Newsletrix - AI-powered newsletter competitor intelligence

🧰 13 free interactive tools

Free newsletter tools

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.

13 interactive tools Browser-only mostly No signup needed

📝

Subject line tester

Score any subject line on length, urgency, personalisation, emoji, casing.

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⚔️

Subject A/B battle

Paste two subjects, see who wins head-to-head and why - 7 factors.

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📬

Preheader optimizer

Score the joint subject + preheader pairing, with a live inbox preview.

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🪝

Hook tester

Score the first 100 words. Strongest pull and drop-off risk highlighted.

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⚡

Live newsletter counter

Live word count, reading time, Flesch score, link and image counts on every keystroke.

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📈

CTA click predictor

Paragraph + CTA together. Predicted CTR vs. niche median, friction words highlighted.

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📅

Send frequency recommender

Niche + list size + content type → recommended cadence + burnout flag.

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⚖️

Footer compliance

GDPR, CAN-SPAM, CASL, ePrivacy audit of your email footer.

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🔧

Personalisation validator

Find every {{token}} across 6 ESP syntaxes. Catch typos and missing fallbacks.

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♿

Alt-text auditor

Find missing or lazy alt text on every image. Download fixed HTML.

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😀

Emoji finder

Search 3,500+ emoji by name, keyword, sentiment.

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🤖

AI prompt generator

Production-grade prompts for newsletter writing, summarising, repurposing.

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