The story behind the name

The Great
Attractor

Ful.io tells you what any website is built with. We took the name from the Great Attractor — the unseen mass that pulls a hundred thousand galaxies toward a single point — because technology intelligence works the same way: no site hands you its stack, so we read the signals it leaves behind until the whole picture pulls into focus.

Meet the constellationWhy this name →
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How technology intelligence works

The web never says what it’s built with.

No website ships a manifest of its technology. So Ful.io reads what it leaves behind — response headers, script sources, DNS and mail records, cookies, meta tags, JS globals and a thousand subtler tells — tens of thousands of detection patterns firing across every page we touch.

One signal proves little. Thousands, together, resolve into a precise stack: the CMS, the framework, the analytics, the payment rail, the host. It is the same method that revealed the Great Attractor — no one ever saw it; astronomers measured how a hundred thousand galaxies drift, and all that motion pointed to one place.

150–250 Mly
distance, toward Norma
~600 km/s
our infall velocity
100,000+
galaxies in Laniakea
1978
first felt, never seen

Four attractors, one focal point

The pull is made of four forces.

Each part of Ful.io is an attractor with its own mass and reach — and together they turn raw web signal into technology intelligence you can query. Alone, each is just motion; combined, they point to one answer: what this domain is built with.

FA
J1615−6054
Frontend Attractor
the face — where the pull is felt
The interface every visitor touches: domain search, technology directories, live reports and dashboards. The surface that turns the mass below into an answer you can read.
stack · Next.js · React
BA
J1618−6112
Backend Attractor
the mass — the engine of the pull
The API and the data engine — over a billion domain × technology edges, keywords, verticals, companies and countries. The gravity behind every result the surface shows.
edges · 1B+ domain × tech
CA
J1611−5943
Crawler Attractor
the reach — sweeping the dark
A distributed scanning fleet reaching across the web, resolving what powers each site in real time and feeding fresh, verified signal back into the mass.
mode · on-demand + bulk sweep
TA
J1620−6027
Technologies Attractor
the map — every signal, charted
The intelligence layer: the catalog of technologies, the detection patterns, the verticals and stats that give every raw signal a name and a place on the map.
catalog · 75,000+ technologies

the_great_attractor

Combined, they reveal the whole stack.

FA · BA · CA · TA converge on a single gateway — the_great_attractor, the API that binds all four and serves what they were built to find: the complete technology profile of any website. The point in the dark that every signal leans toward.

ACO 3627 · Norma Cluster

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