Show HN: Watch Newsletters by AI

A new Show HN project called Watch Newsletters by AI offers six AI-powered modules that analyze competitor email newsletters to produce prioritized recommendations, subject-line intelligence, send-time patterns, campaign forecasts, CTA and link analysis, and SWOT reports. The tool reports benchmarks including an average subject length of 33 characters, an average open rate of 20.1% (4.4 points above the 15.7% industry figure), and a subject-length-to-open-rate correlation of r = -0.29 across 149 analyzed subject lines. It also surfaces per-brand send-time recommendations, such as Wednesday 19:00 UTC for Kongessloejd at an 18.0% average open rate and 3.50% CTR across 3 sends, flagged as medium confidence.

Six AI-powered modules built to turn competitor newsletters into a daily strategic edge. Recommendations with no fluff Specific, prioritized actions you can ship today - not generic "best practice" advice. Every suggestion is grounded in patterns we found across the newsletters you track. Prioritized content suggestions Design and structure improvements Engagement-driving tactics AI-drivenAutomated Most common recommendations Top themes across all analyzed newsletters Example use cases: Regional promotions plan by city, with a localized banner per region. 3-email welcome series in Klaviyo with discount + featured products. Improve accessibility & mobile optimization Example use cases: Add descriptive alt text to every product image. Add a skip-to-content link at the top of the email. Incorporate social proof on featured products Example use cases: Show 4.8 star average + total reviews near the CTA. Live activity ticker - recent verified buyers. Top priority recommendations Start here. High-impact changes that move the needle. High impact Add countdown timer and explicit end time 1 newsletter High impact Personalized recs based on past purchases 1 newsletter High impact Time-limited offers or bundle pricing 1 newsletter Subject line intelligence Decode what makes subject lines actually open. Length, sentiment, keyword density, emoji impact - across every newsletter you track, side by side. Sentiment and tone analysis Keyword effectiveness benchmarks Emoji usage patterns SentimentKeywords Key insights 191.3% of subject lines have "Neutral" sentiment 2"Where Stories Come to Life" appears 5x as the most repeated subject 3"easter" is the top keyword across 17 subject lines Total subjects 149 Avg length 33 chars Avg sentiment 0.09 Avg open rate 20.1% +4.4 pt vs. industry Subject length vs. Est. open rate r = -0.29 NewslettersTrendIndustry 15.7% Date & time distribution See exactly when your competitors hit inboxes. Spot the gaps in their schedule - and the windows where your sends will stand out. Send-time pattern visualization Frequency & cadence benchmarks Optimal-window suggestions TimingPatterns Best time to send Per-brand recommendation. The day, hour bucket with the highest avg open rate, weighted by sample size. Kongessloejd Medium confidence Wednesday 19:00 UTC Avg open: 18.0% · CTR: 3.50% · 3 sends kongessloejd Thin sample Tuesday 18:00UTC CTR: 8.00% · only 3 sends · busiest cell ⚠Treat as a starting hypothesis until ≥ 3 sends per bucket. Hour × day-of-week heatmap Times in UTC · Peak: Tue @ 18:00 3 sends 036912151821 Mon2Tue4Wed5Thu2Fri1Sat5Sun3 QuietBusy Campaign analysis & forecast See exactly when competitors run their seasonal campaigns. Spot discount patterns, recurring promo windows, and the calendar gaps where their inboxes go quiet - so yours can stand out. Seasonal campaign timelines Discount & promo pattern detection Brand calendar with forecast windows CalendarForecast Campaign calendar Each bar is a campaign window per brand, colored by season. Filter by brand or season to compare. Spring 20265summer5Winter5Easter4Spring4Spring/Summer3spring2holiday1 Brand 2/263/264/265/26 Rockahula Kids Spring · 3 Sp/Sum summer · 5 Donsje spring · 3 summer · 2 Donsje Amsterdam summer · 6 Kongessloejd Spring 2026 · 11 Spring · 2 Mimi & Lula Spring · 2 summer · 3 Konges Sløjd Summer · 3 CTA & link analysis Every CTA classified by intent, placement, and destination. Understand what competitors are pushing - and how often it's actually working. CTA strength & placement scoring Destination & UTM mapping Link density benchmarks CTAsConversion Top performing newsletters with CTA positions Fresh as a Daisy 🌹 Rockahula KidsCTR Est. : 25.0% top hero collection promos top heroafter each productcollection promosfooter Strategic SWOT analysis A board-ready Strengths / Weaknesses / Opportunities / Threats breakdown for any competitor - generated from their actual newsletter content, not vibes. Competitor strengths & weaknesses Open opportunities for you Emerging threats to watch StrategyRecommendations Strengths 6 items 1new collection focusP51× 2clear call to action optionsP51× 3free delivery offerP51× 4extensive dress-up accessory rangeP51× Weaknesses 6 items 1text link heavyP51× 2no image contentP51× 3no explicit pricesP51× 4too many CTAs may overwhelm recipientsP51× Opportunities 9 items 1Add a clean hero image, product grid and visible pricesP320% 2test variants with personalization and urgencyP320% 3Consolidate CTAs into a clear path with UTM trackingP315% 4reduce to top 3 CTAs and group linksP312% Threats 9 items 1no alt text for imagesP51× 2no hero imageP51× 3no explicit product thumbnailsP51× 4no visible price informationP51× Content deep dive & keywords Readability scores, structure, link density, topic clustering. See which themes resonate - and which to walk away from - across your industry. Readability & structure scoring Topic & keyword clustering Engagement pattern detection ReadabilityKeywords Word cloud · Top keywords Most frequent keywords in the period with week-over-week change. Plug Newsletrix straight into ChatGPT, Claude, or Cursor with the Model Context Protocol. Your assistant queries your real newsletter analytics on demand - no exports, no copy-paste, no hallucinated numbers. Assistant: 14 sends across 6 brands. Acme ran a discount, Vega launched a product, Linnea went quiet. Top recommendation: tighten subject lines <40 chars. All features on every plan · No credit card for free plan · No contract · Cancel anytime Comparison Newsletrix vs. manual analysis The same analysis. A fraction of the time. Task Manual spreadsheet Newsletrix Collect 50 newsletters 2-3 hours Automated Extract subject lines 30 minutes Instant Count and classify CTAs 1 hour AI-powered Analyze sentiment & readability Not feasible Flesch-Kincaid + polarity Compare across competitors 4+ hours Single dashboard Generate recommendations Manual guesswork AI-driven, prioritized Total time per week 8+ hours 2-minute setup FAQ Frequently asked questions Everything you need to know before getting started. What is a newsletter analytics dashboard? A newsletter analytics dashboard gives marketers a single view of performance metrics, content scores, and competitive benchmarks across every newsletter they track. Newsletrix automatically scores subject lines, CTAs, readability, and sentiment for each send, and shows SWOT analysis, send-time heatmaps, and keyword trends side by side across all tracked competitors. How do I check a newsletter for quality and spam issues? Subscribe to any sender using your unique Newsletrix forwarding address. Newsletrix automatically checks every email that arrives - analyzing subject-line strength, content quality, readability, spam content signals, CTA placement, and link structure. Results appear in your dashboard within minutes of delivery. Does Newsletrix include an ESP checker? Yes. Newsletrix detects the email service provider ESP - such as Mailchimp, Klaviyo, SendGrid, or Beehiiv - for every newsletter analyzed. ESP detection runs automatically alongside content scoring and SWOT analysis with no extra steps required. Does Newsletrix run a newsletter spam test? Yes. Every newsletter analyzed by Newsletrix receives an automatic spam content score checking for spam-triggering language, excessive link density, and deliverability risk factors in the email body. This check runs on every send automatically. Do I need to install anything? No. You get a unique forwarding address - subscribe to any newsletter with it, and Newsletrix handles the rest. Zero integrations required. Which newsletter platforms do you support? Any platform that sends email - Substack, Beehiiv, Mailchimp, ConvertKit, Klaviyo, custom in-house tools. If it lands in an inbox, we analyze it. Is there a free plan? Yes. The free plan includes every feature, 2 analyses per week, and 1 tracking address - no credit card needed. Can I cancel anytime? Yes. All plans are month-to-month. Cancel from your dashboard with one click - no contracts, no calls. How fresh are the insights? Every newsletter is analyzed within minutes of arriving. Trends, recommendations, and SWOTs update automatically as new sends come in. Is my data private? Your tracked newsletters and insights are yours alone. We don't share your data with other customers, and you can export or delete it at any time. Get started Stop guessing. Start winning. Join newsletter creators using AI-powered competitor intelligence to ship better content, faster.