7 BuiltWith Alternatives for Tech Lookups in 2025
BuiltWith has been the go-to tool for tech stack detection since 2007. It tracks over 85,000 technologies across 673 million websites. But it's not perfect.
Pricing starts at $295/month. The data skews heavily toward frontend technologies. Backend tools like Slack, Okta, or internal CRMs rarely show up. And the crawl-based approach means data can lag behind real-time changes.
I tested seven alternatives with actual accounts. Here's what I found.
1. Bloomberry - Best for Enterprise Tech Detection
Best for: Sales teams selling to enterprise buyers. Investors tracking technology adoption trends. Anyone who needs visibility into backend and SaaS tools, not just what's on a website.
Bloomberry takes a fundamentally different approach. Instead of just crawling websites, it detects technologies that never appear in frontend code. Think Microsoft Teams, Zoom, Salesforce, and thousands of other backend products.
The data comes from their parent company, Revealera. They've supplied technographic and job posting data to hedge funds for over five years. Three of the world's 20 largest funds use their intelligence. That pedigree shows in the data quality.
Search for "Okta" and you'll see 10,000+ verified company profiles. Each one includes adoption dates and churn signals. BuiltWith simply can't provide this because it only sees what's embedded in public-facing web pages.
What stood out in testing:
The churn detection is surprisingly sophisticated. Bloomberry flagged fieldlogix.io as having churned from Intercom, even though the Intercom script was still on their site. The widget had stopped working. That's the kind of nuance that matters for competitive sales intelligence.
They also cover newer technologies that BuiltWith misses entirely. LemList, a sales engagement platform, showed over 1500 detected companies on Bloomberry. BuiltWith had zero.
Limitations:
JavaScript frameworks aren't a strength here. If you need a list of 53 million React sites, BuiltWith is still better. Same goes for massive lists of WordPress or Shopify stores.
Pricing: Free tier with sample data. Paid plans from $199/month. Available via web UI and API.
2. Hunter TechLookup - Free Prospect List Building
Best for: SDRs and marketers building outbound lists. Small teams with limited budgets. Anyone who wants technology data integrated with email outreach.
Hunter TechLookup comes from Hunter.io, the email finder tool with 6 million+ users. The core Hunter platform holds a 4.4/5 rating on G2 with 600+ reviews. TechLookup extends that infrastructure to technology detection.
The value proposition is simple. Search for any technology. Filter by industry, language, or popularity. Export a list of websites using it. The first 5,000 rows are completely free.
What stood out in testing:
The integration with Hunter's email finder works well. You're not just getting a list of domains. You're getting a pipeline-ready dataset with company names, categories, social profiles, and (if you're on a paid Hunter plan) direct email contacts.
The UI is minimal but effective. No clutter. No overwhelming feature bloat. Pick a technology, apply your filters, download your list. The whole process takes under two minutes.
Hunter tracks 115+ technologies across 4.5 million domains. That's smaller than BuiltWith's database, but the quality-to-noise ratio feels higher for B2B prospecting use cases.
Limitations:
There's no browser extension for real-time lookups. This is a list-building tool, not a "what tech does this site use?" tool. For individual site analysis, you'll need to pair it with something like Wappalyzer.
Pricing: Free for 5,000 rows per technology. Paid Hunter plans unlock up to 50,000 rows and add email integration.
3. Tagstack - GTM-Focused Analysis and Lead Gen
Best for: Analytics agencies and consultants. Marketing ops teams auditing implementations. Anyone who sells GTM optimization, consent management, or server-side tracking services.
Tagstack specializes in Google Tag Manager analysis. This isn't a general-purpose tech profiler. It's a deep-dive tool for the martech stack specifically.
Enter any URL or GTM container ID. Within seconds, you get a health score, a list of all tracked vendors, consent mode status, and specific recommendations for improvement. The level of detail goes far beyond what BuiltWith or Wappalyzer can provide for this use case.
What stood out in testing:
The container audit is genuinely useful. Tagstack categorizes issues by impact level: high, medium, and passed checks. It flags things like paused tags affecting site speed, missing conversion linkers, or consent mode gaps.
For lead generation, the Technology Lookup feature lets you search their database of 1.4 million+ scanned containers. Want to find companies using GA360? Sites without server-side tracking? Domains with specific consent management platforms? You can filter and export.
The ability to export GTM configurations as JSON is a nice bonus. If you're an agency building similar implementations across clients, this saves real time.
Limitations:
If you need CMS detection, ecommerce platform identification, or general tech stack visibility, this isn't the right tool. Tagstack does one thing well: GTM and martech analysis. Everything else is out of scope.
Pricing: Free tier with limited scans. Paid plans for unlimited audits and advanced features. API available.
4. Wappalyzer - Real-Time Browser Extension
Best for: Sales reps who need instant tech stack visibility during prospecting. Developers curious about how sites are built. Anyone who wants detection without leaving their browser.
Wappalyzer has been around since 2009. The Chrome extension alone has a 4.6/5 rating with thousands of reviews. On G2, reviewers give it a 9.9/10 for ease of use and 9.5/10 for quality of support.
The approach is different from BuiltWith's scheduled crawls. Wappalyzer detects technologies in real-time as you browse. Because detection is crowdsourced from users running the extension, changes often show up faster than they would in a crawl-based database.
What stood out in testing:
Install the extension. Visit any site. Click the icon. You immediately see CMS, analytics, CDNs, marketing tools, and more, organized by category. No account needed for basic use.
