Yes, we're going to compare our own tool to the competition. And yes, I'll try to be fair about it. We built Bitverzo because we thought the existing tools were either too expensive, too limited in their free tiers, or too focused on one thing. But every tool has strengths and weaknesses, including ours.
I've used all four of these tools extensively — Bitverzo (obviously), Semrush, SimilarWeb, and BuiltWith. Here's what each one actually does well, what it doesn't, and when you should use which one. No marketing fluff. Just an honest breakdown from someone who's spent way too much time analyzing websites.
Bitverzo: Security + Trust · Semrush: SEO · SimilarWeb: Traffic · BuiltWith: Tech Detection
Each tool has a primary strength:
They overlap in some areas but serve fundamentally different purposes. Let me break each one down.
Full disclosure: this is our tool. I'll try to be objective, but take my praise with appropriate skepticism.
What it does best: Bitverzo gives you a comprehensive picture of a website's trustworthiness and security in one scan. You get a trust score (0-100), technology detection, security header analysis, SSL certificate details, DNS records including SPF and DMARC, domain age, hosting information, and more. All of it is free. No account required. No daily limits.
The data: Our database covers 760,000+ domains. We detect 200+ technologies. We check HTTPS, security headers (CSP, HSTS, X-Frame-Options), email authentication (SPF, DMARC), and combine everything into a single trust score. We've published detailed analyses of WordPress security, HTTPS adoption, email security, and security by country using this data.
Where it shines:
Where it's limited: We don't do SEO analysis (no keyword rankings, backlinks, or search visibility). We don't estimate traffic. We don't track historical technology changes over time. If you need those things, you need a different tool.
Security checks before visiting or buying from unknown sites. Technology scouting on competitors. Quick domain due diligence. Email security audits. Understanding a site's overall trust profile. All free, all instant.
What it does best: Semrush is the industry standard for SEO analysis. Keyword rankings, organic traffic estimates, backlink profiles, site audits, competitive analysis, content gap analysis, and more. If your job involves SEO, you probably already have a Semrush subscription.
The free tier: Here's where Semrush gets complicated. They offer a free account, but it's extremely limited — something like 10 searches per day, limited data in each search, and many features locked behind the paywall. The paid plans start at $139.95/month. That's not cheap for an individual or small business.
Where it shines:
Where it's limited: The free tier is essentially a teaser. You can't do meaningful work without paying. It also doesn't focus on security — you won't get trust scores, security header checks, or email authentication analysis. And it doesn't detect technologies beyond basic CMS identification.
Pricing reality: $139.95 to $499.95 per month. There's a 7-day free trial. The free account exists but doesn't let you do much.
What it does best: SimilarWeb estimates website traffic. Monthly visits, bounce rate, pages per visit, time on site, traffic sources, geographic distribution, referring sites, and audience demographics. It's the go-to tool for understanding how much traffic a website gets and where it comes from.
The free tier: More generous than Semrush's but still limited. You get about 5 results per metric, 1 month of data, and limited geographic breakdowns. Enough to get a general idea, not enough for deep analysis. The paid plans start at around $149/month for individuals.
Where it shines:
Where it's limited: SimilarWeb doesn't analyze security, technology stacks, or trustworthiness. Its estimates can be wildly inaccurate for smaller sites (under 50K monthly visits). The free tier is useful for quick checks but not for serious research.
Accuracy note: SimilarWeb's traffic estimates are exactly that — estimates. For large sites, they're reasonably close. For smaller sites, they can be off by 50% or more. Take the numbers as directional indicators, not gospel.
What it does best: BuiltWith has been doing technology detection longer than almost anyone. They identify what technologies a website uses — CMS, JavaScript frameworks, analytics tools, hosting providers, CDNs, payment processors, email services, and much more. Their historical database is unmatched.
The free tier: BuiltWith's free lookups give you a solid technology profile for individual sites. You can see what technologies a specific site uses without paying. The paid plans (starting at $295/month) add bulk lookups, technology market share reports, lead generation lists, and historical data.
Where it shines:
Where it's limited: BuiltWith doesn't provide trust scores, security analysis, or safety assessments. It doesn't check security headers, SSL configurations, or email authentication. It's purely a technology detection and market intelligence tool. The paid plans are expensive — clearly aimed at enterprise sales and marketing teams.
Semrush starts at $140/month. SimilarWeb at ~$149/month. BuiltWith at $295/month. Only Bitverzo offers comprehensive analysis completely free. If you're an individual or small business, these costs add up fast. Choose the tool that matches your actual needs.
Let's say you want to analyze a competitor's website. Here's what each tool reveals:
Bitverzo tells you: Trust score of 72. Uses React, Cloudflare, GA4, Stripe. HTTPS enabled with valid cert. Missing CSP header. Has SPF but no DMARC. Hosted in the US. Domain is 4 years old. Overall verdict: Likely Safe.
Semrush tells you: 45K monthly organic visits. Ranks for 2,300 keywords. 12K backlinks from 800 domains. Top keywords include "product name" and related terms. Domain authority 42.
SimilarWeb tells you: ~120K total monthly visits. 60% direct traffic, 25% search, 10% social, 5% referral. Average visit duration 2:30. Bounce rate 45%. Top traffic countries: US 60%, UK 15%, Canada 10%.
BuiltWith tells you: Uses React 18.2, Cloudflare CDN, Google Analytics 4, Stripe.js, Intercom, HubSpot, Google Tag Manager, Hotjar, plus 47 other technologies. Server is nginx on Ubuntu. Last technology change detected 2 weeks ago.
See? Different tools, different answers. None of them gives you the full picture alone.
Use Bitverzo when:
Use Semrush when:
Use SimilarWeb when:
Use BuiltWith when:
If I could only use one tool and couldn't use Bitverzo (removing my bias), I'd probably pick Semrush for professional work and BuiltWith for quick technology checks. But since Bitverzo is free and the others cost $140-295/month, the practical answer for most people is: start with Bitverzo for security and tech detection, then use the others if you need SEO or traffic data.
We built Bitverzo to fill a gap. There was no free tool that combined trust scoring, security analysis, technology detection, and DNS checks in one place. Semrush, SimilarWeb, and BuiltWith are excellent at what they do — but what they do is different from what we do, and they cost significantly more.
For the average person who just wants to know "should I trust this website?" — Bitverzo gives you that answer in 10 seconds, for free, without creating an account. That's what we optimized for.
Instant trust scores, technology detection, security analysis, and more for any website.
Analyze Any Website →It depends on your needs. Bitverzo is best for trust scores, security, and technology detection — completely free, no account required. Semrush is best for SEO but costs $140+/month for useful features. SimilarWeb is best for traffic estimates but also paywalled. BuiltWith is great for technology detection with a useful free tier for individual lookups. For comprehensive security and tech analysis at zero cost, Bitverzo offers the most value.
Yes. Bitverzo offers free, instant website analysis including trust scores, technology detection, security header checks, SSL analysis, DNS records, and email authentication status. No account needed. No credit card. No trial period. The full analysis is available for any domain at no cost.
BuiltWith has a longer history and larger historical database for technology detection. Bitverzo detects 200+ technologies and adds trust scoring, security analysis, and email authentication checks that BuiltWith doesn't offer. For current technology detection plus security context, Bitverzo is more comprehensive. For historical data and market share reports, BuiltWith has the edge.
This comparison is based on the free tiers and standard plans of each tool as of July 2026. Features and pricing may change. We've tried to be fair to all competitors while acknowledging that we're obviously biased toward our own product. View technology trends or see the top-rated websites.