Free lookups
$0
Free
US$0. Single-site lookups on the website, and free API endpoints (Free API, Trends, WhoAmI, Usage) at 1 request a second.
API included
Comparison
BuiltWith vs TheirStack
BuiltWith detects what a website runs, across 127,960 web technologies (its plans page, October 2026) with detection dates and spend estimates. TheirStack reads job posts, so it also sees back-end and internal tools invisible on websites, plus hiring signals and webhooks. TheirStack's API starts at US$49 a month with a free tier; BuiltWith plans start at US$295 a month, with API lookups bought as separate credits.
Pick BuiltWith if
- You need what a website runs: analytics, ecommerce, CMS and other front-end tools, with first and last…
- You want lists of every site using a technology, with spend, revenue and employee filters (Lists needs a…
Pick TheirStack if
- You need back-end or internal tools that only show up in job posts
- You want hiring signals: who is hiring for which role or technology
BuiltWith
Enrichment, Sourcing
TheirStack
Signals, Sourcing
At a glance
BuiltWith
- From
- US$295/moFrom, US$2,950/yr
- Free plan
- YesFree site lookups and free endpoints
- Cost per unit
- 1 credit per domain lookup
- MCP server
- Official
TheirStack
- From
- US$49/moFrom for 1,500 API credits
- Free plan
- Yes50 company, 200 API credits/mo
- Cost per unit
- 1 credit/job, 3 per company
- MCP server
- Official
Where they differ
16 points side by side. Open a value for the full detail.
| What | BuiltWith | TheirStack |
|---|---|---|
| Website technology-detection database and APIA website technology-detection database and API: what a domain runs, with history and spend estimates, and lists of every site using a technology. | Job postings, technographics, buying-intent APIA job postings, technographics and buying-intent API built from company career sites, applicant tracking systems and job boards. | |
| From US$295/mo, US$2,950/yrPlans from US$295 a month (Basic), or US$2,950 a year billed yearly. API lookups are paid with account credits bought separately; BuiltWith's in-app credit page starts at US$99 for up to 2,000. Verified 2026-10-25. | From US$49/mo for 1,500 API creditsAPI credit subscriptions from US$49 a month for 1,500 API credits. App company credits from US$109 one-time for 1,000. Verified 2026-10-25. | |
| 1 credit per domain lookup1 credit per domain lookup (also per domain in bulk, per relationship, keyword or trust lookup). BuiltWith's in-app credit page shows account credits falling from US$0.020 each above 2,000 to US$0.0010 above 10 million. | 1 credit/job, 3 per company1 API credit per job returned, 3 per company returned, 3 per company for technographics or buying intents. At US$49 for 1,500 credits that is about US$0.033 a credit. | |
| Credits never expireBuiltWith's in-app credit page says credits never expire. Lists and Keyword Search need a subscription; lookup credits alone do not unlock them. | Paid credits roll over 12 monthsUnused paid credits roll over for 12 months. Repeat API calls for the same records are charged each time. Counting results costs the price of one record unless nothing matches. | |
| Free site lookups and free endpointsFree single-site lookups on the website, and free API endpoints (Free API, Trends, WhoAmI, Usage) limited to 1 request a second. | 50 company, 200 API credits/moFree tier: 50 company credits and 200 API credits a month, capped at 25 results a page, 5 pages and 400 requests a day until you pay once. Free credits are a monthly allowance: on our account they carried an expiry date 30 days after signup, when the free plan renews. | |
| Any account with credits; Lists need planAny account with credits can call the lookup APIs. The Lists and Keyword Search APIs need a subscription, and the live feed needs an active plan. | Every plan, including FreeEvery plan, including Free, with lower limits until the first payment. App company credits are for the web app; API calls spend API credits. | |
| Authorization: API headerAPI key in an Authorization: API header, or a KEY query parameter kept for compatibility. Guests can pay per lookup without an account. | Bearer API keyAPI key as a Bearer token; keys can carry an expiry date and are shown once. | |
| 10 requests/sec per keyUp to 8 concurrent requests and 10 requests a second per key; free endpoints 1 a second. | 4 requests/sec per user (paid)4 requests a second per user once you have paid; free accounts also get 10 a minute, 50 an hour and 400 a day. | |
| Bulk jobs up to 5,000 domains, no webhooksBulk Domain jobs take up to 5,000 domains; results are deleted after the first read. No webhooks; a live feed of new detections runs over WebSocket on an active plan. | Webhooks on saved searchesWebhooks on saved searches for new jobs, closed jobs and new matching companies; each record delivered costs credits. Bulk datasets as JSON, CSV or Parquet through sales. | |
