Best BuiltWith Alternatives in 2026 (Technographic Data and Tech Stack Lookup)

A BuiltWith alternative is any tool that shows which software a company runs, or which companies run a tool, without BuiltWith's price or its website-first view. Founded in 2007, BuiltWith tracks 127,851 technologies with data from 491.9 million domains, and its list plans start at $295 a month.

The bigger gap is what a website scan can see. In runsonwhat's sample of 143,424 tool matches, 26.5% had no trace in website code. They came only from DNS, email, certificate or subprocessor records.

Our top pick is runsonwhat's free tech stack lookup, which reads those records and keeps the proof for every match. Below are 12 alternatives, ranked, with prices checked on each vendor's site in October 2026.

Key takeaways

• runsonwhat is the best BuiltWith alternative in 2026 for finding companies by the tools they run, including tools that never load on a website.
• 26.5% of runsonwhat's tool matches come only from DNS, email, certificate or subprocessor records, which website-only scanners miss.
• BuiltWith remains the benchmark for website technology, with data from 491.9 million domains and list plans from $295 to $995 a month.
• Wappalyzer is the closest like-for-like swap, with a free browser extension and lead lists from $250 a month.
• TheirStack builds its data from job posts, which reveal back-end tools but show hiring intent rather than proof of use.
• HG Insights, 6sense and ZoomInfo sell technographics inside enterprise contracts with custom pricing.

What are the best BuiltWith alternatives in 2026?

The best BuiltWith alternatives in 2026 are runsonwhat for company lists with proof, Wappalyzer for browser lookups, TheirStack for job-post signals and HG Insights for enterprise install-base data. Store Leads covers e-commerce, and Bloomberry tracks churn on named vendors. Apollo.io, PredictLeads and WebReveal suit tight budgets.

What is technographic data, and why look beyond BuiltWith?

Technographic data records which software a company uses, so sales and marketing teams can target accounts by their stack. Providers collect it from website code, DNS and email records, certificate logs, job posts and subprocessor lists. Each source sees a different slice, and website-only scanners see just the first.

• Website code. Scripts, tags and headers show analytics, ad pixels, chat widgets and the CMS.
• DNS and email records. Verification tokens, SPF and MX entries reveal mail providers, sending services and verified SaaS accounts.
• Certificate logs. Public certificates expose subdomains such as help.acme.com that point at a vendor, and when they appeared.
• Job posts. Roles that name a tool reveal back-end and data software, but they show hiring intent, not live use.
• Subprocessor lists. Privacy law makes companies name the vendors that handle customer data.

Website scanners miss email, identity, collaboration and AI tools because those never load on a page. For Atlassian, Anthropic, OpenAI, Zoom, Slack, Notion, Rippling and Vanta, none of runsonwhat's sampled matches came from website code.

The 2025 martech landscape lists 15,384 solutions, per our marketing technology stack statistics, so no single detection method covers them all.

1) runsonwhat

runsonwhat finds every company that uses a tool, or shows the full tech stack of any domain. Each match keeps the public record that gave it away, such as a DNS entry, a subdomain or a script. It suits sales, RevOps and founders who sell into stacks a website scan can't see.

Best for: Lists of companies by the software they run, including email, security, collaboration and AI tools.

Key capabilities

• Reads five kinds of public record: DNS and mail settings, certificate logs and subdomains, website scripts, Google Tag Manager tags and subprocessor lists. HTTP Archive's monthly Chrome crawl of about 11 million homepages adds runtime tags.
• Tracks 1,418 tools across 1,787,212 company domains and 14.6 million matches. 338 of those tools can be spotted from a DNS verification record alone.
• Tool pages such as companies that use HubSpot show the count, top industries, size, country share and 30-day new customers: 92,110 companies as of October 2026.
• Tool pages split companies into "Using it now", "Renewing soon" (vendor certificate expiring within 90 days) and "Dropped it", with 15,299 certificate-proven adoption dates back to 2010.
• Tracks AI tools found through DNS verification, with 59,904 companies on Anthropic as of October 2026, plus OpenAI, Cursor and AI ad platforms such as ChatGPT Ads.
• Filters by industry, size, country and LinkedIn, exports to CSV and shows lift: HubSpot customers are 5.5× more likely to use ZoomInfo.

