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Headline Studio — Scoring Engine + 60 Formulas
Paste a headline, get a 0–100 score across 5 research-backed dimensions plus concrete rewrites. Pure JS — no AI calls, no account.
What it does & who it's for
Headline Studio is a working headline scorer, not a worksheet. Paste any headline and a deterministic engine grades it 0–100 across five dimensions — word balance (checked against 550+ embedded power, emotional, common and buzzword lexicons), length & scannability, specificity, clarity, and curiosity gap. You get an animated score dial with a grade and verdict, per-dimension bars with plain-English diagnostics, a word-by-word colour analysis, a list of what's already working, and prioritised fixes — many with concrete rewrites you can load back into the scorer with one click. It's a single self-contained HTML file: double-click it and it runs, offline, from your disk, with no account and no install. Be clear about what this is: a research-backed heuristic engine, not an AI. The rules are distilled from widely-published headline research — Conductor's numbered-headline reader survey, the Outbrain/HubSpot bracketed-clarifier study, search-snippet truncation behaviour — and every weight, threshold and word list is documented in scoring-methodology.md, which is generated from the engine source so it can't drift from the code. That design has real advantages: scoring is instant, free to run forever, fully reproducible (same headline, same score, every time), and 100% private — nothing you type leaves your browser. There's even a clickbait guard: known-spam phrasings like "you won't believe" cap the score instead of inflating it. The pack goes beyond the tool. embed-widget.js is a drop-in scorer for your own site — add one script tag and a div and it auto-mounts, with light/dark themes, an onScore callback, and a headless HeadlineStudio.score() API for programmatic use. 60-headline-formulas.md is a genuine pattern library — sixty fill-in formulas organised by job (how-to, listicles, curiosity, questions, data & proof, mistakes, comparisons, speed & ease, authority, contrarian), each with a worked example and a when-to-use note. And if you want AI in the loop, llm-rewrite-prompts.md ships six engineered prompts for pairing the scorer with your own ChatGPT or Claude: the LLM generates variants, the deterministic scorer referees them. The live demo is the full engine — identical lexicons, weights and suggestions to the download, not a mock. Score your real headlines in it right now; if the feedback is useful, the paid pack adds the embeddable widget, the complete methodology, the formula library, the AI prompts and the customisation guide. Built for newsletter writers, bloggers, content and SEO marketers, and indie hackers who write their own copy.
What's included
- headline-studio.html — the complete scoring tool in one self-contained file: engine, UI, lexicons; runs offline from a double-click - embed-widget.js — drop-in embeddable scorer for your own site: auto-mount via data-attribute, light/dark themes, onScore callback, headless score() API, full instructions in the file header - scoring-methodology.md — every weight, threshold, formula and word list the engine uses, generated from the engine source so it exactly matches the code - 60-headline-formulas.md — 60 fill-in headline patterns in 10 categories, each with a template, worked example and when-to-use note - llm-rewrite-prompts.md — 6 engineered prompts for pairing the scorer with your own ChatGPT/Claude (targeted rewrite, A/B/C angles, brand voice, bulk triage, platform pass, devil's-advocate check) - README-setup.md — 30-second setup, embed guide, recommended writing workflow, customisation guide, FAQ
What's not included
- An AI model or subscription — the tool itself is deterministic and needs none; the optional LLM prompts file requires your own ChatGPT, Claude or similar - Any guarantee of click-through rates — scores are a disciplined craft checklist distilled from published research, not a CTR prediction - Hosting — the files run locally or on any static host/CMS you already have - Custom feature development or done-for-you headline writing
Requirements
Any evergreen browser from roughly 2020 onward (Chrome, Edge, Firefox, Safari) on desktop or mobile — the tool runs from a local file with no install, no account and no internet connection. For the embed widget: the ability to add one JS file and one div to your site (any static host, CMS or framework). Optional: your own AI chat subscription for the LLM rewrite prompts, and any text editor if you want to customise lexicons or weights.
Setup instructions
1. Unzip the pack and open README-setup.md. 2. Double-click headline-studio.html — it opens in your browser and runs entirely offline. 3. Type or paste a headline. The score, dimension bars, word-by-word analysis and suggested fixes update as you type; press Try it on any rewrite to rescore it, or Copy to take it. 4. To embed the scorer on your own site: copy embed-widget.js to your site, then add <div data-headline-studio></div> plus a script tag pointing at the file — it auto-mounts. Options (light theme, prefill, callback API) are documented in the file's header comment and README-setup.md. 5. To customise: open headline-studio.html or embed-widget.js in a text editor and edit the clearly-marked LEXICONS and WEIGHTS block at the top; scoring-methodology.md documents exactly what each change does. 6. Optional AI pairing: use the prompts in llm-rewrite-prompts.md with your own ChatGPT or Claude, and let the scorer referee the variants.
Version history
- v1.0Latest6 Aug 2026
Licence & terms
Licence terms
Single-project commercial licence. You may use, modify and deploy the tool, embed widget and documents for one business or client project, including on that project's public website and for that project's team. You may not resell, redistribute, sublicense or repackage the files (modified or not) as a template, tool, prompt pack or part of another marketplace listing. Purchase one licence per additional project.
Refund policy
14-day refund policy: if the product is materially not as described — a listed file is missing, or the tool does not score headlines as shown — contact us within 14 days of purchase for a full refund. Please try the demo before buying: it runs the complete scoring engine with the same lexicons and weights as the download, so you can judge the exact feedback quality you'd be paying for. Refunds are not provided for disagreement with individual scores, or for lack of the optional AI subscription noted under requirements. Refunds are not offered for change of mind. An approved refund ends your licence to the product — you must delete all copies of the files and stop using them.
Support terms
Email support covers opening and using the tool, embedding the widget (including the documented data-attribute and JS API options), and the customisation points documented in README-setup.md and scoring-methodology.md. It does not cover custom feature development, debugging your wider website, or headline-writing services. Typical response within 2 business days.
These terms are snapshotted at purchase — what you see here is what applies to your order.
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