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:
- Bloomberry - best for detecting enterprise tech + lead generation
- Hunter TechLookup - best for prospect listing building
- TechPeeker - Most similar to BuiltWith
- Tagstack - best for analyzing GTM containers (Google Tag Manager)
- Wappalyzer - best for real-time browser-based detection
- SimilarTech - best for market-level analysis
- WhatRuns - best free alternative
- urlscan.io - best for security research
1. Bloomberry — Enterprise Tech Detection
Best for: Sales teams targeting enterprise buyers needing backend and SaaS visibility.
Bloomberry distinguishes itself through non-website data sources, detecting technologies like Microsoft Teams, Zoom, and Salesforce that never appear in frontend code. Backed by Revealera's five-year hedge fund intelligence history, the platform reveals adoption dates and churn indicators.
Strengths:
- Sophisticated churn detection
- Comprehensive newer technology coverage
Limitations:
- JavaScript frameworks underperform
- Large-scale frontend lists aren't ideal
Pricing: Free tier available; paid plans from $199/month
2. Hunter TechLookup — Free Prospect Lists
Best for: SDRs and marketers building outbound campaigns with limited budgets.
Hunter.io's TechLookup extension integrates email discovery with technology filtering across 4.5 million domains. The first 5,000 rows export completely free.
Strengths:
- Minimal interface
- Email integration
- Quality-focused dataset
Limitations:
- No browser extension
- List-building only (not individual analysis)
Pricing: Free for 5,000 rows; paid Hunter plans unlock 50,000 rows
3. TechPeeker — BuiltWith Alternative
Best for: Marketers and agencies seeking BuiltWith-style detection without enterprise pricing.
TechPeeker provides domain analysis with CMS, frameworks, ecommerce platforms, and hosting breakdowns. Strong Shopify theme and WordPress plugin detection capabilities.
Strengths:
- BuiltWith-familiar workflow
- Theme/plugin specificity
- Chrome extension
Limitations:
- Public-facing data only
- Smaller tech database
- No internal SaaS detection
Pricing: Plans around $250/month; some tools free
4. Tagstack — GTM-Focused Analysis
Best for: Analytics agencies and MarTech consultants auditing implementations.
Tagstack specializes in Google Tag Manager analysis, scoring container health and identifying tracking gaps. Searches 1.4 million+ scanned containers.
Strengths:
- Granular GTM audits
- Consent mode analysis
- JSON export capability
Limitations:
- GTM-specific only
- Minimal CMS or general tech coverage
Pricing: Free tier; unlimited audits in paid plans
5. Wappalyzer — Real-Time Detection
Best for: Sales reps needing instant tech visibility during prospect research.
The 2009-founded extension detects technologies in real-time across 115+ tech categories, with 4.6/5 Chrome rating and 9.9/10 G2 ease-of-use score.
Strengths:
- Real-time updates
- Crowdsourced accuracy
- Clean interface
Limitations:
- Backend technology gaps
- Niche tech misses
- Limited to mainstream platforms
Pricing: Free (50 lookups/month); Pro from $250/month
6. SimilarTech — Market Analysis
Best for: Enterprise sales teams needing combined firmographic and technographic filtering.
SimilarTech bundles technology detection with traffic data, company size, industry, and geography. Historical adoption data spans back to 2007.
Strengths:
- Advanced multi-factor filtering
- Trend analysis capability
Limitations:
- Backend gaps
- Extension performance issues
- Enterprise pricing
Pricing: Starter $249/month; Professional $499/month; Enterprise custom
7. WhatRuns — Free Alternative
Best for: Freelancers, solo operators, and casual researchers.
A completely free browser extension providing basic technology detection without account requirements. Users can track competitor tech changes.
Strengths:
- Zero cost
- Instant setup
- Competitor monitoring
Limitations:
- Thinner coverage
- No list building
- Individual lookup only
Pricing: 100% free
8. urlscan.io — Security Research
Best for: Security researchers and OSINT investigators.
This platform analyzes submitted URLs comprehensively, logging scripts and third-party services across internal pages typically missed by crawlers.
Strengths:
- Deep technical analysis
- Internal page visibility
- Network request logging
Limitations:
- Steep learning curve
- No sales-focused features
Pricing: Free
Decision Framework
Choose based on specific workflow requirements:
- Enterprise backend detection: Bloomberry
- Free prospect lists: Hunter TechLookup
- BuiltWith equivalent: TechPeeker
- GTM specialization: Tagstack
- Browser convenience: Wappalyzer
- Market trends: SimilarTech
- Zero budget: WhatRuns
- Security focus: urlscan.io
BuiltWith remains strong for massive frontend technology lists, yet specialized alternatives now dominate specific use cases. Evaluate tools against your actual workflow requirements rather than defaulting to market incumbents.