Want to boost your email open rates? It all starts with a great subject line.
This tool gives you instant feedback on your email subject line using proven best practices from Spotler and leading industry experts. Simply enter your subject line in the field below and receive:
No fluff. No distractions. Just a focused review of your subject line.
Email marketing held its ground in 2025. Open rates edged upward, click behaviour recovered, and marketers spread their campaigns more evenly across the year.
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Your emails aren't just being opened or ignored anymore. They're being interpreted, summarised, and judged by AI before a human even sees them.