Wappalyzer Alternatives: Better Tools for Tech Stack Research

Wappalyzer has been the go-to browser extension for identifying website technologies since 2008. Pop it open on any site, and it tells you the CMS, analytics tools, JavaScript frameworks, and other technologies running under the hood. For casual tech lookups, it’s great. For serious B2B sales prospecting, market research, or competitive intelligence, it falls short in ways that matter.

If you’ve hit Wappalyzer’s limitations and need something more powerful, this guide breaks down the best alternatives, what each does well, and which one fits your specific use case.

Where Wappalyzer Falls Short

Before we dive into alternatives, it helps to understand exactly why people look for them. Wappalyzer works well for its original purpose (identifying technologies on a single website), but B2B professionals need more:

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No Bulk Lookups

Wappalyzer’s free tier is a one-site-at-a-time browser extension. If you need to analyze 500 companies to build a prospect list, you’d have to visit each site individually and manually record the results. That’s not scalable for sales teams running outbound campaigns.

Limited Search and Filtering

Want to find every company using Shopify + Klaviyo in the United States with 50-200 employees? Wappalyzer’s browser extension can’t do that. Their paid plans offer some lookup capabilities, but the search and filtering experience is built around technology detection, not B2B prospecting.

Pricing Scales Steeply

Wappalyzer’s free tier is limited to basic detection. Their paid plans start at $250/month for limited lookups and scale to $850+/month for larger volumes. For teams that need substantial data access, the cost adds up quickly and the per-lookup pricing model makes it hard to do exploratory research without watching your budget.

API Limitations

Wappalyzer offers an API, but it’s credit-based and relatively expensive for high-volume use cases. Teams that want to integrate technographic data into their CRM or sales automation workflows often find the API costs prohibitive at scale.

No Historical Data

Wappalyzer shows you what a site is running right now. It doesn’t tell you what technologies a company added recently, removed, or switched from. Historical technology data is valuable for identifying companies in transition, which is exactly when they’re most likely to buy.

The Best Wappalyzer Alternatives in 2026

1. StackWho

Best for: B2B sales teams, recruiters, and market researchers who need to search for companies by technology stack.

StackWho takes a fundamentally different approach than Wappalyzer. Instead of analyzing one website at a time, StackWho maintains a searchable database of companies and their technology stacks. You search by technology (or combination of technologies), apply filters for company size, industry, and location, and get a list of matching companies with contact data.

What StackWho does better than Wappalyzer:

Search-first interface. Start with the technology you care about and find all companies using it. No need to know the company first.
Combinatorial filtering. Search for companies using React + TypeScript + AWS, or Shopify + Klaviyo + Gorgias. Multiple technology filters combined with firmographic data create precision targeting.
Company data included. StackWho includes company information, employee counts, industry classification, and location data alongside technology profiles. You don’t need a separate data provider.
Built for prospecting. The entire product is designed around the B2B use case of finding and reaching companies by their tech stack, not just identifying what one website runs.

Limitations:

Focused on the company-search use case rather than real-time single-site analysis.
Newer platform, so the total database size is still growing.

Pricing: Free tier available for basic searches, with paid plans for full data access and exports.

Try StackWho’s technology search to see how it compares to your current workflow.

2. BuiltWith

Best for: Enterprise teams that need the largest possible technology detection database and are willing to pay a premium for it.

BuiltWith is the heavyweight in the technographic data space. Founded in 2007, it has been crawling and cataloging website technologies longer than almost anyone else. Its database covers tens of millions of websites and tracks hundreds of thousands of individual technologies.

What BuiltWith does better than Wappalyzer:

Massive database. BuiltWith tracks more technologies across more websites than any other provider. If a technology exists and is detectable, BuiltWith probably tracks it.
Historical data. BuiltWith maintains historical records of technology adoption, so you can see when a company added or removed a technology. This is powerful for identifying companies in transition.
Technology market share reports. Detailed reports on technology adoption trends, market share, and competitive positioning.
Lead lists and exports. Build lists of companies using specific technologies and export them with contact information.

Limitations:

Expensive. BuiltWith’s pricing starts at $295/month for their basic plan and goes up to $995/month for the pro plan. Enterprise pricing is custom and can run into the thousands monthly.
Complex interface. The sheer volume of data can make the interface overwhelming, particularly for users who just need to build targeted prospect lists.
Overkill for simple use cases. If you just need to find companies using a specific technology and reach out to them, BuiltWith’s depth of data may be more than you need (and more than you want to pay for).

