Comparing purpose-built AdTech supply-side intelligence with general web technology profiling. Updated 2026.
| Feature | Red Volcano | BuiltWith |
|---|---|---|
| Primary Focus | Supply-side AdTech intelligence | General web technology detection |
| Publisher Coverage | 32M+ publisher websites | Tracks technologies across the web |
| Data Refresh | Weekly crawls | Varies; some data refreshed monthly or less |
| ads.txt Data | Full parsing and monitoring | Basic detection only |
| sellers.json Data | Complete indexing | Not available |
| Technology Depth | 2,000+ ad technologies with deep categorization | Broad technology detection across all categories |
| Header Bidding | Prebid.js partner-level detection | Basic Prebid detection |
| App Coverage | App ads.txt and SDK detection | Limited mobile SDK data |
| CTV Coverage | CTV app advertising data | Not available |
| Ideal User | SSPs, ad networks, supply-side teams | Sales teams, lead gen, general tech research |
BuiltWith is the go-to platform for broad web technology profiling. It detects technologies across every category -- CMS, analytics, hosting, e-commerce, frameworks, and advertising. If you need to know how many websites use Shopify or WordPress, BuiltWith excels.
Red Volcano goes deeper in the advertising technology vertical. While it tracks 2,000+ ad technologies, the real differentiator is the depth: not just detecting that a publisher uses Prebid.js, but identifying every bidder adapter configured, every SSP listed in their ads.txt, and how their monetization stack has changed over time. Red Volcano treats AdTech as a first-class data domain, not one of many technology categories.
Red Volcano crawls, parses, and monitors ads.txt files from 32M+ publishers weekly. You can search by seller account ID, track additions and removals, validate supply chain authorization, and cross-reference with sellers.json data from SSPs. This supply chain intelligence is fundamental to how modern programmatic advertising works.
BuiltWith may detect the presence of an ads.txt file, but it does not parse the contents, track changes, or provide the supply chain mapping capabilities that AdTech professionals need. For general technology profiling, this is not a limitation; for supply-side intelligence, it is a critical gap.
See how Red Volcano's supply-side data compares. 32M+ publishers, weekly updates, full ads.txt intelligence.
Book a Demo →Red Volcano's weekly crawl cycle means you see new SSP relationships, header bidding changes, and ads.txt updates within days. In the dynamic AdTech ecosystem, where publishers frequently add and remove demand partners, this freshness matters for operational decisions.
BuiltWith's refresh cycle varies by technology category and plan tier. For general technology research and lead generation, its cadence is typically adequate. For time-sensitive AdTech intelligence, it may lag behind.
Red Volcano is used by SSPs to find new publishers, by ad networks to identify monetization opportunities, and by supply-side teams to analyze the competitive landscape. Its data drives operational decisions in the programmatic supply chain.
BuiltWith is widely used by sales teams for lead generation (finding companies using specific technologies), by investors for market sizing, and by developers for technology trend research. Its broad coverage makes it valuable across many industries, not just advertising.
Not exactly. Red Volcano replaces BuiltWith for AdTech-specific use cases, offering much deeper advertising technology intelligence. For general web technology profiling outside of advertising, BuiltWith remains the broader tool.
BuiltWith can detect the presence of ads.txt but does not parse its contents, track changes over time, or provide supply chain mapping. Red Volcano provides full ads.txt parsing and monitoring for 32M+ publishers.
Red Volcano is specifically built for this use case. Its filters for SSP relationships, header bidding configuration, ads.txt entries, and traffic allow supply-side teams to find and qualify publishers precisely.
Red Volcano focuses on advertising and monetization technologies (2,000+ tracked). For CMS, e-commerce platforms, analytics tools, or other non-advertising technologies, BuiltWith has broader coverage.
Yes. Some organizations use Red Volcano for deep AdTech intelligence and BuiltWith for broader technology research and sales prospecting. The platforms serve different primary use cases.
32M+ publishers. 2,000+ ad technologies. Weekly updates. ads.txt and sellers.json depth. Purpose-built for SSPs, ad networks, and the programmatic supply chain.