YesOfficial MCP at https://api.builtwith.com/mcp with a Bearer key, covering domain, relationships, keywords, trends and more; it can also be paid per lookup without an account. | YesOfficial MCP at https://api.theirstack.com/mcp with OAuth or an API key: 71 tools for job and company search, technographics, webhooks and lists, billed in API credits. Some tools change account settings, so review approvals. | |
| 127,960 technologies tracked (Oct 2026)Technologies detected on websites (name, category, first and last detected), spend estimates, sales revenue, company details, shared analytics IDs and IPs. 127,960 tracked technologies on its plans page in October 2026, with webpages updated weekly. | 225M jobs, 51M technographics, 388M intentsJobs (225M records, about 305k new a day), technographics inferred from job posts (51M records) and buying intents (388M records), with company firmographics. | |
| Front-end tools with a web footprintFront-end and web tools that leave a footprint on the site. Back-end or internal tools with no web footprint are not visible. | Tools named in job postsTools named in job posts, including back-end and internal ones, plus who is hiring for which roles. It does not crawl websites for tags. | |
| CRM integration on paid plansCRM integration is listed on its paid plans. Other connections run through the REST API or the MCP server. | Clay, Zapier, n8n, Make, DatabarClay, Zapier, n8n, Make, Databar and LinkedIn audiences. | |
| No SOC 2 or ISO claimNo SOC 2 or ISO claim on its plans page; it states lists of individuals are exportable within GDPR restrictions. | GDPR and DPA; no SOC 2 or ISOPublishes a GDPR overview and a DPA. States it has not completed a SOC 2 audit and is not ISO 27001 certified. | |
| Internal use only, no resaleInternal business use only; no resale, no supplying the data to other data providers, no training competing AI. | No competing product or resaleNo building a competing product or reselling data in a way that competes with TheirStack. | |
| Web technographics per domainWeb and ecommerce technographics per domain, and lists of every site running a given technology. | Hiring and back-end tech signalsHiring signals and back-end tech-stack signals, with webhook feeds and a free tier to start. |
No row matches in this view.
Pricing, plan by plan
US dollars as each vendor's page showed them on 25 Oct 2026. One panel per tool; switch each between monthly and annual billing (an annual price is the monthly rate when you pay for the year up front).
BuiltWith
6 plans · API reviewBasic
$295/mo
billed monthly
$245.83/mo
billed annually
US$295 a month billed monthly, or US$2,950 a year billed yearly.
Plan details
2 technologies, 2 keywords, 2 retail reports, 1 login, CRM integration. API lookups use separately bought credits.
Pro
$495/mo
billed monthly
$412.50/mo
billed annually
US$495 a month billed monthly, or US$4,950 a year billed yearly.
Plan details
Unlimited technologies, keywords and retail reports, 1 login.
Team
$995/mo
billed monthly
$829.17/mo
billed annually
US$995 a month billed monthly, or US$9,950 a year billed yearly.
Plan details
Unlimited, with unlimited Pro logins.
Show all 6 plansShow fewer plans
API credits (account)
One-off credits, minimum 2,000; the in-app table shows US$99 flat for up to 2,000, then US$0.020 a credit to 10,000, falling to US$0.0010 above 10 million.
API included
Plan details
That in-app page says credits never expire. A KYC check comes before checkout.
Guest credits (no account)
Through Stripe or USDC payment flows without an account: US$0.50 buys 10 lookups (US$0.0495 each).
API included
TheirStack
20 plans · API reviewFree
$0
Free
US$0. 50 company credits and 200 API credits a month. Until you pay once: 25 results a page, 5 pages, and 4 requests a second, 10 a minute, 50 an hour, 400 a day.
API included
API, 1,500 credits a month
$49/mo
billed monthly
US$49 a month for 1,500 API credits.
API included
Plan details
Unused credits roll over for 12 months. Above 5,000,000: custom pricing.
API, 5,000 credits a month
$100/mo
billed monthly
US$100 a month for 5,000 API credits.
API included
Plan details
Unused credits roll over for 12 months. Above 5,000,000: custom pricing.
API, 10,000 credits a month
$169/mo
billed monthly
US$169 a month for 10,000 API credits.
API included
Plan details
Unused credits roll over for 12 months. Above 5,000,000: custom pricing.
Show all 20 plansShow fewer plans
API, 20,000 credits a month
$240/mo
billed monthly
US$240 a month for 20,000 API credits.
API included
Plan details
Unused credits roll over for 12 months. Above 5,000,000: custom pricing.
API, 50,000 credits a month
$400/mo
billed monthly
US$400 a month for 50,000 API credits.
API included
Plan details
Unused credits roll over for 12 months. Above 5,000,000: custom pricing.
API, 100,000 credits a month
$600/mo
billed monthly
US$600 a month for 100,000 API credits.
API included
Plan details
Unused credits roll over for 12 months. Above 5,000,000: custom pricing.
API, 200,000 credits a month
$900/mo
billed monthly
US$900 a month for 200,000 API credits.
