Growth Stack Inspector
X-ray any website's marketing technology stack. Detect 100+ tools — analytics, ad pixels, CRMs, session replay, A/B testing, tag managers, and consent platforms. Free alternative to BuiltWith and Wappalyzer. No signup.
X-ray any website's
marketing stack.
Detect 100+ marketing, analytics, advertising, and infrastructure technologies in seconds. Built for growth marketers and engineers.
Why marketers inspect competitor tech stacks
Every tool on a competitor's website is a signal. LinkedIn Insight Tag means LinkedIn retargeting. Hotjar means conversion rate optimization. Optimizely means A/B testing. Amplitude alongside GA4 means they care about product analytics, not just traffic. The tools a company invests in reveal where they're focused and how sophisticated their measurement is.
For sales teams, knowing what MarTech a prospect uses is a conversation starter. For marketers, it's competitive intelligence on par with reading their blog. For agencies, it's a fast way to audit a new client's existing setup before the first call.
Free alternative to BuiltWith & Wappalyzer
BuiltWith charges $295/month for their Technographics API. Wappalyzer requires a paid account for more than superficial tech detection. This tool is free, no account required, and built specifically for growth and marketing technology detection.
| Feature | MarketerTools | BuiltWith | Wappalyzer |
|---|---|---|---|
| Marketing-specific detection | ✓ | ✗ | ✓ |
| Ad pixel detection | ✓ | ✗ | ✓ |
| Session replay detection | ✓ | ✗ | ✓ |
| A/B testing detection | ✓ | ✗ | ✓ |
| No signup required | ✓ | ✗ | ✓ |
| Free tier | ✓ | ✗ | ✓ |
| No domain limits | ✓ | ✗ | ✗ |
| API access | ✓ | ✓ | ✗ |
Frequently asked questions
What is a marketing tech stack checker?
A marketing tech stack checker (or martech detector) scans a website's source code, network requests, and JavaScript to identify what marketing tools are installed — analytics, ad pixels, tag managers, CRMs, session replay, and more.
How does the Growth Stack Inspector work?
Enter any public URL and the tool fetches the page, then scans for technology fingerprints — script src attributes, global JavaScript variables, cookie names, network request patterns, and HTML attributes that identify specific marketing tools.
Is this a free alternative to BuiltWith?
Yes. BuiltWith's technology detection starts at $295/month for its API. The Growth Stack Inspector is free with no login required and focuses specifically on marketing and growth technologies rather than all web technologies.
What types of tools does it detect?
The inspector detects: analytics platforms (GA4, Mixpanel, Amplitude, Heap), advertising pixels (Meta, Google Ads, TikTok, LinkedIn, Pinterest), tag managers (GTM, Segment, Tealium), session replay (Hotjar, FullStory, Clarity), A/B testing (Optimizely, VWO), consent management (OneTrust, Cookiebot), and more.
Why would a marketer check a competitor's tech stack?
Knowing which tools a competitor uses gives you intelligence on their measurement sophistication, attribution setup, and testing capabilities. If they run Hotjar and VWO, they're doing conversion optimization. If they have LinkedIn Insight Tag, they're retargeting on LinkedIn. Stack analysis is competitive intelligence for marketers.
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