Toolumen is a growing set of small, focused utilities for the web — SEO & AEO auditing, Open Graph previews, schema, accessibility and speed. Most run entirely in your browser — no upload, no telemetry. Plans from $19.99/mo.
A focused catalog, not a junk drawer. Every tool does one job well and gets out of your way.
Grade any URL in 5 seconds
Open tool SEO & AEOSee the link before you ship
Open tool PerformanceCore Web Vitals for any URL
Open tool Accessibilityaxe-core WCAG audit
Open tool SecurityGrade your HTTP headers
Open tool Content + SchemaValidate JSON-LD on any URL
Open toolSee the full catalog, sorted by category — plus everything on the roadmap.
View catalogBuilt the way we wish every web utility worked.
Most tools process everything client-side. Your files and URLs never get uploaded — there is no server to leak them.
No trackers, no analytics beacons, no account spam. Open a tool, do the thing, close the tab.
These are the utilities Stacklumen reaches for on every Webflow and Astro build — sharpened in real client work.
Browse the catalog by category — SEO, accessibility, Webflow, images and more.
A URL, two colors, an embed, a batch of HEIC files. No setup, no install.
A graded report, a live preview, a converted file — instantly, in the page.
Start on Basic and move up when you need higher limits, priority tools, or the API. Cancel anytime.
No install, no fuss. Create a Stacklumen account to save your reports and stay on the changelog.