BuiltWith vs TheirStack
An independent, review-free comparison compiled by the SaaSTracker editorial team. Both products are profiled in full, and neither can pay for placement here.
The short answer
Both sides assessedBuiltWith compared with TheirStack
TheirStack infers technology use from job postings and sells credits from $49 a month, which is a completely different detection method: it catches internal tools that never touch a public web page, such as a data warehouse or a CRM. BuiltWith only sees what renders in a browser. Use TheirStack for back-office and infrastructure software, BuiltWith for anything that leaves a fingerprint on the site itself, and both if you sell something that could be either.
TheirStack compared with BuiltWith
BuiltWith observes what renders in a browser across roughly 492 million domains with eighteen years of dated history, from $295 a month with the API priced separately. TheirStack infers from job ads, catching internal tools BuiltWith can never see, from $49 a month with the API included. If your product leaves a fingerprint on a website, BuiltWith is more reliable; if it lives in a back office or a data stack, TheirStack is the only one of the two that will find your buyers.
Choose BuiltWith if
Companies whose product is installed on a website and who sell against a named competitor: Shopify and WooCommerce app vendors, martech and analytics tools, payment and checkout products, agencies pitching replatforming work, and anyone doing genuine market sizing on technology adoption.
Choose TheirStack if
Vendors selling back-office, infrastructure, or developer software whose product never appears on a customer's website, recruiters and staffing firms who need hiring signal at scale, and technical GTM operators who would rather hit an API or an MCP server than click through a dashboard.
Side by side
13 attributes| Attribute | BuiltWith | TheirStack |
|---|---|---|
| Category | Signals | Signals |
| Starting price | $0 for individual site lookups, then $295 per month for Basic (free plan available) | Free tier on signup, then $49 per month for 1,500 credits or $109 once for 1,000 credits (free plan available) |
| Pricing model | Flat monthly or annual subscription by plan, with no per-row export credits; the lookup API is a separate metered product. | Credit-based, sold either as a monthly subscription or as one-time packs with no subscription; unlimited team members and no per-seat charge. |
| Free plan | Individual site lookups through the website and browser extensions are free forever and unlimited; list building, exports, alerts, and API access are not included. | Free credits on signup with access to job search, company search, company lookup, enrichment, exports, and email alerts, at low volume. |
| Free trial | No published free trial on paid plans | Not a time-limited trial; a free credit allowance is included on signup |
| Best for | Companies whose product is installed on a website and who sell against a named competitor: Shopify and WooCommerce app vendors, martech and analytics tools, payment and checkout products, agencies pitching replatforming work, and anyone doing genuine market sizing on technology adoption. | Vendors selling back-office, infrastructure, or developer software whose product never appears on a customer's website, recruiters and staffing firms who need hiring signal at scale, and technical GTM operators who would rather hit an API or an MCP server than click through a dashboard. |
| Setup time | An hour to build a first list, longer to trust it. Sign up, pick your tracked technologies, and run a query; the work is in learning which filter combinations produce a list that is actually addressable rather than 40,000 rows of noise. | Twenty minutes to a first list. Sign up, spend free credits on a query against your best-guess ICP, and read the source postings to see whether the extraction is catching what you expected. API integration is another afternoon. |
| Learning curve | Moderate and front-loaded. The interface offers little guidance and the filter grammar rewards experimentation. Most of the skill is knowing which technology combinations imply a real buying situation, and that is domain knowledge rather than software knowledge. | Low for the app, moderate for the judgement. The filters are straightforward; the skill is learning which technology mentions actually indicate ownership rather than aspiration, and building filters that exclude recruitment agency postings. |
| Platforms | Web application, Chrome extension, Firefox extension, REST API, Bulk datasets | Web application, REST APIs for jobs, companies, technographics, and buying intents, MCP servers, CSV export |
| Compliance | GDPR obligations apply to the contact data appended to exports, No publicly advertised SOC 2 attestation | Job posting data is published business information rather than personal data, which keeps privacy exposure low, No publicly advertised SOC 2 attestation |
| Founded | 2007 | 2021 |
| Headquarters | Sydney, Australia | Barcelona, Spain |
| Ownership | Bootstrapped | Privately held |
Strengths and limitations
BuiltWith
Strengths
- The deepest technographic history available anywhere: dated install and removal records per domain going back to 2007, which no competitor can retroactively manufacture.
- Removal alerts are a genuinely differentiated buying signal, because a company that just uninstalled a tool is shopping right now rather than someday.
- Exports are unmetered on paid plans, so the cost per record collapses at volume instead of climbing the way credit-based vendors do.
- CRM integrations to six systems are included on every paid tier rather than reserved for an enterprise plan.
Limitations
- The $295 entry price with a two-technology cap is a hard wall for small teams, and there is no published trial to de-risk it.
