A free, local-first alternative to Netcraft
Security-and-research oriented site-technology lookup with a long heritage — strong on hosting, SSL and server-side history, thin on frontend stack.
Founded 1995 · Pricing: Free 'Site Report' web lookups; paid tiers for security monitoring products (phishing takedown, brand protection).
Overview
Netcraft predates all of the alternatives on this page by more than a decade. Founded in 1995, it started as a web-server-survey service — the quarterly 'who hosts what, which HTTP server, which SSL certificate' report that the early web relied on for infrastructure research. Over the years it expanded into phishing detection, brand protection, cybercrime takedown and adjacent security services, but the free 'Site Report' page — where you paste a domain and get a hosting-and-history dashboard — remains what most casual users know Netcraft for. It's reputable, it's thorough on hosting and SSL history, and it's almost unrelated to the question 'what JavaScript framework does this site use'.
History
Netcraft's web-server survey has been running since 1995 and is one of the longest-continuously-published datasets about the web. Its historical snapshots of HTTP server popularity (Apache overtaking NCSA; nginx overtaking Apache; Cloudflare as an interesting confounder) are a recurring citation in infrastructure journalism. The shift into security products happened in the 2000s and has been the main revenue driver since.
Who uses it and for what
Security teams use Netcraft's paid products for phishing takedown workflows and brand-protection monitoring. Researchers and journalists use the free Site Report for hosting-history lookups. Infrastructure-curious developers occasionally hit the Site Report when investigating who hosts a given domain.
Pricing in detail
What Netcraft does well
Long hosting and SSL history
Netcraft's historical view of a domain's hosting, IP ranges, SSL certificate chain and server software is unmatched. Useful for security research and attribution.
Reputable brand, long heritage
Thirty years of continuous operation in the web-infrastructure space. Trusted source for infrastructure-centric research.
Security products
The paid phishing-takedown and brand-protection offerings have a real customer base and are not the target of this comparison.
Where Netcraft falls short
These are the gaps a developer-first, sourcemap-aware workflow cares about.
Frontend stack detail is thin
The Site Report is hosting/SSL/server-stack centric. JavaScript frameworks, libraries, CMS plugins, bundlers — none of that is Netcraft's focus. You'll see 'Technology: JavaScript, HTML5, CSS3' as an answer, which is not wrong but not useful.
No sourcemap awareness
Not the tool's focus, so obviously not implemented.
No browser extension
Web-based lookup only. You paste a domain into a form. No per-tab experience.
Security-product pricing for anything beyond the free Site Report
If you want more than the free dashboard, you're in enterprise-sales territory, which is appropriate for Netcraft's customer base but useless for a developer.
Where Sourcemap Explorer wins
Not across the board — we don't run bulk API queries and we don't publish market-share dashboards. These are the things we do that Netcraftdoesn't.
Frontend-deep
Netcraft tells you the hosting and server. Sourcemap Explorer tells you the framework, the libraries, the WordPress plugins and the exact versions — the frontend stack, which is a different question.
Works live, in context
Instead of pasting a domain into a form, you just browse and the extension does its job passively.
A concrete workflow example
You're investigating an e-commerce fraud case. Netcraft's Site Report tells you the suspect domain is behind Cloudflare in front of an AWS US-East origin, with a Let's Encrypt certificate issued three weeks ago — genuinely useful attribution data. Sourcemap Explorer tells you the storefront is a custom Next.js app bundling Stripe Elements and running the default Magento admin in a subdirectory — a different axis of evidence. Both matter for a full picture.
Which one should you use?
Migration notes
Not a migration — orthogonal products. Infrastructure teams will keep Netcraft; developer teams will add Sourcemap Explorer.
FAQ
Is Netcraft still relevant to developers?
For infrastructure-level investigation, yes. For 'what framework does this site use?', no — that's not the product's lane.
Other alternatives to compare
Try Sourcemap Explorer on the next site you study.
Install the extension, browse normally. When a site exposes sourcemaps, the toolbar icon turns green — click it and you'll see the full project tree plus the detected stack, with exact versions.