API included
Plan details
Unused credits roll over for 12 months. Above 5,000,000: custom pricing.
API, 500,000 credits a month
$1,200/mo
billed monthly
US$1,200 a month for 500,000 API credits.
API included
Plan details
Unused credits roll over for 12 months. Above 5,000,000: custom pricing.
API, 1,000,000 credits a month
$1,500/mo
billed monthly
US$1,500 a month for 1,000,000 API credits.
API included
Plan details
Unused credits roll over for 12 months. Above 5,000,000: custom pricing.
API, 2,000,000 credits a month
$2,300/mo
billed monthly
US$2,300 a month for 2,000,000 API credits.
API included
Plan details
Unused credits roll over for 12 months. Above 5,000,000: custom pricing.
API, 5,000,000 credits a month
$5,500/mo
billed monthly
US$5,500 a month for 5,000,000 API credits.
API included
Plan details
Unused credits roll over for 12 months. Above 5,000,000: custom pricing.
App, 1,000 company credits
$98.10/mo
billed monthly
For the web app, not the API: US$109 one-time, or US$98.10 a month as a subscription (10% off).
No API
Plan details
Credits roll over for 12 months.
App, 5,000 company credits
$179.10/mo
billed monthly
For the web app, not the API: US$199 one-time, or US$179.10 a month as a subscription (10% off).
No API
Plan details
Credits roll over for 12 months.
App, 10,000 company credits
$269.10/mo
billed monthly
For the web app, not the API: US$299 one-time, or US$269.10 a month as a subscription (10% off).
No API
Plan details
Credits roll over for 12 months.
App, 20,000 company credits
$359.10/mo
billed monthly
For the web app, not the API: US$399 one-time, or US$359.10 a month as a subscription (10% off).
No API
Plan details
Credits roll over for 12 months.
App, 50,000 company credits
$494.10/mo
billed monthly
For the web app, not the API: US$549 one-time, or US$494.10 a month as a subscription (10% off).
No API
Plan details
Credits roll over for 12 months.
App, 100,000 company credits
$674.10/mo
billed monthly
For the web app, not the API: US$749 one-time, or US$674.10 a month as a subscription (10% off).
No API
Plan details
Credits roll over for 12 months.
App, 200,000 company credits
$899.10/mo
billed monthly
For the web app, not the API: US$999 one-time, or US$899.10 a month as a subscription (10% off).
No API
Plan details
Credits roll over for 12 months.
Datasets
Custom quote
Jobs, technographics and buying-intent datasets as JSON, CSV or Parquet, with history and/or updates.
Plan details
Talk to sales.
Which one to pick
Choose BuiltWith if
- You need what a website runs: analytics, ecommerce, CMS and other front-end tools, with first and last detected dates.
- You want lists of every site using a technology, with spend, revenue and employee filters (Lists needs a subscription).
- You do ecommerce research by product, SKU or sales revenue.
- You want to pay per lookup without an account, through its guest payment options.
Choose TheirStack if
- You need back-end or internal tools that only show up in job posts.
- You want hiring signals: who is hiring for which role or technology.
- You want webhooks when new jobs or matching companies appear.
- You want to start free, then pay from US$49 a month for API credits.
If neither fits: BuiltWith's plans include exportable contact names, emails and titles publicly listed with businesses, and TheirStack has no email or phone database. To find and verify the right buyers' work emails, see the email-finding guide.
How to find a person's work email addressWant us to build it for you?
Choosing between BuiltWith and TheirStack, or moving from one to the other? Tell us your setup. We will show you how we would run it, and what we would check first.
Questions people ask
What is the difference between BuiltWith and TheirStack?
BuiltWith detects technologies on websites, so it sees front-end and web tools with first and last detected dates. TheirStack reads job posts, so it sees tools companies hire for, including back-end ones with no web footprint, plus hiring signals.
Which is cheaper to start with?
TheirStack has a free tier with 200 API credits a month, then API plans from US$49 a month. BuiltWith plans start at US$295 a month, and API lookups use account credits bought separately, from US$99 for up to 2,000 on BuiltWith's in-app credit page. BuiltWith's free API endpoints cover basic lookups at 1 request a second. Prices verified 25 Oct 2026.
Do BuiltWith or TheirStack have webhooks?
TheirStack does: webhooks on saved searches fire on new jobs, closed jobs and new matching companies, and each record delivered costs credits. BuiltWith has no webhooks; it offers a WebSocket live feed of new detections on an active plan.
Can I use BuiltWith or TheirStack with Claude or another AI agent?
Yes. Both run official MCP servers: BuiltWith at https://api.builtwith.com/mcp with a Bearer key, and TheirStack at https://api.theirstack.com/mcp with OAuth or a key. Calls are billed in each vendor's credits.
Related
Read from builtwith.com/plans, theirstack.com/en/pricing and each tool's API docs. Verified 25 Oct 2026.