The accuracy is solid for mainstream technologies. WordPress, Shopify, HubSpot, Google Analytics, Stripe. All detected reliably in my testing. The interface is clean and fast.
For list building, Wappalyzer offers a web platform where you can search for sites using specific technologies and export leads with company and contact data.
Limitations:
Backend technologies don't show up reliably. Even when Wappalyzer reports something like Okta, it's often inferring from frontend scripts, which may appear late in a customer's lifecycle or not at all.
Newer or niche technologies are hit-or-miss. In testing, Wappalyzer missed Pipecast entirely.
Pricing: Free plan with 50 lookups/month and unlimited extension use. Pro plans start at $250/month for larger lead lists and API access.
5. SimilarTech - Advanced Filtering and Market Analysis
Best for: Enterprise sales teams that need firmographic + technographic filtering in one place. Market researchers tracking technology adoption trends. Teams already using SimilarWeb for traffic data.
SimilarTech comes from the SimilarWeb family. Where BuiltWith focuses primarily on technology detection, SimilarTech layers in traffic data, company size, industry, and geographic filtering.
The pitch is compelling: instead of exporting a BuiltWith list and enriching it in Clay or another tool, you can do the filtering natively in SimilarTech's interface.
What stood out in testing:
The filter combinations are powerful. You can find sites using Shopify + Google Analytics + specific ad platforms, then narrow by country, language, industry vertical, and estimated traffic. That level of granularity saves time versus building the same logic in a spreadsheet.
Historical data goes back to 2007. For trend analysis (tracking how specific technologies gained or lost market share) this is genuinely useful.
The free browser extension works similarly to Wappalyzer for quick lookups.
Limitations:
Backend technologies aren't covered. Like most crawl-based tools, SimilarTech only sees what's exposed on websites.
The G2 profile hasn't been actively managed in over a year. User reviews mention occasional data gaps and slow loading in the extension. Enterprise pricing puts it out of reach for smaller teams.
Pricing: Starter plans from $249/month. Professional from $499/month. Enterprise pricing requires a call.
6. WhatRuns - Completely Free
Best for: Freelancers and solo operators with zero budget. Quick curiosity checks when you don't need full data. Students learning about web technologies.
WhatRuns is a free browser extension. No account. No credit card. Just install and click.
The value is simple: free access to basic technology detection. For casual use cases, that's enough.
What stood out in testing:
Installation takes 30 seconds. The interface is clean. Results appear instantly. You can "follow" websites to get notified when their tech stack changes. Nice touch for tracking competitors.
Limitations:
Coverage is noticeably thinner than paid alternatives. In testing, WhatRuns missed Optimizely and Drift on sites where those technologies were clearly present.
There's no list building, no API, no advanced filtering. This is purely for individual site lookups.
Pricing: 100% free.
7. urlscan.io - Security and OSINT Research
Best for: Security researchers and pentesters. OSINT investigators. Anyone who needs to see technologies on internal pages that standard crawlers miss.
urlscan.io isn't a sales tool. It's a security analysis platform that happens to provide excellent technology visibility.
When someone submits a URL, urlscan visits the page, takes a screenshot, and logs every script, third-party service, and network request. The database includes inner pages (checkout flows, login screens, app pages) that BuiltWith typically doesn't crawl.
What stood out in testing:
The depth of analysis is impressive. You can see exactly which scripts loaded, what domains they connected to, and where technologies appear in the page structure.
Because urlscan indexes pages that users submit (including authenticated pages in some cases), you'll find technologies that only appear deep in a site's flow. Not just on the homepage.
Limitations:
The interface is built for technical users. If you're in sales or marketing, the learning curve is steep. There's no easy "show me all sites using X" list-building functionality.
Pricing: Free.
Which Tool Should You Choose?
The right choice depends entirely on your use case.
Choose Bloomberry if:
You sell to enterprise buyers
You need backend/SaaS technology detection
Churn signals and adoption timing matter to your sales motion
You're tired of BuiltWith missing the technologies you actually care about
Choose Hunter TechLookup if:
You need free prospect lists with technology filtering
You already use Hunter for email finding
Your budget is limited but you still need quality data
List building matters more than real-time individual lookups
Choose Tagstack if:
You work in analytics, martech, or consent management
You audit GTM implementations for clients
You sell services to companies with tracking problems
Deep GTM analysis matters more than broad tech coverage
Choose Wappalyzer if:
You want instant detection while browsing
Ease of use matters more than data depth
You're building lists of sites using mainstream technologies
You value strong customer support (9.5/10 on G2)
Choose SimilarTech if:
You need technology + firmographic filtering in one tool
Market share trends and historical data matter
You're already in the SimilarWeb ecosystem
Enterprise pricing isn't a blocker
Choose WhatRuns if:
Your budget is literally zero
You just need quick, casual lookups
Full data coverage isn't critical
Choose urlscan.io if:
You're doing security research or OSINT
You need to see technologies on inner pages
You're comfortable with a technical interface
The Bottom Line
BuiltWith built this category. It's still a solid choice for massive frontend technology lists and historical market share data.
But the landscape has evolved. If you need backend technologies, Bloomberry wins. If you want free list building, Hunter TechLookup delivers. If GTM analysis is your focus, Tagstack goes deeper than anything else.
Pick the tool that matches your actual workflow. The "best" alternative is the one that solves your specific problem.
