7 Best BuiltWith Alternatives: Cheaper Ways to Find Company Tech Stacks

BuiltWith has been the go-to tool for looking up what technologies websites use since 2007. But at $295 per month for a basic plan and $495+ for anything with real data depth, it’s priced out of reach for most sales reps, recruiters, and smaller teams who just need reliable tech stack data without the enterprise price tag.

The good news: the technographic data market has matured significantly. There are now several strong alternatives that offer comparable or better data at a fraction of the cost. Some are free. Some take a completely different approach to sourcing tech stack intelligence.

We tested all of them head-to-head. Here are the 7 best BuiltWith alternatives in 2026, ranked by value for money.

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Why Look for a BuiltWith Alternative?

Before we dive into the list, let’s be clear about why people leave BuiltWith. It’s not that the tool is bad. BuiltWith has genuinely deep data and has been doing this longer than anyone. But there are legitimate pain points:

Price: The Pro plan starts at $295/month. The Team plan is $495/month. Enterprise pricing goes well beyond that. For individual sales reps or small teams, this is hard to justify.
Outdated interface: BuiltWith’s UI hasn’t changed much in years. It works, but it feels clunky compared to modern SaaS tools.
Data freshness: Some users report that BuiltWith’s data can lag behind actual technology changes, particularly for smaller websites that aren’t crawled as frequently.
Overkill for simple lookups: If you just need to know whether a company uses Salesforce or HubSpot, paying $295/month feels excessive.
Limited CRM integrations: BuiltWith offers CSV exports and some integrations, but it’s not as seamlessly connected to modern sales workflows as newer tools.

With that context, here are the alternatives worth considering.

1. StackWho – Best Overall BuiltWith Alternative

StackWho takes a fundamentally different approach to technographic data. Instead of just crawling website source code, StackWho aggregates data from multiple sources including job postings, developer communities, public filings, and web crawling to build a more complete picture of what technologies companies actually use internally, not just what’s visible on their marketing website.

What Makes StackWho Different

The core difference is depth. BuiltWith can tell you that a company uses Google Analytics on their website. StackWho can tell you that same company uses Kubernetes for orchestration, Snowflake for their data warehouse, and is actively hiring for Golang engineers, which suggests they’re building new microservices in Go.

This matters because B2B sales teams don’t just care about frontend technologies. If you’re selling a DevOps tool, a monitoring platform, or a cloud service, you need to know what’s happening behind the firewall, not just what JavaScript libraries are loaded on a homepage.

Key Strengths

Deep stack visibility: Backend, infrastructure, and internal tools, not just frontend technologies
Company search by technology: Search for all companies using a specific technology and filter by size, industry, and location
Fresher data: Continuous monitoring from multiple data sources means changes are detected faster
Modern interface: Clean, fast search experience designed for sales workflows
Affordable pricing: Significantly cheaper than BuiltWith for comparable functionality

Best For

B2B sales teams selling developer tools, cloud infrastructure, or SaaS platforms. Recruiters looking to identify companies using specific tech stacks for targeted outreach. Market researchers who need a complete picture of technology adoption, not just surface-level web technologies.

2. Wappalyzer – Best Free Browser Extension

Wappalyzer is probably the most popular free alternative to BuiltWith. Its browser extension lets you see what technologies any website uses just by visiting the page. It’s instant, it’s visual, and for one-off lookups it’s excellent.

Key Strengths

Free browser extension: Works in Chrome, Firefox, and Edge with no account required
Instant results: Click the icon while on any website to see detected technologies
Good technology categorization: Technologies are neatly organized by category (CMS, analytics, frameworks, etc.)
Open source detection: The core technology fingerprinting is open source and community-maintained

Limitations

Surface-level only: Can only detect technologies that are visible in the page source, HTTP headers, or JavaScript objects
No bulk lookup on free plan: The free extension works one site at a time. Bulk lookups require paid plans starting at $100/month
Paid plans get expensive quickly: The API and bulk lookup features rival BuiltWith’s pricing at higher tiers
No backend technology detection: Won’t reveal server-side languages, databases, or infrastructure choices

Best For

Individual users who need occasional, one-at-a-time tech lookups and don’t want to pay anything. Great as a complement to a more comprehensive tool like StackWho for quick spot-checks.

