I tried 10 BuiltWith alternatives – here are ones I actually liked

Last Updated: November 2, 2025

If you want a list of companies that use a specific technology, the #1 tool everyone (annoyingly) recommends is BuiltWith. It’s recommended everywhere!

However, I personally think their data can be stale. They don’t detect backend technologies. And at $199/month, their pricing is pretty expensive.

So I decided to take an afternoon off and try some alternatives. For each of these tools, I signed up for an actual account and tried them. (trust me, most people don’t even do that when they write this type of article! 🤣)

If you’re busy, you can click to jump to a specific tool below that interests you:

[NOTE: If you’re building a BuiltWith alternative and want me to include it, shoot me an email with login details, and I’ll see if I can try it and include it in this list]

#1: Bloomberry – best for finding customers of enterprise B2B products

Unlike BuiltWith, Bloomberry offers data on both web technologies and non-web technologies. So you can find customers of products that leave no footprint on company websites, such as Slack, Zoom, ChatGPT, and Okta and more.

When I searched for “Okta”, Bloomberry was able to find over 10,000 companies that used Okta, and their company details, as you can see in the screenshot below. You probably aren’t going to get this level of accurate data from BuiltWith since they only look at footprints on a company’s website.

In addition, Bloomberry has real-time data. For example, I could see *when* a particular Okta customer started using it, as well as companies that recently churned from Okta.

Bloomberry, also had solid coverage of frontend technologies. For instance, they had data on 380 companies that were using UnifyGTM (a sales platform), a relatively new product that BuiltWith has zero data on.

In terms of churn detection, Bloomberry is fairly quick and smart in detecting when a company has dropped a technology. For instance, it detected onsiteiq.io recently churned from Intercom b/c their Intercom widget stopped working.

When you visit the website onsiteiq.io, you’ll see that they still have the Intercom script embedded on their website, but the widget returns an error, and stopped working. So Bloomberry intelligently knows that OnSiteIQ churned from Intercom.

Limitations

Now, let’s talk about what Bloomberry lacks. Bloomberry doesn’t have much data on frontend frameworks, such as Javascript frameworks. For instance, BuiltWith is able to provide you with a list of over 53,000,000 companies that use ReactJS. Bloomberry has 0 data. Zero, nil, nada.

In addition, BuiltWith has much much more comprehensive coverage when it comes to popular frontend technologies. For instance, if you need a huge, comprehensive static list of sites that use Shopify, or WordPress, BuiltWith is the better tool to use.

Pricing

In terms of pricing, Bloomberry offers a free account with sample data, and pricing starts at $199/month. It is available in both an UI and API, and you can sign up for an account here.

#2: Wappalyzer – very inexpensive/free tool for simple tech lookups

While BuiltWith sometimes has stale data, Wappalyzer is the complete opposite. That’s because they offer a browser extension that detects the tech stack for a website in real-time (They have both a Chrome and Firefox extension).

I decided to give the Wappalyzer Chrome extension a try and when I visited lindy.ai, it displays all the technologies that lindy.ai has installed – and in a very neat, organized manner, I must admit.

The extension shows that lindy.ai has VWO, Posthog, Warmly, Hubspot, etc installed, all of which was accurate when I checked.

One thing I did notice is that Wappalyzer doesn’t have much data on “newer” technologies or products. For instance, I noticed that even though UnifyGTM was installed on a website, it’s missing from Wappalyzer.

But I’m pretty nitpicky. Out of all the browser extensions, Wappalyzer does a very very good job of frontend technology coverage.

Higher accuracy than BuiltWith

Wappalyzer also lets you find companies that use a specific frontend technology. Since they get their data crowdsourced from everyone who uses their browser extension, their data is likely to be more reliable and up to date than BuiltWith.

BuiltWith, on other hand has to constantly recrawl websites on a regular basis, and that takes a while.

Limitations

In terms of backend technology detection, Wappalyzer is pretty weak in that area. Even if they do have data on backend products like Okta, for instance, I wouldn’t trust it because it only detects when a website adds an Okta script to their website (which happens way after someone signs up for Okta, or never for most companies).

