BuiltWith vs SimilarTech: Honest Comparison (2026)
You're about to spend $200-$995/month on a tool that tells you what technology a website runs. That's real money. Choosing between BuiltWith and SimilarTech comes down to database size, traffic intelligence, and price - but pick the wrong one and you're paying for data you can't actually use in your outbound workflow.
30-Second Verdict
- Pick BuiltWith if you need the largest database (414M domains) and historical data going back over four decades. Entry price: $295/mo.
- Pick SimilarTech if you want technology detection plus traffic estimates at a lower starting price ($200/mo) and you're already in the Similarweb ecosystem.
- Skip both if your real bottleneck is getting verified emails and phone numbers for the companies on your list. That's a contact data problem, not a technographic one.
What Each Tool Does
BuiltWith
BuiltWith has been the default technographic tool since 2007. It indexes 414M domains across 113,000+ technologies, updated weekly. You can find every company running Shopify, Marketo, or whatever technology your product replaces, then export that list for outbound.
Individual site lookups are free forever. Paid plans unlock bulk list building, filtering, and export. BuiltWith also offers eCommerce-focused retail reports and product/website lists, which is useful if you sell into online retail.
SimilarTech
SimilarTech operates as a Similarweb company. It combines technology detection with traffic estimates, so you can prioritize prospects by both tech fit and site size - something BuiltWith simply doesn't do.
Their coverage spans 100M+ websites and 20M+ companies, with 10 years of historical data. SimilarTech also supports alerts when companies change technologies, which creates a strong trigger for timely outreach.
Pricing Breakdown
BuiltWith Plans
| Basic | Pro | Team | |
|---|---|---|---|
| Monthly | $295 | $495 | $995 |
| Annual | $2,950 | $4,950 | $9,950 |
| Tech filters | 2 | Unlimited | Unlimited |
| Upload analysis | 2,000 domains/mo | 20,000 domains/mo | Unlimited |
| API credits | - | - | 100,000/month |
| Logins | 1 | 1 | Unlimited |
BuiltWith also offers an Advanced plan at $144/year for individual detailed site lookups - a solid middle ground between the free tier and the $295/mo Basic plan.
SimilarTech Plans
| Basic | Ultimate | |
|---|---|---|
| Monthly | $200 | $490 |
| Tech filters | 2 Technology Reports | Unlimited |
| Export | Included | Included |
Enterprise pricing on both tools requires a sales conversation. Older SimilarTech structures also listed Startup ($290/month), Professional ($12,000/year), and Premium ($36,000/year) tiers.
Here's the thing: BuiltWith Basic at $295/mo only lets you filter by two technologies. If you need to cross-reference multiple stacks, you're looking at Pro ($495/mo) minimum. SimilarTech's jump to unlimited at $490/mo is slightly cheaper than BuiltWith Pro, and that gap compounds over a year.
Feature-by-Feature Comparison
| Feature | BuiltWith | SimilarTech | Edge |
|---|---|---|---|
| Database size | 414M domains | 100M+ websites | BuiltWith |
| Data freshness | Weekly updates | Tech-change alerts | BuiltWith |
| Traffic data | No | Yes | SimilarTech |
| Tech change alerts | Churn reporting | Real-time alerts | SimilarTech |
| Historical depth | 41 years | 10 years | BuiltWith |
| CRM integration | Available | Salesforce (Enterprise) | BuiltWith |
| Browser extension | Yes | Yes | Tie |
BuiltWith wins on raw database size - about 4x more domains indexed. SimilarTech wins on traffic intelligence. If you need both technology detection and traffic estimates in one place, SimilarTech handles that natively.
BuiltWith and SimilarTech tell you what tech a company runs. Prospeo tells you who to call. Upload any domain list and get back verified emails (98% accuracy) and direct dials from 300M+ profiles - with 30+ filters including technographics powered by Wappalyzer and live job postings.
Stop paying $500/month for lists you can't actually prospect into.
