Free tools
Tools we need every week ourselves.
Small helpers for your newsletters, built by the team behind Reyo. Free, no sign-up, and we store nothing you enter.
Newsletter
Test subject lines, check HTML, find emojis.
A/B Test Calculator
Did subject line B really win, or was it chance? Enter opens or clicks and get the answer in one line.
Subject Line Emojis
Emojis sorted by occasion, from sale to Mother’s Day. One click copies, the preview shows how it looks in the inbox.
Email HTML Preview
Paste HTML and see how the newsletter looks on desktop, phone and in dark mode. With a check for common mistakes.
Deliverability
Check spam risk and see what competitors send with.
And what are your competitors sending?
Reyo reads your competitors’ newsletters, push notifications, Meta ads and websites and tells you what to do about them.