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Best tech stack tracking tools (2026): what we use, and which kind of technographic data fits your list

Tech stack tracking tools tell you which software a company runs, and when that changes. Sales teams use this technographic data to build lists of companies on a competitor, on a tool they integrate with, or big enough on a platform to need what they sell.

Below is what OneGTM uses, then the website scanners and the deeper technographic providers, with what each vendor publishes about price. The thing to understand before you buy: a tool that scans websites only sees what loads in the browser. Back-office software like a data warehouse or an ERP shows up in job posts and install data, not page source. Pick the source that can actually see the tools you care about.

By Garrett Wolfe, founder of OneGTM (Clay Artisan Solutions Partner) and former GTM engineer at Unify. Updated .

Key takeaways

  • We use LeadMagic technographics at 1 credit per company and route other lookups through Deepline.
  • Website scanners (BuiltWith, Wappalyzer) see front-end tools: analytics, chat widgets, ecommerce platforms, tag managers.
  • Job-post based providers (TheirStack, Sumble, PredictLeads) find back-end tools that never touch the website.
  • HG Insights and 6sense sell technographics inside enterprise contracts with no public price.
  • A tech change, such as adding or dropping a competitor, is a stronger signal than a static install.

What OneGTM uses for tech stack data

Tech stack is a filter and a personalization field for us, not a list source on its own. LeadMagic is our default lookup. When a client needs a back-end tool or a niche product, we test providers through Deepline first and only buy direct once we know which one has coverage.

LeadMagic

OneGTM uses this

Enrichment API with a technographics endpoint that takes a company domain and returns the detected tech stack. It charges nothing on a miss, which makes it cheap to run across a full TAM.

Best for: Cheap tech stack lookups across a large account list

Pricing: Essential $99/month for 5,000 credits; Growth $249/month for 20,000; Professional $499/month; Ultimate $849/month. Two months free billed annually. Technographics is 1 credit per company.

Deepline

OneGTM uses this

GTM data platform with one credit balance across dozens of providers, including BuiltWith and PredictLeads. We use it to compare technographic coverage on a client's real accounts before committing to any one source.

Best for: Testing several technographic sources on one list

Pricing: Pay as you go at $0.10 per credit with no platform fee.

Clay

OneGTM has used this

Spreadsheet-style enrichment tool that pulls tech stack data from several integrated providers into a table column, so you can filter and score accounts on it alongside firmographics.

Best for: Teams already building lists in Clay

Pricing: Free plan with 100 data credits a month. Launch $167/month billed annually ($185 monthly); Growth $446/month billed annually ($495 monthly). Enterprise custom.

Website technology scanners

These crawl websites and fingerprint the scripts, tags, and platforms they load. Strong on ecommerce, marketing, and analytics tools. Blind to anything that runs behind a login or inside the company.

BuiltWith

The largest website technology database, with lists of every site using a given technology, historical install and removal dates, and spend estimates.

Best for: Lists of every site on a given front-end technology

Pricing: Basic $295/month, Pro $495/month, Team $995/month. Annual plans available. API pricing not listed on the plans page.

Wappalyzer

Technology lookup tool with a browser extension, lead lists by technology, website alerts when a stack changes, and an API.

Best for: Small teams that want lookups, alerts, and an extension

Pricing: Free with 50 technology lookups a month. Pro $250/month, Business $450/month, Enterprise from $850/month. 17% off billed annually.

Technographic data from job posts, installs, and intent

These infer the stack from job descriptions, install data, and other sources, so they can see tools like Snowflake, Salesforce, or SAP that never appear in page source.

TheirStack

Job posting and technographic database that detects tools from the job descriptions companies publish, with first and last seen dates per technology.

Best for: Back-end and data tools named in job descriptions

Pricing: API from $49/month for 1,500 credits, up to $5,500/month for 5,000,000. A technographics lookup is 3 credits. App credits from $109 one-time for 1,000 companies. Free trial.

Sumble

Account intelligence built from job posts and other public data, with tech, job function, and firmographic search filters, people search, and signals.

Best for: Searching accounts by the technologies their teams use

Pricing: Free with 500 credits a month and 7 signals a week. Pro $99/month with 9,900 credits and up to 20 signals a day. Enterprise custom.

PredictLeads

Company data API covering technologies detected, job openings, news events, and key customers, priced per API call.

Best for: Developers who want tech data and other signals from one API

Pricing: Free for 100 API calls a month. Then $0.04 per credit with a $40 monthly minimum, falling to $0.002 at volume. Flat-file Enterprise access is custom.

HG Insights

Enterprise technographic provider covering installed products, IT spend, and contract data, plus buyer intent. Plans are Starter, Growth, and Enterprise, usually on two-year terms.

Best for: Enterprise sellers who need IT spend and install depth

Pricing: Custom pricing through a demo. No free trial.

6sense

ABM and sales intelligence platform. Its technographics came from the Slintel acquisition and are included in all three sales intelligence plans, next to intent and predictive scoring.

Best for: Teams buying intent, ABM, and technographics in one contract

Pricing: Custom pricing, sold through a demo.

Prices are from each vendor's site as of October 2026 and change often, so check before you buy. This is an opinionated list, not a paid ranking. Some links are referral links that may earn us a credit; that never changes what you pay or who makes the list.

