We've compared 2 tools across pricing, features, ratings, and reviews to help you make an informed decision. No paid placements — just facts.
Compare different tools →| Feature |  OpenedOrNot Email Marketing | K Klaviyo Email Marketing |
|---|---|---|
| Rating | No reviews yet | No reviews yet |
| Pricing | — |
as of Sep 15, 2026 |
| Pricing Model | Unknown | Freemium |
| Free Plan | ||
| Free Trial | Yes | |
| API Available |
| Verified | Verified |
| Founded | — | 2012 |
| HQ | — | Boston, MA |
| Team Size | Small Business, Mid-market | 1000+ |
| Platforms | — | WebiOSAndroid |
| Top Integrations | Gmail | ShopifyChatGPTClaudeMCP |
| Key Features |
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| Description | OpenedOrNot is a free Gmail email-tracking browser extension (part of the 500apps suite) that tells senders the moment a recipient opens their message, using invisible pixel tracking to log opens, link clicks, read time, location, and device. It's aimed at sales teams, customer support reps, and freelancers who send outbound Gmail and want to know whether messages are actually being read. Its main differentiator is simplicity: green/grey read-receipt ticks and instant open notifications built directly into Gmail rather than a standalone analytics suite. | Klaviyo is the leading marketing platform for ecommerce brands. With unified data from your tech stack, AI-powered insights, and powerful email + SMS automation, Klaviyo helps brands like Patagonia, Living Proof, and SoulCycle grow revenue. |
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