Why it ranks #1

BuiltWith starts from the web page, while runsonwhat starts from the company and reads everything it has set up in public. A company appears only when a direct record names the vendor, and weak hints are stored but not listed.

Under its published match rules, absent tools are never inferred, a company's own products are skipped (stripe.com is not a Stripe customer) and counts are lower bounds. Lookups run live, DNS is rechecked weekly, websites about monthly and certificate logs continuously.

It is candid about limits: it can't see server-only APIs such as Vapi, agents inside other products, or desktop apps nobody verified a domain for. A lone DNS verification token can outlive a cancelled subscription, so treat it as a strong hint, not proof of a live contract.

Pricing

Website lookups are free and open. Full company lists open with a free Google sign-in, tool pages show the first 40 companies before it, and no paid plans are published.

2) Wappalyzer

Wappalyzer is a technology profiler best known for its free browser extension, which shows a site's CMS, analytics and frameworks in one click. It tracks 8,166 web technologies across 106 categories. It suits marketers and sellers who want instant answers while browsing.

Best for: Quick lookups while browsing.

Key capabilities

• Extensions for Chrome, Firefox, Edge and Safari.
• Lead lists filtered by technology, market, traffic and geography, with contact fields.
• Alerts for migrations and new tool installs.
• Data from in-house crawlers plus the extension, re-verified about monthly.

Pricing

Free for 50 lookups a month; Plus costs $10/mo. Lead lists start at $250/mo (Pro), then $450/mo (Business) and $850+/mo (Enterprise).

Where it falls short

It reads website code, so tools behind the site stay mostly invisible, and plan credits expire after 60 days.

3) TheirStack

TheirStack finds technology through job postings. It says it tracks 33,000+ technologies across 12 million companies and links every detection to the posts behind it. It suits teams selling to engineering and data buyers, where a job ad naming a database says more than a website tag.

Best for: Back-end and data tools, plus hiring signals.

Key capabilities

• Low, medium or high confidence on each detection.
• First and last seen dates for each technology.
• APIs, datasets and MCP servers for jobs, technographics and buying intent.
• 254 million job postings from over 195 countries.

Pricing

API plans start at $49/mo for 1,500 credits, and app credits start at $109 one-time.

Where it falls short

Every company comes from job postings, which its docs say biases the data toward firms that hire, and a post shows hiring rather than use.

4) HG Insights

HG Insights is an enterprise technographics provider covering installed products, modeled IT spend and contracts. It blends a technology sensor network, public sources and proprietary documents with machine learning and human checks. It suits large B2B vendors planning territories and competitive displacement.

Best for: Enterprise install-base and IT spend data.

Key capabilities

• 13.2 million+ company URLs and 70,000+ technology products.
• More than 10 years of time-series adoption data.
• Modeled IT spend, informed by public contracts where available.
• Salesforce, HubSpot and Snowflake connectors, an API and an MCP server.

Pricing

Custom pricing on a default two-year contract, with no free trial. A free technographic discovery tool exists.

Where it falls short

Unpublished prices and two-year terms rule out most small teams, and spend figures are modeled, not reported.

5) Store Leads

Store Leads is an e-commerce data platform tracking about 14 million active online stores across 415 platforms, including Shopify, WooCommerce and BigCommerce. It records the apps, themes and technologies each store runs. It suits agencies, app developers and SaaS sellers who prospect online brands.

Best for: Shopify and e-commerce prospecting.

Key capabilities

• 8,454 apps and 1,004 technologies, with install dates, updated weekly.
• 40+ attributes across 60 search filters.
• HubSpot, Outreach, Pipedrive and Salesforce integrations.
• API and MCP access from the Pro plan.

Pricing

Premium costs $75/mo, Pro $250/mo, Elite $450/mo and Enterprise $950/mo, with 15% off yearly plans.

Where it falls short

It covers online stores only, so B2B software sellers will find little, and Premium has no CSV export or API.

6) Bloomberry

Bloomberry tracks which companies start and stop paying for 1,700+ B2B products in 190 categories. It reads new subdomains, DNS records, certificate logs and script configurations. It suits teams that sell against a handful of named competitors and care about timing.

Best for: Churn and renewal alerts on specific competitors.

Key capabilities

• 400,000+ subscribe and churn events a month, with dates.
• Churn counted only after a product's endpoint is verified dead.
• Alerts for signups, churn and upcoming renewals.
• A web app and a REST API.