Tech stack tracking tools compared

ToolBest forStarting price
LeadMagic (OneGTM uses)Cheap tech stack lookups across a large account list$99/month; 1 credit per company
Deepline (OneGTM uses)Testing several technographic sources on one list$0.10/credit, no platform fee
ClayTeams already building lists in ClayFree; Launch $167/month billed annually
BuiltWithLists of every site on a given front-end technologyFrom $295/month
WappalyzerSmall teams that want lookups, alerts, and an extensionFree; Pro $250/month
TheirStackBack-end and data tools named in job descriptionsAPI from $49/month
SumbleSearching accounts by the technologies their teams useFree; Pro $99/month
PredictLeadsDevelopers who want tech data and other signals from one APIFree; $0.04/call
HG InsightsEnterprise sellers who need IT spend and install depthCustom pricing
6senseTeams buying intent, ABM, and technographics in one contractCustom pricing

Starting prices as published by each vendor in October 2026.

Front-end scans vs back-end technographics

BuiltWith and Wappalyzer load a company's website and match what they see against known fingerprints: Shopify, HubSpot forms, Intercom, Google Tag Manager. If it runs in the browser, they are accurate and they can tell you the day it appeared.

Most B2B buying happens around tools that never load on the website: the CRM, the warehouse, the ERP, the data pipeline. For those you need a source that reads job posts (TheirStack, Sumble, PredictLeads) or install and spend data (HG Insights). A job post that asks for three years of Snowflake is good evidence the company runs Snowflake.

Before buying, list the five technologies that matter most for your ICP and check each provider's coverage on 50 accounts you already know.

Tech changes are the signal, not the install

Knowing a company runs a competitor is a targeting filter. Knowing they added or dropped it last month is a buying signal. Look for providers that record first seen and last seen dates, and set alerts on the changes.

  • A competitor disappearing from the site: they may be mid-switch, or just signed with someone else.
  • A complementary tool appearing: they now have the problem your product solves next.
  • A new job post naming a tool they do not use yet: a migration or new team is coming. See job posting data.
  • A spike in posts mentioning your category: budget is likely approved.

Using tech stack data in outbound

Use tech data first to cut the list, then to write the first line. Filtering a TAM to companies on a tool you integrate with is the cheapest win, and it saves enrichment spend on accounts that could never buy.

In the copy, name the tool only when you are sure. A wrong guess about someone's stack is worse than no personalization, and website scanners do pick up old tags that nobody removed.

  • Filter the account list on must-have and must-not-have technologies before you find any contacts.
  • Score accounts higher for complementary tools and recent changes.
  • Write integration-led copy for accounts on a partner tool.
  • Write displacement copy only where a competitor is confirmed by two sources.

When to get help with technographic targeting

Most teams buy a technographic database, filter on one tool, and stop. The value comes from checking coverage on your own accounts, mixing front-end and job-post sources, and turning stack changes into plays.

OneGTM tests technographic sources against your ICP, builds tech-based scoring into your TAM, and wires stack changes into outbound. You own the data and the workflows.

  • Your ICP depends on a tool that website scanners cannot see.
  • You want a list of every company running a competitor, with the date they started.
  • You are paying for an enterprise technographic contract and not using it.
  • You want stack changes to start a sequence automatically.

Book a call

Tech stack tracking FAQ

What are the best tech stack tracking tools?
BuiltWith and Wappalyzer are the standard website scanners, TheirStack, Sumble, and PredictLeads read job posts and other sources to find back-end tools, and HG Insights and 6sense sell technographics in enterprise contracts. OneGTM uses LeadMagic technographics for cheap lookups and tests other sources through Deepline.
What is technographic data?
Technographic data is information about the software and hardware a company uses, such as its CRM, analytics, cloud provider, or ecommerce platform. Providers like BuiltWith collect it from websites, while TheirStack and HG Insights infer it from job posts and install data.
How much does technographic data cost?
Wappalyzer has a free tier with 50 lookups a month and paid plans from $250 a month. BuiltWith starts at $295 a month, TheirStack's API at $49 a month, Sumble Pro at $99 a month, and LeadMagic charges 1 credit per company. HG Insights and 6sense use custom pricing.
Can BuiltWith see a company's CRM or data warehouse?
Usually not. BuiltWith and Wappalyzer only see what loads on the public website, so tools like Snowflake, SAP, or an internal CRM are invisible to them. Job-post based providers such as TheirStack and Sumble are better for back-end tools.
How do I find companies using a competitor's software?
Search the competitor in BuiltWith or Wappalyzer if it loads on the website, or in TheirStack or Sumble if it shows up in job descriptions. Check the first and last seen dates, then confirm with a second source before you write displacement copy.
Is a tech stack change a buying signal?
Yes, often a stronger one than the install itself. TheirStack, BuiltWith, and Wappalyzer record when a technology appears or disappears, and a competitor dropping off or a complementary tool arriving are both good reasons to reach out.

Targeting by tech stack but not sure the data is right?

Related

  • Best buying signal tools: Signal platforms and data feeds for job changes, hiring, funding, and intent, with what OneGTM uses.
  • Job posting data for sales: Job postings APIs, scrapers, and datasets, with pricing and how to turn a post into a meeting.
  • Best intent data providers: Bombora, G2, TrustRadius, 6sense and more for third-party intent, with how to test them.
  • Best data enrichment tools: The enrichment stack OneGTM runs, plus the main alternatives and what each costs.
  • TAM calculator: Estimate what it costs to enrich your TAM: firmographics, AI site reads, signals, contacts and verified emails, priced from real vendor rates.
  • Best ABM platforms: ABM suites, account-based ad tools, and the build-your-own stack, with pricing.
  • Best job change tracking tools: Champion tracking platforms and data APIs, with pricing and how to test one before you buy.
  • Funding data for sales: Where to get new funding rounds, with pricing and the play that turns a raise into a meeting.

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