BuiltWith alternative: scan any tech stack free.
Paste a domain below for a free instant tech-stack lookup - a real BuiltWith alternative you can run right now, no signup. Then read my honest test of the main alternatives, with a side-by-side table and FAQ.
By Dvir Aviam, Founder, JobsPipe · Updated 2026-06-01 · 9 min read
The best free BuiltWith alternative is a live tech-stack scan: paste a domain into the tool at the top of this page and get the technologies on its public site in seconds, no signup. For frontend-only checks the Wappalyzer extension and crft.studio are also free; for backend stacks pulled from hiring data, TheirStack is the pick.
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Detects 7,000+ technologies from a live scan of the public site - frontend, analytics, CDN, payment, and SaaS tools. No account, no card.
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I tested the main BuiltWith alternatives
BuiltWith is the incumbent, but it is not the only way to find out what a website runs - and for a lot of jobs it is the most expensive way. I ran the same checks through six tools, including our own, and wrote down what each is actually good at. One caveat up front: JobsPipe is our product, so I have put the honest limitations of our scan in writing rather than burying them.
See also our deeper Wappalyzer alternatives comparison, the broader tools directory, and the technographics pillar if you want the category background.
Comparison table
| Tool | Free option | API | Detection | Best for |
|---|---|---|---|---|
 JobsPipe(us) | Yes - instant domain scan, no signup | Yes - REST API on the free tier | 7,000+ technologies from a live scan | Free scan + API + a jobs-and-technographics join |
 BuiltWith | Single-site lookup only; no bulk free tier | Paid plans only | Large frontend technology index | Historical trend data and brand recognition |
 Wappalyzer | Free extension; 50 lookups/month registered | Yes - credit-based, paid | Frontend technology fingerprints | The default browser-extension tech check |
 TheirStack | Free tier with limited credits | Yes - paid plans | Tech derived from job postings | Backend stacks at hiring-active companies |
 crft.studio | Yes - free single-site lookup tool | No public API | Frontend detection on one site | A quick free one-off check, no account |
 RB2B | Free tier for person-level reveal | Integrations, no general tech API | Visitor de-anonymization, not tech scan | Identifying who visits your own site |
Pricing and limits change often - verify current plans on each vendor’s site before you buy.
The reviews
Best for: Developers and data buyers who want a free instant scan, a real API, and the option to join tech detection with hiring data.
Full disclosure - this is our tool, so I am putting the honest caveats up front. The scan above is the whole pitch: paste a domain, get back the technologies running on its public site in a couple of seconds, free, no account. It detects 7,000+ technologies from a live scan rather than a pre-crawled index, so it reflects what the site serves right now. The differentiator is the API on the free tier plus a jobs-and-technographics join, so you can ask 'which companies run Shopify and are hiring Rails engineers' in one place. It is not a historical-trends archive like BuiltWith, and a single live scan is not a 500-million-site database - if you need decade-long adoption curves, BuiltWith still owns that.
- Free instant domain scan with no signup, embedded right at the top of this page.
- Detects 7,000+ technologies from a live scan, so results reflect the current site.
- REST API available on the free tier, not gated behind an enterprise quote.
- Joins technographics with jobs data, which frontend-only scrapers cannot do.
- No multi-year historical trend archive the way BuiltWith has.
- Live scan reads the public site, so behind-the-firewall tools are out of scope.
- Younger product with a smaller integration ecosystem than BuiltWith.
Best for: Teams that specifically need BuiltWith's historical trend data or its brand recognition on stakeholder reports.
BuiltWith is the incumbent and the free single-site lookup is genuinely useful for a one-off check. Where it frustrated me is the gap between the free page and the paid product: the Basic plan caps you to two technologies, and any real bulk or API workflow lands you on Pro pricing fast. The historical trend data is the real moat - if you need to see how Shopify adoption moved over a decade, nothing else here matches it. For just 'what does this site run today', it is the most expensive way to find out.
- Longest-running historical dataset on web-technology adoption.
- Free single-site lookup is fine for ad-hoc curiosity.
- Brand recognition means reports get accepted without explanation.
- Basic plan caps you at two technologies for the price.
- No free bulk lookups or free API access.
- Frontend-only, so backend and internal tooling are invisible.
Best for: Anyone who wants the de-facto browser extension for quick checks, plus a clean credit-based API when they scale up.
Wappalyzer is what most people actually reach for. The free browser extension is fast and accurate for single sites, and the API is the cleanest in this group if you want to wire detection into an enrichment pipeline. The catch is the free tier - 50 lookups a month, and credits expire, so it is not a free bulk solution. For frontend detection at a lower price than BuiltWith, it is the safe default.
- Free, accurate browser extension that is the category standard.
- Clean credit-based API built for engineers.
- Bulk lookups scale to large lists on paid plans.
- Free tier is only 50 lookups/month and credits expire.