Pricing

App plans cost $199/mo for 2 vendors and $299/mo for 5. API plans match, with 6,633 or 13,000 monthly credits.

Where it falls short

Coverage stops at its product list, new-vendor requests need Enterprise, and per-vendor pricing climbs fast across a category.

7) Similarweb

Similarweb is a digital intelligence platform that acquired SimilarTech and now sells technographics inside its Sales Intelligence product. You can build leads by the technologies a site has installed, then add traffic, country and category filters. It suits sales teams that also want traffic data on prospects.

Best for: Technology targeting plus traffic data.

Key capabilities

• Which technologies a site installed or removed, and for how long.
• Include or exclude technologies and categories in lead searches.
• Datasets covering 8,000+ technologies across 100M+ domains.
• Signals for traffic shifts and technology changes.

Pricing

Sales Intelligence comes in Individual, Business and Enterprise tiers. Rates depend on plan and billing term, so confirm current pricing with Similarweb.

Where it falls short

Detection centers on what websites install, and 8,000+ technologies trails BuiltWith's 127,851.

8) PredictLeads

PredictLeads is a company intelligence data provider that sells technographics alongside job openings, news and financing events. It collects technologies from script tags, DNS records, IP ranges, cookies and job descriptions. It suits data teams that want raw records by API.

Best for: Data teams building their own enrichment.

Key capabilities

• 240,000+ technologies across 99 million+ companies.
• First and last seen dates, a score and a source count per detection.
• API, flat files, webhooks and an MCP server.
• Job openings data on 3 million+ companies.

Pricing

100 free API credits a month, then $0.04 a credit with a $40 monthly minimum.

Where it falls short

It is a data feed first, so it pays off for teams with GTM engineering capacity in house, and unused credits expire each billing period.

9) 6sense

6sense is an account-based marketing and revenue intelligence platform. It added technographics by acquiring Slintel in 2021 and lets teams filter target accounts by technology alongside intent signals. It suits enterprise teams running account-based marketing programs who want stack data next to intent.

Best for: ABM segments that combine technology and intent.

Key capabilities

• 30,000+ technologies and 15.8 million+ companies tracked.
• "Technology Used" filters inside account segments.
• Technographic data packs delivered by SFTP, S3 or Snowflake.
• Intent data in the same platform.

Pricing

Pricing is custom, and its free Sales Intelligence plan ended on 12 August 2026.

Where it falls short

Technographics are one input in a large ABM platform, a heavy buy for lists alone, and its own pages disagree on technology counts.

10) ZoomInfo

ZoomInfo is a B2B contact and company database with technographics built in. Its pipeline tracks more than 30,000 technologies across more than 30 million companies, drawn from 20+ source types. It suits sales teams that want technology filters next to contacts and intent.

Best for: Technology-filtered prospecting with contacts attached.

Key capabilities

• 300 million+ company-technology pairings, per its 2022 announcement.
• Sources include websites, job postings and customer testimonials.
• Alerts when companies add or drop a technology.
• Context on where a tool sits, such as a home-page chatbot.

Pricing

Pricing is custom, its sales plans offer free trials, and technographics draw on advanced credits.

Where it falls short

Prices aren't published, and its most detailed coverage figures date from 2022.

11) Apollo.io

Apollo.io is a sales intelligence and engagement platform with a large contact database and a technology filter. Its API finds companies by the technologies they currently use, across 1,500+ supported tools. It suits small sales teams that want tech targeting, contacts and sequences in one tool.

Best for: Budget prospecting with outreach built in.

Key capabilities

• A downloadable list of supported technologies.
• Contact data, email sequencing and CRM integrations.
• A free plan that needs no credit card.
• Company search by API at 1 credit per 100-result page.

Pricing

Free plan available, and paid plans start at $49 per user a month.

Where it falls short

1,500+ technologies is a fraction of BuiltWith's catalog, and Apollo doesn't document how it detects them.

12) WebReveal

WebReveal is a free website technology scanner that identifies the CMS, frameworks, hosting, analytics and plugins of one site at a time. It claims 980+ technologies across 60+ categories. It suits anyone who needs a fast, free answer about a single website.

Best for: Free one-off scans.

Key capabilities

• A free web scanner and Chrome extension.
• A free API of 20 scans an hour per IP address.
• A bulk scanner with CSV export.
• Results grouped by category, with versions where available.