3. SimilarTech – Best for Market Research

SimilarTech positions itself as a market intelligence platform rather than just a tech lookup tool. It focuses heavily on technology market share data, adoption trends, and competitive analysis at the market level rather than the individual company level.

Key Strengths

Market share data: See how technologies compare in terms of overall adoption across the web
Trend analysis: Track whether technologies are gaining or losing market share over time
Lead generation: Identify companies that recently adopted or dropped specific technologies
Geographic filtering: Filter technology usage by country or region

Limitations

Pricing is opaque: No public pricing page, requiring you to request a demo for quotes
Primarily web technologies: Like BuiltWith, focused on what’s detectable through web crawling
Smaller database: Covers fewer websites than BuiltWith or Wappalyzer
Less useful for individual lookups: Built more for market analysis than one-off company research

Best For

Market research teams and analysts who need macro-level technology adoption data. Less suited for individual sales prospecting where tools with company-level search are more practical.

4. HG Insights – Best for Enterprise Go-to-Market Teams

HG Insights (formerly HG Data) is the enterprise heavyweight of technographic data. It’s used by major tech companies to size their total addressable market (TAM) and prioritize accounts based on technology fit. If BuiltWith is too basic for your needs, HG Insights is the step up.

Key Strengths

Massive data coverage: Claims to track technology installations across millions of companies worldwide
TAM analysis: Purpose-built tools for sizing addressable markets based on technology usage
Salesforce and CRM integrations: Deep integrations that enrich your CRM data with technographic signals
Intent data: Combines technographic data with technology buying intent signals
Verified data: Uses multiple validation sources to reduce false positives

Limitations

Enterprise pricing: Starts well into five figures annually. This is not a tool for individual reps or small teams
Complex onboarding: Requires implementation support and training to get full value
Overkill for simple use cases: If you just need to look up tech stacks, this is far more platform than you need
Long sales cycle: Expect demos, procurement, and multi-week onboarding

Best For

Enterprise GTM teams at large tech companies who need to build and size their TAM based on technology adoption. For mid-market and smaller teams, StackWho offers a similar depth of data at a dramatically lower price point.

5. Slintel (6sense) – Best for Sales Intelligence Workflows

Slintel was acquired by 6sense in 2021 and has been integrated into the 6sense revenue intelligence platform. If you’re already a 6sense customer, Slintel’s technographic data is a natural add-on. As a standalone technographic tool, it’s harder to justify.

Key Strengths

Buying intent signals: Combines tech stack data with buyer intent for more actionable prospecting
6sense integration: Seamless if you’re already in the 6sense ecosystem
Contact data: Includes decision-maker contact information alongside technographic data
Renewal and churn detection: Identifies companies whose contracts with competitors may be expiring

Limitations

Tied to 6sense: As a standalone product, Slintel is effectively being sunset in favor of the 6sense platform
Premium pricing: 6sense is an enterprise platform with enterprise pricing to match
Technographic data is one piece: You’re buying a full revenue intelligence platform, not just tech stack data

Best For

Existing 6sense customers who want to add technographic signals to their revenue intelligence workflows. For teams who primarily need technographic data, standalone tools like StackWho are more focused and cost-effective.

6. WhatRuns – Best Free Alternative for Casual Use

WhatRuns is a lightweight, free browser extension that’s remarkably similar to Wappalyzer. It detects technologies on any website you visit and presents them in a clean popup interface. For zero-budget individual use, it’s one of the best options available.

