Subject Line Grader
Score your subject lines against spam triggers, length, and personalization — instantly.
Deliverability Checker
Check your domain's SPF, DMARC, and DKIM records instantly.
List Health Check
6 quick questions, one clear score for how healthy your list really is.
Send Time Optimizer
Get a recommended send day and time based on your industry and timezone.
Spam Word Checker
Check your full email body for spam-trigger words before you hit send.
Unsubscribe Rate Calculator
See how your unsubscribe rate compares to industry benchmarks.
Glossary
Plain-English definitions for every retention marketing term you'll run into.
Referral Program
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Choosing a Retention Marketing Platform: What Actually Matters
A practical framework for evaluating email and SMS retention platforms, past the feature-comparison marketing pages, for small and mid-sized e-commerce brands.
3 min readEmail Deliverability in 2026: Staying Out of the Spam Folder
Gmail and Yahoo enforce a hard 0.3% spam complaint ceiling for bulk senders. A practical guide to authentication, list hygiene, and staying compliant in 2026.
3 min readEmail Segmentation That Actually Moves Revenue
Most segmentation advice stops at demographics. Here are the segments that actually change conversion rates, and how to build them without overcomplicating your flows.
3 min readLifecycle Marketing 101: Mapping Flows to the Customer Journey
Lifecycle marketing means matching the right message to the right stage of the customer relationship. A practical map from first visit to loyal repeat buyer.
3 min readLoyalty Programs for E-commerce: Structure, Tiers, and ROI
A practical guide to building a loyalty program that changes repeat purchase behavior, not just a points balance nobody redeems.
3 min readPost-Purchase Emails: Turning One-Time Buyers Into Repeat Customers
Post-purchase is the most underused flow in e-commerce email. A guide to the sequence that builds reviews, reduces returns, and drives the second purchase.
3 min read