Everything you need to get
the most out of Toolumen.

Toolumen is a growing catalog of small, single-purpose web tools — SEO and AEO auditing, Open Graph previewing, schema and accessibility tooling, security checks, Webflow embed sizing, and more on the way. It’s a Stacklumen product, built from the utilities we reach for on every Webflow and Astro engagement.

Most tools run entirely in your browser. There is nothing to install — open a tool, paste a URL, and you get the answer in the page.

Some tools need a Stacklumen account. The tools under /tools/* are gated, so you’ll be asked to sign in the first time you open one. That lets us email you reports and keep you on the changelog. An active plan unlocks the heavier tools.

Light and dark are both first-class. Every page follows your system or site theme automatically, with palettes tuned for each.

Plans, runs & reports

Every tool sits behind a signed-in account with an active plan. There are two: Starter ($4.99/month) includes 10 runs per calendar month across every tool, and Premium ($19.99/month) is unlimited.

A run is a single result from a metered tool — one audit, one preview, one validation, one speed test. The counter resets on the 1st of each month and doesn’t roll over. When a Starter account reaches 10 runs, the tool shows an upgrade prompt; Premium never meters. There’s no per-call cost for the tools that use Google PageSpeed Insights — that API is free.

Reports. The audit tools (SEO, Speed, Accessibility, Security Headers, Schema) produce two takeaways you can keep: a Download PDF — a branded, vector document with selectable text, not a screenshot — and Copy summary, which puts a plain-text version on your clipboard for a ticket, PR, or email.

Tutorials: using each tool

Step-by-step for every tool in the catalog. Each links to the live tool at the top.

SEO + AEO Audit Open tool →

What it does. Fetches a URL server-side and grades ~24 signals across classic SEO and AEO (answer-engine optimization): title and meta length, canonical correctness, the X-Robots-Tag header and robots meta, Open Graph and Twitter cards, JSON-LD presence and validity, heading hierarchy, image alt coverage, whether your content is in the raw HTML (so ChatGPT/Perplexity/Claude can read it), whether AI crawlers are allowed in robots.txt, plus sitemap.xml and llms.txt.

How to use it:

1. Open the tool and paste a full URL (e.g. https://example.com/pricing). No protocol? We add https:// for you.
2. Press Run audit. Results appear in a few seconds.
3. Read the score gauge (0–100) and the grade, then work top-down through Priority fixes — the failing/warning checks ranked by impact.
4. Expand the Full breakdown to see every signal grouped by category with a per-category sub-score, and a concrete Fix and Why it matters for each.
5. Click Download PDF for a client-ready report, or Copy summary for a plain-text checklist.

Reading the results. Green = pass, amber = warning, red = fail. AEO signals (content-in-HTML, AI-crawler access, JSON-LD validity, E-E-A-T author/dates) are the ones most people miss — fix those to get cited by AI answer engines, not just ranked.

Open Graph Preview Open tool →

What it does. Fetches a URL and renders exactly how its link unfurls across Slack, iMessage, X/Twitter, LinkedIn, Discord, Facebook, and Google — from the page’s og: and twitter: meta tags.

How to use it:

1. Paste the URL you’re about to share and press Preview.
2. Scan each platform card — they render at each service’s real dimensions and truncation rules.
3. Check the raw tag list below for a missing og:image, an image that isn’t 1200×630, or a title/description that gets clipped.

Tip. Fix issues here before you post — social platforms cache OG data aggressively, so a bad first share can stick around for days.

JSON-LD Generator Open tool →

What it does. Builds valid schema.org JSON-LD structured data from a form — no memorizing the spec. Runs entirely in your browser.

How to use it:

1. Pick a schema type (Organization, Article, Product, FAQ, Breadcrumb, and more).
2. Fill in the fields; the JSON-LD updates live as you type.
3. Copy the generated <script type="application/ld+json"> block and paste it into your page’s <head> (or a Webflow embed).
4. Confirm it with the Schema Validator once it’s live.

Schema Validator Open tool →

What it does. Fetches a live URL, extracts every JSON-LD block, and validates it — flagging parse errors, unknown types, and missing recommended properties so your rich results actually qualify.

How to use it:

1. Paste a URL and press Validate.
2. Review each detected schema type and its status.
3. Fix any errors (broken JSON, missing required fields) at the source, then re-run.

Speed Test Open tool →

What it does. Runs Google PageSpeed Insights (a full Lighthouse audit + the Chrome UX Report) and grades Core Web Vitals — LCP, INP, CLS, FCP, TBT, Speed Index — with real-user field data when the page has enough traffic.

How to use it:

1. Paste a URL and choose Mobile or Desktop (Google ranks mobile-first, so start there).
2. Press Run speed test. A full run takes 10–40 seconds — the loading panel shows live progress; don’t refresh.
3. Read the performance score and the lab-metric cards (red/amber/green per metric).
4. Work the Opportunities — each lists the exact offending files with wasted KB/ms, which Core Web Vital it hurts, and how to fix it.
5. Check Diagnostics for the deeper causes (your LCP element, render-blocking resources, TTFB, unoptimized images, third-party scripts, DOM size).

Reading the results. Lab metrics are a controlled test (reproducible, single run); field data is real visitors over 28 days (the truth, when available). Very large sites can occasionally time out — test a single page instead of the whole domain.

Accessibility Audit Open tool →

What it does. Runs Lighthouse’s axe-core-powered accessibility checks against a URL and grades them against WCAG — contrast, labels, ARIA, alt text, heading order, and more — without you installing a headless browser.

How to use it:

1. Paste a URL and press Run audit (10–40 seconds, same loading panel as the Speed Test).
2. Read the score, then go through failing checks first — each names the WCAG rule and how many elements fail.
3. Fix in your source, re-run to confirm, and Download PDF for the record.

Note. Automated tools catch roughly a third to a half of accessibility issues — pair this with manual keyboard and screen-reader testing for anything you’re certifying.

Contrast Checker Open tool →

What it does. Computes the exact contrast ratio between a foreground and background color, its WCAG AA and AAA pass/fail for normal and large text, and a one-click brand-safe suggestion when a pair falls short. Fully client-side.

How to use it:

1. Enter a foreground and a background color (hex, or use the pickers).
2. Read the ratio and the AA/AAA badges for normal vs large text.
3. If it fails, apply the suggested nearest-passing shade, or nudge the colors until it clears the threshold you need (4.5:1 for AA body text).

Security Headers Open tool →

What it does. Fetches a URL and grades its HTTP response security headers — HSTS, Content-Security-Policy, X-Frame-Options, X-Content-Type-Options, Referrer-Policy, Permissions-Policy — with the exact header value to add for each gap.

How to use it:

1. Paste a URL and press Scan.
2. Read the letter grade, then address missing/weak headers top-down.
3. Copy the suggested header value for each gap into your server, CDN, or host config, then re-scan.

Webflow Embed Sizer Open tool →

What it does. Minifies pasted HTML/CSS/JS and reports the real character count, raw KB, and gzipped size — then tells you whether it fits inside Webflow’s ~10,000-character embed cap. Runs entirely in your browser.

How to use it:

1. Paste your embed markup.
2. Read the minified character count against the cap — green means it fits, red means trim it.
3. Copy the minified output straight into a Webflow Embed element.