If you need to detect what technologies a website uses, you've probably come across BuiltWith and Wappalyzer. They've been around for years and dominate the space. But they were built for a different era — one where $300+/month for API access was the only option.
I built DetectZeStack as a developer-first alternative. In this post, I'll compare all three honestly — including where each tool excels and falls short.
Quick Comparison
| Feature | BuiltWith | Wappalyzer | DetectZeStack |
|---|---|---|---|
| Starting price | $295/mo | $250/mo | Free (100 req/mo) |
| API access | $995/mo | $450/mo | $5/mo (5K requests) |
| Technology signatures | ~111,000 | ~8,000 | 3,500+ |
| Real-time analysis | Cached/crawled | Yes | Yes |
| Detection method | Web crawling | HTTP + HTML | HTTP + HTML + DNS + TLS |
| DNS/TLS detection | No | No | Yes |
| CPE identifiers | No | No | Yes |
| Stack comparison | No | No | Yes |
| Webhook alerts | No | No | Yes |
| Free tier | No | Browser extension only | 100 req/mo |
BuiltWith: The Enterprise Standard
BuiltWith has been around since 2007 and has the largest technology database — over 111,000 signatures. It's the go-to for enterprise sales teams and market researchers.
Strengths:
- Massive database: 111K+ technologies, including obscure plugins and analytics tools
- Historical data going back years
- Built-in lead list generation filtered by technology
- Market share reports across millions of sites
Weaknesses:
- Starts at $295/month, API requires Pro at $995/month
- Stale data — crawls periodically, not on demand
- No real-time analysis — only reports what it found during its last crawl
- Complex pricing tiers
Best for: Enterprise sales teams with budget for historical data and lead lists.
Wappalyzer: The Developer Favorite
Wappalyzer started as an open-source browser extension in 2009. It was acquired by Sindup in August 2023, and the open-source repository was archived.
Strengths:
- Well-known brand with strong community
- ~8,000 well-maintained technology signatures
- Free browser extension for one-off lookups
- CRM integrations (HubSpot, Salesforce, Pipedrive)
Weaknesses:
- API starts at $250/month (Starter), $450/month (Business)
- No longer open source — fingerprints are closed
- Frontend-only detection (HTTP + HTML) — misses infrastructure
- No CPE data for security use cases
- Restrictive rate limits on paid plans
Best for: Teams that need CRM integrations and are in the Wappalyzer ecosystem.
DetectZeStack: The Developer-First API
DetectZeStack was built from the ground up as a REST API. No dashboards, no CRM plugins — just a fast, well-documented API that returns structured JSON.
Strengths:
- Free tier (100 req/mo), paid starts at $5/mo for 5K requests
- Multi-layer detection: Wappalyzer fingerprinting + DNS CNAME + TLS certificates + custom headers
- CPE identifiers for mapping to the NVD vulnerability database
-
/compareendpoint for side-by-side stack analysis - Webhook alerts for tech change monitoring
- Real-time analysis with 24-hour caching
Weaknesses:
- Smaller signature database (3,500+ vs 111K)
- No historical data (tracks changes going forward, no backfill)
- No browser extension — API-only (with a live demo)
- New product (launched Feb 2026)
Best for: Developers who need programmatic tech detection at a reasonable price, especially security teams (CPE data).
Pricing: The Elephant in the Room
For 5,000 API requests per month:
| BuiltWith | Wappalyzer | DetectZeStack | |
|---|---|---|---|
| Monthly cost | $995 | $450 | $5 |
| Annual cost | $11,940 | $5,400 | $60 |
| Cost per request | $0.199 | $0.090 | $0.001 |
At 25,000 requests/month, DetectZeStack costs $15/month vs $995+ for BuiltWith and $450+ for Wappalyzer. That's a 60x-90x price difference.
Detection Accuracy: A Practical Test
We ran all three tools against github.com:
| Technology | BuiltWith | Wappalyzer | DetectZeStack |
|---|---|---|---|
| Ruby on Rails | Yes | Yes | Yes |
| React | Yes | Yes | Yes |
| Nginx | Yes | Yes | Yes |
| Fastly CDN | No | No | Yes (DNS CNAME) |
| DigiCert TLS | No | No | Yes (TLS cert) |
| CPE identifiers | No | No | Yes |
All three catch major technologies. DetectZeStack's DNS and TLS layers add infrastructure visibility that HTTP-only tools miss. BuiltWith detects more niche technologies thanks to its larger database.
Try It Yourself
curl -s "https://detectzestack.fly.dev/analyze?url=your-site.com" \
-H "X-Api-Key: YOUR_KEY" | jq '.technologies[].name'
Compare results against BuiltWith's free lookup and the Wappalyzer extension. For most developer use cases, DetectZeStack catches everything you need — plus infrastructure — at a fraction of the cost.
Get your free API key on RapidAPI — 100 requests/month, no credit card required.
What tech detection tools do you use? I'd love to hear about your use cases in the comments.
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