EmailSignal — Klaviyo Campaign Preflight

Catch campaign mistakes in the content your recipient would actually see. EmailSignal runs a deterministic preflight on the currently rendered email preview after you click Scan. Use it on a rendered Klaviyo preview, the visible message in Gmail, or a public browser preview. Checks include: - unresolved personalization and template tokens; - coupon and date placeholders; - empty, JavaScript, localhost, staging, test, and HTTP links; - missing or inconsistent campaign UTMs; - duplicate destinations and a complete link inventory; - meaningful images missing alt text or stable dimensions; - unsubscribe, preference-center, footer, and address signals; - preheader length, CTA clarity, and rough text-to-image balance. Export the sanitized result as JSON or CSV for campaign sign-off. Privacy by design: - scans only after a user action; - reads only the current rendered content; - does not modify the page; - does not send network requests to audit links or images; - redacts concrete emails, phone numbers, and non-UTM query values; - requests no persistent host access and no <all_urls> permission. Important: EmailSignal is a preflight assistant. It does not guarantee deliverability, inbox placement, accessibility, or legal compliance and is not legal advice. Free plan: five scans per month. Paid Solo and Agency annual plans unlock unlimited scans through SignalSuite license activation.