BuiltWith Review
Technology intelligence — find what any website is built with and who else uses it
Quick Verdict
Sales and marketing teams prospecting on technology stacks, OSINT practitioners mapping target organization infrastructure, and competitive intelligence analysts tracking vendor adoption
Pros
- + Unmatched technology stack detection — the best in category
- + Lead generation feature turns competitor customer lists into prospect lists
- + Free tier is useful for individual lookups
- + Historical technology data tracks when stacks changed
- + Chrome extension for instant stack detection while browsing
Cons
- − Pro pricing is high ($295/month) for non-sales use cases
- − Most valuable features (lead gen, API) require higher tiers
- − Data accuracy varies — some detections are stale or incorrect
- − Overkill for basic OSINT lookups
What BuiltWith Does
BuiltWith crawls sites to find out their tech stacks, including CMS, analytics tools, CDNs, hosting providers, payment gateways, email marketing software. Every site has a profile.
Enter a domain, and BuiltWith provides the tech details. Want sites using a specific tool? BuiltWith lists them.
Core Use Cases
Technology Stack Research
The company supports a wide range of technologies, including: CMS options such as WordPress, Shopify, and Custom. Analytics tools like GA4, Mixpanel, Segment. Pixels from Google Ads, Meta, and ad networks. CDNs from Cloudflare, Fastly, Akamai. Hosting services from AWS, GCP, Azure, and smaller providers. Email platforms like Klaviyo, Mailchimp, ActiveCampaign. Support tools such as Intercom, Drift, Zendesk.
The free tier covers individual lookups. You plug in a URL and get the tech readout. You see what a site uses for analytics, hosting, and advertising. You might find their payment processor, CDN. Some details are obvious, others aren't. You won't guess the email platform or tag management. You need to look it up. BuiltWith saves you time. You get dozens of tech categories, CMS, analytics, pixels, CDNs, hosting, email, support tools.
Competitive Intelligence
BuiltWith stores historical data on tech stacks, changes over time, competitor by competitor.
You can track platform migrations, see when they switched.
Recent additions show up too, new tools, new services.
Dropped vendors leave a trail; when they quit a service, BuiltWith has a record. That's the data.
Operators miss some changes; tools get silently swapped. BuiltWith catches it.
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Lead Generation (Pro Feature)
BuiltWith's lead gen feature tops its paid offerings. Enter a tech stack, and get every company using it. Sales teams love it for prospecting.
You query technologies, and get companies that match. For example, you can search for Salesforce users in the Southwest with a revenue of $10M-50M. BuiltWith then provides a list that you can export.
The pro price tag is justified for sales teams. However, for OSINT investigators, it may not be as crucial.
OSINT and Due Diligence
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From an OSINT perspective, tech stack data reveals useful intel. Infrastructure dependencies. The providers an organization relies on. Business activity signals, like adding a payment processor or enterprise analytics. Shared infrastructure includes multiple domains on the same analytics ID or CDN config. Vendor relationships are also revealed, which provide a partial map of a company's vendors, relevant for third-party risk.
Pricing
| Plan | Price | Features |
|---|---|---|
| Free | $0 | Individual domain lookups, basic data |
| Basic | $295/mo | Full data, 2,000 lead credits/mo |
| Pro | $495/mo | Bulk data, API access, 5,000 lead credits/mo |
| Team | $995/mo | Multiple users, 20,000 lead credits/mo |
The free tier handles individual lookups, you can manually check any domain. The $295/month tier is for bulk tech research or large-scale lead generation, where the paid features are useful.
Chrome Extension
BuiltWith has a free Chrome extension called Profiler. It shows you the tech stack of any page you're on.
Profiler beats the web app for OSINT. You get instant data while browsing. No extra clicks are needed.
The extension is free; install it. Even if you don't pay for BuiltWith, it's worth it.
Compared to Alternatives
Wappalyzer and BuiltWith both offer tech detection, but with some differences. You might prefer Wappalyzer's browser extension, however, BuiltWith has better historical data.
Shodan and BuiltWith serve different purposes. Shodan scans infrastructure, making it a better choice for server analysis. BuiltWith scans web applications, providing insight into what's running on servers.
You can manually inspect a webpage by right-clicking and checking the headers, but BuiltWith automates this process on a much larger scale. It saves time by quickly detecting the technology used on a site, including JavaScript libraries, analytics tools, and server software.
Limitations
Pricing for bulk use: The free tier is limited, offering only a few manual lookups. For bulk research, API access, or lead generation, the cost is $295/month. This is steep for non-commercial OSINT use cases.
Data accuracy: BuiltWith's data can be stale. A site that recently migrated may still show old tech.
Detection scope: BuiltWith detects client-side tech, some server-side tech. Private server-side languages and internal tools are not detected. Anything without a frontend fingerprint won't show up.
Verdict
BuiltWith sets the bar for technology stack intel. The free Chrome extension is a must-have. The web app handles one-off lookups for free.
Commercial plans are ideal for sales teams with lead generation needs. The free tier and extension are sufficient for OSINT, covering basic stack checks.
See Also
Further Reading
Tool Relationships
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This review reflects testing as of 2026-03-31. OSINT tools change frequently — check the vendor's current documentation for pricing and feature updates. Report an error →