Pricing

Wappalyzer has a very friendly free plan, offering you 50 website lookups/month. If you just need to do the occasional tech lookup for a website, then Wappalyzer is the best tool for you. If you need to do a lot more than you need to sign up for their Pro Plan at $250/month.

#3: SimilarTech – mediocre browser extension, but the best filtering capabilities

SimilarTech is another alternative I tried. If you’re a digital marketer, you probably have tried their flagship tool SimilarWeb, which shows you website traffic for websites.

SimilarTech is very similar to Wappalyzer, in that they have also a free browser extension. When you go to a website like lindy.ai, they’ll tell you all the technologies their website uses, from marketing to conversion to CDNs.

I honestly thought the extension looked pretty ugly, and unintuitive. For example, there wasn’t an easy way for me to scroll down, so some categories were cut off (you can see you can’t go below “Marketing” in the screenshot below). You also had to click through to each category for the technologies to appear.

Aside from their browser extension, SimilarTech also had a web UI, which offers much more filtering capabilities. For example, they allow you to create targeted prospect lists based on companies using specific technologies, with filters for company size, industry, location, and technology adoption patterns as well.

You could theoretically do the same for BuiltWith, but you would have to export the results, and then use a tool like Clay to enrich all the results with firmographic details. With SimilarTech, you skip a step.

Limitations and Pricing

Like Wappalyzer, SimilarTech also lacked data on newer technologies like UnifyGTM, as well as backend technologies that aren’t visible on the website.

SimilarTech is part of the enterprise SimilarTech suite, which means there isn’t a smaller pricing plan that’s suitable for SMBs or smaller teams.

If you need advanced features, you probably need to pay at least $499/month.

• Starter: $249/month – Basic technology detection and limited prospect exports
• Professional: $499/month – Advanced filtering, unlimited exports, priority support
• Enterprise: Custom pricing – API access, custom integrations, dedicated suppor

#4: HG Insights – best for serious enterprise teams and investors

If you need a serious tool that has almost everything, HG Insights is probably for you. HG Insights is probably the Mercedes in this space, as they go way beyond what the other tools in this article provides.

Like Bloomberry, HG Insights also tracks backend software installations and deployments, providing a more complete picture of enterprise tech stacks. For instance, HG Insights tracks product categories such as ERP, CRM, Accounting/Finance and more – all of which aren’t present in BuiltWith.

As you can see in the screenshot above, you can do a bunch of cool filtering, like finding companies that use multiple products ie. (use Tableau AND Jira AND Microsoft Power BI). This could be really useful if you were selling an complex cloud product, and looking for companies that were digitally sophisticated.

In addition to deep search capabilities, HG Insights also offer insights into software spending. For example, you can see how much money a particular company is spending on technology this year, and how it’s been trending over time.

Or you can analyze the adoption trends for a technology like Google Cloud, and see whether companies are spending more or less on Google Cloud over time. Now, I can’t vouch for how accurate or how much “alpha” this data could provide, but if you’re spending millions as an investor, I don’t see why you shouldn’t at least give HG Insights a trial.

Though they’re fairly coy about how they get all this data, I hear they not only do standard crawling, but they also get their data offline, presumably by having deep relationships with executives in the industry?

Limitations and Pricing

Speaking of a trial, HG Insights’ pricing isn’t public, but according to some sources, pricing is as much as $50,000 annually. And they lack a starter plan.

However, there is a way to use HG Insights on an ad hoc basis! If you use Clay, you could pay to enrich only the companies you need in Clay with HG Insight’s technographic data (8 credits per enrichment, last I checked). It’s still rather expensive, but at the same time you don’t have to invest 5 figures annually to use it.

#5: WhatRuns – Simple and Completely Free

On the complete opposite side of the spectrum is WhatRuns, a completely free tool. Like Wappalyzer, WhatRuns offers a basic browser extension that provides instant technology identification. You don’t even need to sign up for an account.