Key Strengths

Completely free: No paid tiers, no account required, no usage limits on the browser extension
Clean interface: Simple, well-designed popup that’s easy to scan quickly
Good detection accuracy: Comparable to Wappalyzer for common web technologies
Lightweight: Minimal browser performance impact

Limitations

No bulk capabilities: Strictly one-website-at-a-time manual lookups
No API: Can’t integrate with sales workflows or CRM systems
Web technologies only: Limited to what’s detectable on the frontend
No export or saved history: You’ll need to manually record results

Best For

Individuals who need quick, occasional tech lookups with zero budget. Not suitable for team use, prospecting at scale, or any workflow that requires data export or integration.

7. NerdyData – Best for Source Code Search

NerdyData takes a unique approach: instead of categorizing technologies, it lets you search the actual source code of millions of websites. Want to find every website that includes a specific JavaScript snippet, tracking pixel, or code pattern? NerdyData can do that.

Key Strengths

Source code search: Search for any code pattern, not just pre-defined technology categories
Highly flexible: Find websites using obscure or custom technologies that other tools miss
Competitive intelligence: Identify which companies are using competitors’ tracking pixels or SDKs
Lead generation: Build prospect lists based on very specific technical criteria

Limitations

Requires technical knowledge: You need to know what code patterns to search for
Frontend only: Can only search publicly visible source code
Smaller index: Doesn’t cover as many websites as BuiltWith or Wappalyzer
Niche use case: Most sales teams don’t need raw source code search

Best For

Technical marketers and sales engineers who know exactly what code patterns they’re looking for. For broader technology search and prospecting, StackWho’s search interface is more practical for most users.

Comparison Table: BuiltWith Alternatives at a Glance

Here’s how all seven alternatives stack up against BuiltWith across the dimensions that matter most:

StackWho: Deep stack visibility (frontend + backend + infrastructure), affordable pricing, modern UI, company search by technology, best for B2B sales and recruiting
Wappalyzer: Free browser extension, frontend technologies only, paid plans for bulk/API, best for one-off lookups
SimilarTech: Market share and trend data, enterprise pricing, best for market research and analyst teams
HG Insights: Enterprise-grade TAM sizing, five-figure annual pricing, best for large GTM teams
Slintel (6sense): Buying intent + technographics, bundled with 6sense platform, best for existing 6sense customers
WhatRuns: Free browser extension, no bulk or API, best for casual individual use
NerdyData: Source code search, requires technical expertise, best for finding specific code patterns

Which BuiltWith Alternative Should You Choose?

The right choice depends entirely on your use case and budget:

If you’re a B2B sales team selling developer tools or SaaS: StackWho is the strongest choice. You need deep tech stack data (not just frontend technologies) and the ability to search for companies by the technologies they use. StackWho’s combination of depth, usability, and price makes it the best fit for sales prospecting workflows.

If you just need occasional one-off lookups: Start with Wappalyzer or WhatRuns. They’re free, they work in your browser, and they’re fine for quick checks. When you need to do more than one lookup at a time, you’ll want to upgrade to a paid tool.

If you need market-level technology trend data: SimilarTech or HG Insights will give you the macro view that BuiltWith’s market reports provide, though at significant cost.

If you’re already using 6sense: Adding Slintel’s technographic data to your existing platform is a natural fit. Don’t buy 6sense just for the technographic data though.

If you’re on a tight budget but need more than free extensions: StackWho’s pricing tiers are designed for individual reps and small teams who can’t justify $295+/month but need real technographic data for prospecting.

The Bottom Line

BuiltWith pioneered the technographic data space, and it still has the largest index of web technologies. But the market has moved on. Modern alternatives offer better interfaces, deeper data (especially for backend and infrastructure technologies), and more flexible pricing.

For most B2B sales teams, recruiters, and market researchers, StackWho offers the best combination of data depth, usability, and value. Start with a search to see the difference for yourself.

Ready to find companies by their tech stack? Try StackWho’s free search and see what technologies your target accounts are using, including the backend and infrastructure tools that BuiltWith can’t detect.