Data Accuracy
Neither tool publishes a clear, third-party accuracy benchmark. Industry-wide, technographic detection runs roughly 80-90% accurate for common, frontend-visible technologies like analytics scripts, CDNs, and eCommerce platforms. Accuracy drops sharply for backend stacks and anything companies actively obfuscate.
We've found that cross-checking with a free browser extension like Wappalyzer often catches gaps in both tools, especially for JavaScript frameworks and newer technologies that crawlers miss. Plan for some manual cleanup if you're exporting large lists too - BuiltWith users frequently call out messy CSV exports in their G2 reviews.
What Real Users Say
BuiltWith carries a 4.3/5 on G2 from 62 reviews. Users consistently praise the depth of technology insights and list-building capabilities. The recurring complaint: exports are messy. One reviewer titled their feedback "Great for Tech Stack Insights, but Hard to Work with at Scale," noting that large CSV exports need significant manual cleanup before they're usable.
SimilarTech sits at 4.2/5 on G2 from just 12 reviews. Users like the traffic-plus-technology combination, but data completeness is a concern - one reviewer noted the tool "often does not capture all the necessary information on the lead's website." The review volume gap (62 vs 12) tells its own story about market adoption.
On Reddit, we've seen threads where people discuss buying $500 worth of access for a single month to speed up an eCommerce prospecting sprint, then canceling. Honestly, that's how we'd recommend most small teams approach these tools.
When to Pick Which
BuiltWith wins for massive list building across 414M domains, eCommerce-focused retail reports, and long-range historical trend analysis. If you're building lists of 10,000+ companies using a specific technology, BuiltWith's scale is hard to beat.
SimilarTech wins for traffic-layered prospecting where you need to prioritize by website size, a lower entry price ($200 vs $295/mo), and teams already using Similarweb's broader suite.
Neither wins for getting actual contact data from your technographic lists. Both tools output domains and company names. Neither gives you the emails, phone numbers, or people you need to reach.
Let's be honest: most teams don't need a permanent technographic subscription. Buy one month, build your lists, cancel, and spend the ongoing budget on tools that help you actually reach those companies.
Turning Domains into Contacts
This is the workflow gap that trips up most teams comparing BuiltWith vs SimilarTech. You spend $300-$500/month building a list of companies running your competitor's technology, then you're stuck manually hunting for contact info. Both tools stop at the company level.
If you're trying to operationalize this for outbound, it helps to think in terms of lead vs prospect vs opportunity and where technographics actually fit in your funnel.
The free tier gives you 75 emails per month. Enough to test the workflow before committing anything.
If deliverability is a concern, run your list through cold email verification before you scale.
Your BuiltWith or SimilarTech export is a CSV of domains. Prospeo's enrichment API matches 83% of those companies to verified contacts - returning 50+ data points per lead at $0.01/email. No manual hunting. No bounced emails torching your domain.
Upload your technographic list and get verified emails back in minutes.
FAQ
Is SimilarTech owned by Similarweb?
Yes. SimilarTech operates as a Similarweb company, which is why it can pair technology detection with traffic estimates across 100M+ websites.
Can I use BuiltWith for free?
Individual site lookups are free forever on BuiltWith.com. Paid plans $295-$995/mo unlock bulk list building, technology filtering, and exports. The $144/year Advanced plan sits between free and Basic.
How do I get contact data from a technographic list?
Neither BuiltWith nor SimilarTech provides emails or phone numbers. Export your domain list as a CSV, then run it through a contact enrichment platform to get verified emails and direct dials. That two-step workflow - technographic targeting plus enrichment - is how most outbound teams actually operationalize this data.
Do I need a year-long subscription to either tool?
No. Many teams buy a single month, build all the technographic lists they need, then cancel. A one-month sprint at $295 (BuiltWith Basic) or $200 (SimilarTech Basic) is far more cost-effective than a $3,500-$6,000 annual commitment for most small and mid-market teams.