Pricing

The scanner and extension are free, and bulk scanning starts at $19.99/mo for 100 scans a day.

Where it falls short

Its own blog says it has no prebuilt database of websites by technology, and it marks historical data as unavailable.

How do you choose the right BuiltWith alternative?

Four criteria separate these tools fastest.

Where does it look?

Detection coverage depends on the sources a tool reads. Wappalyzer and WebReveal see marketing and frontend tools well. TheirStack adds back-end software named in job posts. runsonwhat and Bloomberry also read DNS, email and certificate records, where email, identity, collaboration and AI tools show up.

Does each match come with proof?

Proof decides whether a rep can trust a list. In our account-based marketing statistics roundup, 43% of B2B marketers battle unreliable data when choosing targets. runsonwhat names the record behind every match, TheirStack links to job posts and PredictLeads returns a source count.

How fresh is it, and does it track starts and stops?

Displacement plays need to know when a tool arrived or left. Wappalyzer re-verifies monthly, and Bloomberry confirms churn by checking that a product's endpoint is dead. runsonwhat counts a start or stop only between two checks done the same way, and dates adoption from certificates.

Do you need lists or single lookups?

Single lookups are free at BuiltWith, Wappalyzer, WebReveal and runsonwhat. Lists are where prices split: per vendor at Bloomberry, credits at TheirStack and PredictLeads, contracts at HG Insights, 6sense and ZoomInfo. Plan where the list lands too: your CRM, your GTM data infrastructure or the AI SDR platforms we compared.

Why does runsonwhat lead this list?

BuiltWith is still a deep database of website technologies, and its long trend history is hard to match. But many tools B2B teams sell against now live behind the website, in email settings, DNS verification records, subdomains and legal pages. runsonwhat reads all of them and lists a company only when a direct public record names the vendor.

That changes what a list can do. A rep can say a prospect's help center points at Zendesk because the record shows it. Starts, stops and "Renewing soon" flags turn a static list into timing signals. For a feature-by-feature view, read runsonwhat's BuiltWith comparison.

Price is the other gap: BuiltWith's lists start at $295 a month, and runsonwhat publishes no paid plans.

• 26.5% of matches come only from DNS, email, certificate or subprocessor records.
• Proof attached to every match, with weak hints held back.
• 15,299 certificate-proven adoption dates, back to 2010.
• 1,418 tools, with industry, size, country and LinkedIn filters plus CSV export.

Website lookups are free, so start with any domain. Then pick a tool on runsonwhat and sign in with Google, free, to open the full list of companies that use it.

Frequently asked questions

Is there a free alternative to BuiltWith?

Yes. runsonwhat's website lookups are free, and its full company lists open with a free Google sign-in. Wappalyzer's extension is free, with 50 lookups a month on a free account. WebReveal scans single sites free, and WhatRuns is a free Chrome extension.

Is Wappalyzer better than BuiltWith?

Wappalyzer is better for quick checks while browsing, with Plus at $10 a month. BuiltWith tracks far more technologies, 127,851 against 8,166. Lead lists start at $250 a month on Wappalyzer and $295 on BuiltWith. Both center on website technology, so neither sees much behind the site.

How do I find out what tech stack a company uses?

Type the domain into runsonwhat's free site lookup. It reads DNS, email records, subdomains, certificate logs and website code live, and shows each tool with the record behind it. A browser extension such as Wappalyzer covers frontend tools, and job posts hint at back-end ones.

How do I find companies that use HubSpot or Salesforce?

Open the tool's page on runsonwhat. As of October 2026, it lists 92,110 companies on HubSpot and 33,489 companies that use Salesforce, with industry, size, country and LinkedIn filters. BuiltWith and Wappalyzer sell similar lists on paid plans from $295 and $250 a month.

What are technographic data providers?

Technographic data providers sell records of which software companies use, for targeting and scoring accounts. Some scan websites (BuiltWith, Wappalyzer), some read job posts (TheirStack) and some read infrastructure records (runsonwhat, Bloomberry). HG Insights, 6sense and ZoomInfo bundle technographics with firmographics, intent or contacts.

How accurate is BuiltWith?

BuiltWith is accurate for what it is built to see: technologies that leave signals on a website. We found no published accuracy rate on its plans or FAQ pages. Its blind spot is software that never loads on a page, such as email and identity tools.