Every Newsletrix interactive tool in one place. Each one takes input - text, HTML, a domain - and returns a result instantly. No signup, no rate-limit traps. Looking for explainers and benchmarks? See our guides.
Score any subject line on length, urgency, personalisation, emoji, casing.
Open tool →Paste two subjects, see who wins head-to-head and why - 7 factors.
Open tool →Score the joint subject + preheader pairing, with a live inbox preview.
Open tool →Live word count, reading time, Flesch score, link and image counts on every keystroke.
Open tool →Paragraph + CTA together. Predicted CTR vs. niche median, friction words highlighted.
Open tool →Niche + list size + content type → recommended cadence + burnout flag.
Open tool →Find every {{token}} across 6 ESP syntaxes. Catch typos and missing fallbacks.
Open tool →Production-grade prompts for newsletter writing, summarising, repurposing.
Open tool →Our guides cover spam triggers, CTA strength, readability, ESP detection, and best send time - with niche-calibrated benchmarks for each.
Join newsletter creators using AI-powered competitor intelligence to ship better content, faster.
No credit card required · Cancel anytime · All features on every plan