The screenshot above shows what the browser extension looks like. You just go to any website, click on the extension and it’ll show you all the technologies it detected. The layout is fairly similar to Wappalyzer’s, with the technologies segmented by categories like CMS, Javascript libraries, ecommerce etc.

My honest opinion is that you’re definitely going to get what you pay for here – which isn’t a lot unfortunately. WhatRuns is missing *a lot of technologies*. Not even the newer ones, but basic ones too. For instance, when I went to lindy.ai, it was missing technologies like VWO (a very popular CRO product), and Hubspot (one of the biggest marketing tools in the world).

If you just need the most basic tech lookup data, then I could see myself using WhatRuns, but if you’re doing anything even remotely serious, I don’t see why you wouldn’t consider any of the other tools in this article.

Sorry for being brutally honest, WhatRuns developers! I still appreciate you guys offering a free tool to people!

#6: Apps Run The World – best for market researchers

We talked a lot about tools that provide a lot of data on frontend technologies.

Let’s talk about tools that provide data on enterprise tech. One of them is: Apps Run The World. It’s a weird name, I admit, and at first I thought they were a sketchy company, but they’re actually totally legit, and have been around for many many years.

Like Bloomberry and HG Insights, they provide comprehensive data on which companies use specific B2B applications, as well as revenue estimates, and employee counts.

For instance, in the screenshot below you could filter and export companies that use Asana based on their industry, number of employees and more.

If you’re doing market research, you can also clearly see what industries or countries most of Asana customers are in. Which is useful if you want to target their customers, and want to know which particular audience to focus your marketing and sales on.

Limitations

Now the big question: How reliable is Apps Run the World data? Where do they get most of their data?

Apps Run The World seems to get most of their data from job postings, based on what they disclose on their website. Which can be unreliable at times. If a company mentions a particular technology in their job posting, they assume that company is a customer of that technology/vendor. Which in some cases might be wrong.

Just an example to show how inaccurate their data could possibly be: if you checkout their list of Asana customers, they show just 254 customers, which is far short of how many Asana discloses publicly in their quarterly reports.

In terms of pricing, Apps Run The World operates on a subscription-based model with pricing that reflects its enterprise focus. Plans typically start around $995/month for basic access.

#7: NerdyData – best if you’re technically advanced and know what you’re searching for

OK, now for my personal favorite out of all these tools: NerdyData. I first heard of NerdyData when it first launched in Hacker News a decade ago and when I first tried it, I loved how “nerdy” it was (hence the name I guess).

How NerdyData works is you literally just search for any string, or word, and NerdyData goes out and find every single website that has that string in its HTML source.

It’s that simple, which is why I love it. It’s especially useful if you’re looking for something incredibly complex or niche.

As an experiment, since Clearbit is retiring their free Logo API, I decided to try and find all websites that used their free Logo API. I simply searched for ‘logo.clearbit.com’ and NerdyData went out and found 570 sites that had that string in their HTML source. They also showed where in the HTML source they found each string, so you can verify the results yourself. Pretty darn cool and nerdy.

Limitations

Like most of these tools, NerdyData has no coverage of backend technologies. And while I do appreciate how nerdy it is, if you don’t know what to search for, or you just got a technology/product name, there are more user-friendly tools to use.

Pricing

NerdyData’s pricing is relatively reasonable, with plans starting at $200 a month for 5000 rows (websites).

8. CRFT Lookup – Another Free Tool

CRFT Lookup is another free tool that does 1 thing pretty well: Finding the frontend tech stack for a website. Unlike most of the others tool, it doesn’t have a browser extension.

Instead they offer a web interface where you enter in a website, and it generates a free report, telling you what frontend tools the website uses, as well as other misc. info like the meta tags, and sitemap of the site.

When I generated a report for lindy.ai, it showed me most of the frontend technologies it used such as VWO, Microsoft Clarity, and HockeyStack. A nice touch was how they showed a brief description of each technology, so you know what it does, as you can see in the screenshot below. I thought their coverage was really really good, and comprehensive.

