Stamped.io (also known as Stamped) is a well-established review and loyalty platform popular with mid-market e-commerce brands. Its purchase verification matches reviews to merchant order data — solid, but still merchant-supplied. Here's how it compares to processor-attested verification.
| Capability | Signed Reviews | Stamped |
|---|---|---|
| Verification source | Stripe — independent payment processor. Processor-attested (Level 4). | Merchant order data — matches reviews to orders in the merchant's e-commerce platform. Merchant-supplied (Level 3). |
| Stripe integration | Native — one-click OAuth, read-only. Built exclusively for Stripe. | No native Stripe integration — works through e-commerce platform connectors (Shopify, BigCommerce, etc.). |
| Feature breadth | Focused — core review collection, verification, API, and publishing. | Broad — reviews, ratings, Q&A, loyalty & rewards, community, checkout upsells. Full retention suite. |
| Cryptographic proof | Yes — tamper-evident digital signature on every review. | No cryptographic signing. |
| Pricing | Free plan + $29–$199/mo. Transparent, self-serve. | From $23/mo (Lite) to $149/mo+ (Enterprise). Mid-range but features gated behind tiers. |
| Platform support | Any platform using Stripe — Shopify, WooCommerce, custom, SaaS, invoices. | Shopify, BigCommerce, Magento, WooCommerce. Wide platform support. |
| Review ownership | Business owns the reviews. | Business owns the reviews. |
When to choose Signed Reviews
If verification strength is your priority, the difference between "matched to a merchant order" and "attested by Stripe" is the difference between a marketing claim and an independently verifiable fact. For Stripe-native businesses, Signed Reviews also offers simpler setup (one click vs platform connector configuration).
When Stamped may be a better fit
If you need a full retention suite — reviews + loyalty + rewards + Q&A + community — Stamped's breadth is compelling, particularly for mid-market e-commerce brands that want one platform for everything. The loyalty integration is a differentiator if you're running a points-based retention program alongside reviews.
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Related: What "Verified Buyer" means · Signed Reviews vs Yotpo · Signed Reviews vs Judge.me