Pricing: Starting at $295/month. Free tier limited to basic lookups.

3. SimilarTech

Best for: Digital marketing agencies and sales teams focused on the marketing technology and advertising technology ecosystem.

SimilarTech specializes in tracking marketing and advertising technologies, including ad networks, tag managers, analytics tools, marketing automation platforms, and related categories. It’s particularly strong at mapping the martech landscape.

What SimilarTech does better than Wappalyzer:

Marketing tech depth. SimilarTech goes deeper into marketing and advertising technologies than general-purpose tools, tracking specific ad placements, pixel implementations, and martech stack configurations.
Lead generation tools. Built-in lead generation features let you build prospect lists based on marketing technology adoption.
Technology adoption alerts. Get notified when companies adopt or drop specific marketing technologies, creating timely outreach opportunities.

Limitations:

Narrower technology coverage outside the marketing and advertising space. If you need to track programming languages, cloud infrastructure, or development frameworks, SimilarTech is less comprehensive.
Smaller overall database compared to BuiltWith or StackWho for non-marketing technologies.

Pricing: Custom pricing, generally mid-range for professional plans.

4. WhatRuns

Best for: Individual users and small teams that want a free or low-cost browser extension with more detail than Wappalyzer’s free tier.

WhatRuns is the closest direct alternative to Wappalyzer in terms of form factor. It’s a browser extension that identifies technologies on the website you’re currently visiting. It often detects technologies that Wappalyzer misses, particularly WordPress plugins, JavaScript libraries, and smaller or niche tools.

What WhatRuns does better than Wappalyzer:

Broader detection in some categories. WhatRuns often catches WordPress plugins, specific font services, and niche JavaScript libraries that Wappalyzer overlooks.
Follow feature. You can “follow” a website and get alerts when its technology stack changes. This is a lightweight way to track competitor or prospect technology changes without a paid subscription.
More generous free tier. WhatRuns provides solid functionality without requiring a paid plan for basic use.

Limitations:

Like Wappalyzer, it’s a one-site-at-a-time tool. No bulk lookups, no database search, no prospect list building.
No API for integration into workflows.
Limited company data beyond technology detection.

Pricing: Free browser extension with optional premium features.

5. NerdyData

Best for: Developers and technical researchers who want to search for specific code patterns across the web, not just named technologies.

NerdyData takes a unique approach: instead of detecting known technologies, it lets you search for specific code snippets, JavaScript calls, HTML patterns, or meta tags across millions of websites. This is incredibly powerful for niche use cases that general technology detection tools miss.

What NerdyData does better than Wappalyzer:

Code-level search. Find websites using a specific API endpoint, a particular JavaScript function call, or even a custom HTML attribute. No other tool offers this level of granularity.
Custom technology detection. If the technology you’re looking for isn’t in Wappalyzer’s predefined list, NerdyData can still find it by searching for its code signature.
Competitive intelligence. Find every website using a competitor’s embed code, tracking pixel, or SDK.

Limitations:

Requires technical knowledge to write effective search queries. This isn’t a point-and-click tool for non-technical sales reps.
Less effective for back-end technologies that don’t leave visible signatures in front-end code.
Database coverage can be inconsistent for smaller or less-trafficked websites.

Pricing: Free tier with limited searches, paid plans starting at $49/month.

6. HG Insights (formerly HG Data)

Best for: Enterprise sales and marketing teams that need technographic data integrated into account-based marketing (ABM) platforms and enterprise CRMs.

HG Insights is an enterprise-grade technographic data provider that focuses on integrating technology intelligence into existing enterprise workflows. They combine multiple data collection methods (web crawling, job posting analysis, intent data, and partner data) to build comprehensive technology profiles of companies.

What HG Insights does better than Wappalyzer:

Enterprise integrations. Native integrations with Salesforce, HubSpot, Marketo, 6sense, Demandbase, and other enterprise platforms.
Technology spend estimates. HG Insights doesn’t just tell you what technologies a company uses; it estimates how much they spend on those technologies. This is valuable for sizing deals and prioritizing accounts.
Back-end technology detection. By analyzing job postings, partner networks, and other signals beyond web crawling, HG Insights can detect technologies that aren’t visible in a website’s front-end code.
Intent data. Combines technographic data with purchase intent signals to identify companies actively evaluating new technologies.

