect the reviews section for stamped-main-widget and stamped- markup.
• Check for Review/AggregateRating JSON-LD output.
• Look for a Stamped loyalty/rewards launcher (broader usage).
• Confirm the ecommerce platform (usually Shopify).
• Distinguish Stamped (stamped.io) from Loox (loox.io), Okendo (okendo.io) and Yotpo.

Detecting Stamped at scale

Checking one store is quick, but mapping reviews-and-loyalty-app adoption across many ecommerce domains — to find and segment retention-focused brands — calls for automation. StackOptic detects Stamped and thousands of other technologies from a real browser, reading widget assets, markup and schema. For related reading, see our guides to telling if a website is built with Shopify and getting more Google reviews, and the full Stamped technology profile.