Head-to-head comparisons
Short, honest breakdowns of the most-searched 'X vs Y' matchups in the website-technology detector space.
How to read these comparisons
Every tool here answers the same surface question — what is this site built with? — but they diverge sharply on how: surface fingerprints versus sourcemap-deep reads, whole-internet crawl databases versus per-page inspection, free-and-local versus paid API. Those differences are exactly what decides which one is right for a given job.
So each matchup below stays on the axes that actually differ — detection depth, version accuracy, privacy, coverage and price — and states our bias up front: Sourcemap Explorer is per-page and sourcemap-aware, so it wins on depth and exact versions for the page in front of you, and is the wrong tool for bulk lead lists or historical market-share data. Where a rival is the better pick, the comparison says so.
Wappalyzer vs BuiltWith
Wappalyzer and BuiltWith are the two most-referenced website-technology detectors, but they solve slightly different problems. Wappalyzer leads on breadth of fingerprints and per-page detection. BuiltWith leads on technographic data for sales and marketing teams. They overlap on the surface — both will tell you a site is built with Next.js and uses Google Analytics — but diverge sharply once you push on depth, workflow or price.
Wappalyzer vs WhatRuns
Wappalyzer and WhatRuns are both Chrome extensions that tell you what technology a site uses. They overlap heavily, but WhatRuns is lighter and more consumer-oriented while Wappalyzer has the larger fingerprint database, the more-developer-ish UI and the better per-page depth. The real architectural difference — and the one most people don't notice until it matters — is that WhatRuns is backend-driven: each popup invocation sends the URL to WhatRuns servers for lookup. Wappalyzer's extension does its detection locally.
FAQ
Which website-technology detector is the most accurate?
It depends on what you're measuring. Bulk databases like BuiltWith win on historical and company-level coverage; surface fingerprinters like Wappalyzer and WhatRuns are fast and broad. For depth on a single live page — the exact library and version a site actually ships — a sourcemap-aware tool reads it straight from the bundle rather than inferring it, which is where Sourcemap Explorer is strongest.
Do I need to pay for any of these tools?
Most offer a limited free tier and charge for bulk lookups, history or API access. Sourcemap Explorer is fully free and runs locally in your browser, with no account and no per-lookup cap, because it reads the page you're already on rather than querying a backend.
Why compare detectors at all if they all read the same site?
Because they read it differently. The meaningful axes are detection depth (surface signals vs sourcemap-level), version accuracy, privacy (local vs cloud), coverage (per-page vs whole-internet database) and price. Each comparison below isolates those axes for one matchup so you can pick by the trade-off that matters to you.