Limitations:

Enterprise pricing. HG Insights is designed for large organizations with annual contracts typically starting in the five-figure range. It’s not accessible for small teams or individual researchers.
Complexity. The platform requires setup, training, and ongoing management. It’s not a tool you sign up for and start using in five minutes.

Pricing: Custom enterprise pricing, typically $15,000+/year.

Comparison Table: At a Glance

Here’s how the major alternatives stack up across the dimensions that matter most:

Bulk company search: StackWho (yes), BuiltWith (yes), SimilarTech (yes), WhatRuns (no), NerdyData (yes, code-level), HG Insights (yes)
Browser extension: StackWho (no), BuiltWith (yes), SimilarTech (yes), WhatRuns (yes), NerdyData (no), HG Insights (no)
Historical data: StackWho (limited), BuiltWith (yes, extensive), SimilarTech (yes), WhatRuns (follow alerts), NerdyData (limited), HG Insights (yes)
Company/contact data: StackWho (yes), BuiltWith (yes), SimilarTech (yes), WhatRuns (no), NerdyData (limited), HG Insights (yes, extensive)
Free tier usefulness: StackWho (good), BuiltWith (limited), SimilarTech (limited), WhatRuns (good), NerdyData (limited), HG Insights (none)
Best for: StackWho (B2B prospecting), BuiltWith (comprehensive research), SimilarTech (martech focus), WhatRuns (casual lookups), NerdyData (code-level search), HG Insights (enterprise ABM)

Choosing the Right Tool for Your Use Case

If You’re a B2B Sales Rep or SDR

You need to build targeted prospect lists fast and reach out with tech-relevant messaging. StackWho is the best fit because it’s designed specifically for this workflow: search by technology, filter by company attributes, and get actionable company data. BuiltWith works too but costs more and has a steeper learning curve.

If You’re a Market Researcher or Analyst

You need comprehensive data, historical trends, and broad coverage. BuiltWith is the gold standard for depth and breadth of data. HG Insights adds spend estimates and intent data if your budget supports it.

If You’re a Digital Marketing Agency

You’re prospecting for clients based on their marketing technology stack. SimilarTech’s marketing tech specialization gives you the most relevant data. StackWho is a strong complement for broader technology-based prospecting beyond just martech.

If You’re a Developer or Technical Researcher

You need to find websites using specific code patterns, APIs, or libraries that aren’t in standard technology databases. NerdyData’s source-code search is uniquely powerful for this use case.

If You’re a Solo Operator or Freelancer

You need basic technology detection without a big subscription. WhatRuns gives you more detection coverage than Wappalyzer’s free tier, and StackWho’s free tier lets you do basic technology-based company searches.

If You’re an Enterprise RevOps Team

You need technographic data flowing into Salesforce, powering ABM campaigns in Demandbase or 6sense, and enriching account records at scale. HG Insights is built for this workflow, though the price tag reflects it.

Can You Use Multiple Tools Together?

Absolutely, and many teams do. A common setup is:

StackWho for prospecting: Build initial prospect lists by searching for companies using target technologies.
WhatRuns or Wappalyzer for verification: When you’re about to reach out to a specific prospect, do a quick live check to confirm their current stack.
BuiltWith for deep research: When you need historical data or comprehensive technology profiles for key accounts, use BuiltWith for the deep dive.

This layered approach gives you the best of each tool without overpaying for capabilities you only need occasionally.

The Bottom Line

Wappalyzer is a fine browser extension for quickly checking what technologies a website uses. But if you’re trying to use tech stack data for B2B sales, market research, or competitive intelligence, you need tools that go beyond one-at-a-time lookups.

The right alternative depends on your specific workflow: StackWho for B2B prospecting, BuiltWith for comprehensive research, SimilarTech for marketing tech focus, NerdyData for code-level search, and HG Insights for enterprise ABM. Test the free tiers, map them to your actual workflow, and invest in the tool that saves you the most time and generates the most pipeline.

Ready to try a search-first approach to tech stack research? Search StackWho’s database and find companies by the technologies they use.