They also had a feature where they showed the sitemap visualization of a site. You can see in a very high level how a website’s content is structured. This can be useful for knowing their marketing, the keywords they’re targeting and their overall content strategy. Here’s a screenshot of the sitemap they generated for lindy.ai:

Limitations

Outside of their free tech lookup, they don’t have any feature to actually find companies that use a particular frontend technology, so if that’s what you need, then CRFT isn’t the right tool for you. They also do not have any data on what backend/backoffice technologies a company uses.

Pricing

CRFT though is 100% free and you don’t need to sign up for an account to use it. I didn’t run a bunch of queries, so I’m not completely sure if there are any limits, but they didn’t explicitly say there were any.

9. FUL.IO – Another free tech lookup tool

Ful.io is another tech lookup tool with a free plan, and it’s pretty similar to CRFT. Like CRFT, it doesn’t offer a browser extension. Instead you simply search for a website and it generates a report showing the frontend tech stack for the website.

One thing I did like about Ful.io in particular is that it does goes a bit beyond the basic website tech lookup, and tries to infer the basic backend infrastructure a company uses. For instance, when I searched for lindy.ai, it showed me that Lindy.ai uses SendGrid, and Google Workspace.

In addition, they also showed you what types of special links are in a website, such as whether it has a careers link, or a pricing link, which I though was a nice extra touch.

Ful.io is 100% free to try, and doesn’t even require an account to use. I didn’t encounter any usage limits while I tried it, but there definitely must be one, as I saw pricing plans. However, I don’t know what they are, as it isn’t disclosed anywhere on their website.

Limitations

As far as I know, FUL.io doesn’t have any feature to let you find companies that use a particular frontend technology. They also do not have any data on what backend technologies a company uses.

10. urlscan.io – Perfect for finding technologies that are visible mostly in inner pages of a website

Most of you non-technical peeps will probably ignore this tool, but as a geek, I recently went down a very deep rabbit hole exploring urlscan.io a few months ago.

urlscan.io is like a screenshot archive and X-ray machine for websites combined. Whenever someone submits a web address to urlscan, it visits that page, takes a screenshot, and creates a detailed report showing all the hidden components. Stuff like what tracking codes are running, which third-party services are connected, what technologies power the site, and even suspicious elements.

Because it scans a lot of pages, it knows what scripts are running in many inner pages that BuiltWith probably never crawls. We’re talking checkout pages, app pages after logging in, etc. Scripts that might not be embedded in the homepage of a website but deep in these inner pages.

As an example, when I searched for ‘stripe.com’, it gave me a list of inner pages that had the Stripe javascript embedded, and as you can see some of these aren’t even homepages.

Limitations

URLScan.io is meant for OSINT and security researchers, not sales teams, so it’s not user friendly at all for most purposes. But I thought I’d include it in here in case some of you are really hardcore, and want to explore alternatives that do unique things that BuiltWith doesn’t do.

Which Alternative Should You Choose?

The right choice depends on your specific needs and use case:

• Choose Bloomberry if you need data on non-web technologies and real-time data on companies that purchased or churned from a product
• Choose Wappalyzer if you just need data on front-end technologies, especially if you’re not doing more than 50 website lookups a month.
• Choose SimilarTech if you need advanced filtering such as finding companies that use a frontend technology, and of a particular industry/company size.
• Choose HG Insights if you’re an enterprise organization or investment firm that needs comprehensive spending analytics and strategic intelligence
• Choose WhatRuns if your budget is precisely $0
• Choose Apps Run the World if you’re focused more on market research and tech usage trends.
• Choose NerdyData if you’re technically-adept and know exactly what you’re searching for.
• Choose CRFT Lookup if you’re looking for a free tool to just do front-end technology lookup for a website, and don’t need to actually find leads
• Choose URLScan.io if you’re hardcore 🙂

Once again, if you’re building a competitor to BuiltWith, and want me to try out your tool, feel free to email me with login details and I’ll see if I can include my thoughts in this list.