- Frontend-only detection, same blind spots as BuiltWith.
- Lead-list filtering is thinner than sales-led platforms.
Best for: Sales teams whose buyers are hiring-active and who want backend stacks that frontend scrapers cannot see.
TheirStack takes a different route: it reads the tech stack out of job postings instead of scraping the live site. That is the one approach here that surfaces backend and internal tooling BuiltWith fundamentally cannot detect, and every detection links back to the posting as evidence. The tradeoff is coverage - it only sees companies that post jobs, and the signal lags reality by a hiring cycle. Indie-friendly pricing makes it easy to pair with a live scanner.
- Detects backend stacks invisible to frontend scrapers.
- Each detection links to the verifying job posting.
- Indie-priced free tier and paid plans.
- Only covers companies that actually post jobs.
- Signal lags reality by a hiring cycle.
- Not a substitute for live frontend detection.
Best for: A free, no-account single-site lookup when you just need to check one domain and move on.
crft.studio is a free tool page, and that is exactly why it ranks for this term: zero friction, paste a domain, see the stack. It is great for a one-off and proves the point that the winning format for 'BuiltWith alternative' is a free instant tool, not a paywall. There is no public API and no bulk workflow, so it stays a single-site utility rather than something you build on.
- Genuinely free single-site lookup with no account.
- Fast and frictionless for a one-off check.
- Clean result page, easy to read.
- No public API to automate against.
- No bulk lookup or list enrichment.
- Frontend detection only.
Best for: Teams that want to de-anonymize visitors on their own site rather than scan a third party's stack.
RB2B shows up in this conversation but it is a different job. It identifies the people and companies visiting your own website, not the technology stack running on someone else's. If your real question is 'who is on my site right now', RB2B answers it. If your question is 'what does this domain run', it is the wrong tool - a live tech scan or a job-posting detector fits better.
- Person-level visitor identification with a free tier.
- Useful for warming up inbound on your own site.
- Integrates with common sales and marketing stacks.
- Not a tech-stack scanner for third-party domains.
- Coverage is US-weighted for person-level reveal.
- Different category from BuiltWith entirely.
BuiltWith alternative FAQ
Is there a free BuiltWith alternative?+
Yes. The fastest free BuiltWith alternative is a live tech-stack scan: paste a domain into the tool at the top of this page and you get the technologies on its public site in a couple of seconds, no signup. crft.studio and the Wappalyzer browser extension are also free for single-site checks. What no one offers free is unlimited bulk lookups with lead-list export - that workflow is paid everywhere.
BuiltWith vs Wappalyzer - which is better?+
For most teams Wappalyzer is the better value. Detection coverage for frontend technologies is comparable, the API is cleaner, and paid plans run lower than BuiltWith at equivalent volume. Stay on BuiltWith only if you specifically need its multi-year historical trend data, or if non-technical stakeholders trust the BuiltWith brand on reports. For one-off checks, both have a free path - Wappalyzer's extension and BuiltWith's free single-site lookup.
How accurate are BuiltWith alternatives?+
Accuracy depends on method. Live frontend scanners (JobsPipe, Wappalyzer, crft.studio) are highly accurate for technologies that leave a fingerprint in the page - analytics, CDNs, frameworks, payment, and SaaS widgets - and reflect the current site. They cannot see backend or internal tools that do not touch the frontend. Job-posting detectors like TheirStack catch those backend stacks but lag by a hiring cycle and only cover companies that post jobs. Running a live scan plus a job-posting source together gives the most complete picture.
Which BuiltWith alternatives have an API?+
JobsPipe offers a REST API on its free tier. Wappalyzer and TheirStack offer APIs on paid plans, and BuiltWith's API is paid only. crft.studio has no public API. If API access without an enterprise quote is the priority, start with the free JobsPipe scan above and the API behind it.
Can I join tech-stack data with hiring data?+
That is the JobsPipe differentiator. Frontend scrapers tell you what a company runs today; job postings tell you what it is hiring to build next. JobsPipe joins technographics with jobs data, so you can ask questions like 'which companies run Shopify and are hiring Rails engineers' in one query. TheirStack derives tech from postings but does not run a live frontend scan, so it sits on the other side of that join.
Is a free domain scan the same as a 500-million-site database?+
No, and we will not claim it is. A live scan reads one domain on demand and returns the technologies it can detect on the public site - we detect 7,000+ technologies that way. It is not a pre-crawled archive of hundreds of millions of historical sites. If you need decade-long adoption trends across the whole web, BuiltWith's historical dataset is still the tool for that. If you need an accurate, current read on a specific domain plus an API, the scan above does the job.
Further reading
Wappalyzer alternatives
Free options first, FOSS forks, and paid replacements.
Technographics, explained
What technographic data is and how to use it for GTM.
Tech-stack lookup
Scan any domain and browse recent and featured scans.
All tool comparisons
Every alternatives guide we have published.
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