- The interface is dated and dense, and there is effectively no onboarding, so the first week is spent learning a filter grammar by trial and error.
- Support is thin by design in a company with a handful of staff; expect email responses, not a customer success manager.
- Detection is fingerprint-based, so a technology loaded through a tag manager, a server-side proxy, or a reverse-proxied subdomain can be missed entirely, and a leftover script from a tool nobody uses any more will read as an active install. Both directions of error are common.
TheirStack
Strengths
- The job posting source sees software that no website crawler ever will, which makes TheirStack the only practical technographic option for back-office, data, and infrastructure vendors.
- Every extracted signal links back to the source posting, so claims are verifiable rather than a black box, and a rep can quote the actual requirement on a call.
- Ingestion of roughly 300,000 postings a day means the freshness ceiling is about a day, far better than the weekly or opportunistic crawls elsewhere in this category.
- The API is included in the same credit balance as the app rather than priced separately, and MCP servers are available, which is a genuinely developer-friendly posture at this price.
Limitations
- Everything is inference. A technology mentioned in a posting is strong evidence, not proof, and companies routinely list tools they are migrating away from, tools a single team uses, and tools copied from a stale template.
- Companies that do not advertise roles publicly are effectively absent, which skews coverage toward larger and faster-growing organisations and away from small established businesses.
- Recruitment agency postings are a persistent noise source: the hiring company in the record may be the agency rather than the end employer, and filtering that out takes deliberate work.
- No storefront or consumer-web technographics, so ecommerce app vendors get nothing useful here.
Pricing compared
BuiltWith
Flat monthly or annual subscription by plan, with no per-row export credits; the lookup API is a separate metered product.
- Free lookups$0
- Basic$295
- Pro$495
- Team$995
Model it at two volumes. A niche app vendor tracking one competitor and exporting 2,000 rows a month pays $295 on Basic, which works out to roughly 15 cents per record, and that is expensive against a general contact database until you remember no contact database can tell you who installed a specific tag last week. A serious agency on Pro at $495 pulling 40,000 rows across a dozen technologies pays about a cent a record, which is cheap by any comparison. The value curve is steeply in favour of heavy users, and the $295 floor with a two-technology cap is the worst deal in the table. If you cannot see yourself running more than one query a month, use the free lookups and buy something else.
TheirStack
Credit-based, sold either as a monthly subscription or as one-time packs with no subscription; unlimited team members and no per-seat charge.
- Free$0
- Monthly API subscription, entry$49
- Monthly API subscription, mid$169
- Monthly API subscription, high volume$400
- One-time credit packs$109
Model it at two volumes. A founder validating a market buys the $109 one-time pack, pulls 1,000 company records with their inferred stacks, and never pays again; at roughly 11 cents a record that is cheap for data nobody else has. A vendor running continuous outbound sits on the $169 monthly plan for 10,000 credits, or around 1.7 cents a credit, and pulls a few thousand qualified companies a month with the API doing the work. At $400 for 50,000 the unit cost falls under a cent. The pricing is the most honest in the category: no seats, no separate API bill, no annual lock-in, and a free tier that actually lets you check whether your buyers appear in job ads before you spend anything.
Editorial verdict on each
BuiltWith
BuiltWith is the definitive technographic dataset and it prices like a tool that knows it has no real substitute. The install and removal history is the asset: knowing that 300 companies dropped your competitor's tag last month is a better prospecting list than any general contact database can produce, and no vendor can go back and manufacture eighteen years of dated records. Buy Pro at $495 if technology installs are the literal trigger for your sale and you will pull thousands of rows a month, because unmetered exports make the cost per record trivial at that volume. Do not buy Basic at $295 hoping to test the idea cheaply, because two tracked technologies is not a test, it is a constraint; use the free lookups or start with Wappalyzer instead. And go in understanding that you are buying a list, not a motion: BuiltWith hands you the names and expects you to already know what to do with them.
Read the full BuiltWith profileTheirStack
TheirStack is the best-priced serious signal tool in this category and the only sensible option if the software you sell lives somewhere a crawler cannot reach. Reading job ads rather than websites is not a clever workaround, it is a structurally better view of a company's internal stack, and 300,000 new postings a day gives it a freshness advantage that weekly-crawl vendors cannot close. Buy the $109 one-time pack first and check whether your buyers actually post job ads, because if they do not, nothing else about the product matters. If they do, the $169 monthly plan with unlimited seats and the API included is a genuinely cheap foundation for an account-selection motion. Just build the verification habit early: this is inference, every record links to the posting it came from, and the teams that read the source before dialling get very different results from the ones that trust the label.
Read the full TheirStack profileBuiltWith profile last reviewed 2026-08-22; TheirStack last reviewed 2026-08-22. Pricing is compiled from public sources and can change without notice. See our methodology.