Grow your newsletter.
Land in the inbox.
Free, no-signup tools to write better emails, dodge the spam folder, and know what your list is worth.
Free tools
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Newsletter Revenue Calculator
See what your list earns now — and in 12 months.
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Free Email Spam Word Checker
Find the words sending your emails to spam.
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Free Email Subject Line Tester & Scorer
Score any subject line 0–100 and get instant fixes.
Guides
The Best Email Marketing Tools in 2026 (Honest Comparison)
A no-fluff comparison of the best email marketing platforms in 2026 for creators and small businesses — Kit, GetResponse, beehiiv and Moosend — by price, deliverability and growth features.
27 Email Subject Line Formulas That Actually Get Opens (2026)
Proven email subject line formulas with examples, grouped by the psychology that makes them work — curiosity, specificity, urgency and personalization. Plus a free subject line scorer.