Website tech stack API compared: DomainDNA API vs Wappalyzer, BuiltWith and TheirStack
Which tech stack API is cheapest for checking a list of websites?
For checking up to a few thousand domains a month, DomainDNA API costs less: 25 free checks a day, then $19 a month for 5,000, with the evidence for each technology plus email provider, SPF and DMARC. Wappalyzer, BuiltWith and TheirStack start at $49 to $295 a month but add lead lists, history and much larger technology coverage.
DomainDNA API: Any website's tech stack and email security, one call
from $5Tech stack with the evidence for each technology (header, script or DNS record)
Secure checkout · 14-day fix-or-refund if it doesn't work as described (terms)How we compared
- Published entry price and what it includes
- Free tier
- What one lookup returns
- Lead lists and history
Tech stack API features side by side
| What buyers compare | DomainDNA API (CyberMax) | Wappalyzer | BuiltWith | TheirStack |
|---|---|---|---|---|
| Entry paid plan | $19/month: 5,000 domain checks | $250/month (5,000 API credits) | $295/month | $49/month for 1,500 API credits |
| Free tier | 25 checks a day, no signup | Limited free plan | Free single lookups on its website | Sign-up credits |
| Email provider, SPF, DMARC | Yes, in every lookup | Not its focus | Not its focus | Not its focus |
| Lead lists by technology | No | Yes | Yes | Yes (companies by technology and jobs) |
| AI agent access | MCP server + REST | API | API | API |
Sources: DomainDNA API (our live page) · Wappalyzer (checked 2026-11-15) · BuiltWith (checked 2026-11-15) · TheirStack (checked 2026-11-15).
Tech stack API pricing
| Option | Published price | Notes | Source |
|---|---|---|---|
| DomainDNA API (CyberMax) | from $5 | Tech stack with the evidence for each technology (header, script or DNS record); Email provider (Google Workspace, Microsoft 365, Proofpoint and more), SPF and DMARC policy; Domain age, registrar and expiry from RDAP; security headers | Our page |
| Wappalyzer (Pro plan) | $250/month (5,000 API credits) | Pick it if you build lead lists of sites that use one technology and need CRM enrichment | Their page |
| BuiltWith (Basic plan) | $295/month | Pick it if you need historical technology data and market-share reports | Their page |
| TheirStack API | $49/month for 1,500 API credits | Pick it if you want company technographics inferred from job posts | Their page |
Rival prices as shown on each seller's own page (Apify Actors: Apify's public pricing API), checked 2026-11-15. Prices change; check the seller's page before buying. Options whose price we could not confirm on that day are left out.
Where Wappalyzer, BuiltWith and TheirStack are better
- Wappalyzer (Pro plan): Lead lists by technology, CRM enrichment and a far larger technology catalogue.
- BuiltWith (Basic plan): Years of technology history per site, market-share reports and very large lead lists.
- TheirStack API: Infers what companies use from job postings, so it covers internal tools a website never shows.
Which website technology API should you pick?
Choose DomainDNA API if
- you check hundreds or a few thousand domains a month and want a low monthly price
- you need email security (SPF, DMARC, mail provider) next to the tech stack
- an AI agent should call it through MCP
Choose Wappalyzer if
- you build lead lists of sites that use one technology and need CRM enrichment
Choose BuiltWith if
- you need historical technology data and market-share reports
Choose TheirStack if
- you want company technographics inferred from job posts
What DomainDNA API includes
- Tech stack with the evidence for each technology (header, script or DNS record)
- Email provider (Google Workspace, Microsoft 365, Proofpoint and more), SPF and DMARC policy
- Domain age, registrar and expiry from RDAP; security headers
- REST API and an MCP server for AI agents; one call per domain
- Free: 25 domain checks a day, no signup; $5 pay-as-you-go pack; Scout $19/month for 5,000
Tech stack API questions
Which tech stack API is cheapest for checking a list of websites?
For checking up to a few thousand domains a month, DomainDNA API costs less: 25 free checks a day, then $19 a month for 5,000, with the evidence for each technology plus email provider, SPF and DMARC. Wappalyzer, BuiltWith and TheirStack start at $49 to $295 a month but add lead lists, history and much larger technology coverage.
Is there a free tech stack API?
DomainDNA API answers 25 domain checks a day free with no key or signup. Wappalyzer has a limited free plan and BuiltWith shows single lookups free on its website; check each page for current limits.
How do I check what technology a website uses?
Send the domain to a tech stack API (or paste it into a lookup page). DomainDNA API returns each technology with the evidence it found, such as a script URL, header or DNS record.
Is DomainDNA a BuiltWith alternative?
For per-domain lookups, yes, at a much lower price. For historical data, market share and big lead lists, BuiltWith does more.
Can an AI agent use it?
Yes. The same key works on the REST API and the remote MCP server, so Claude, ChatGPT and other MCP clients can call it as a tool.
DomainDNA API: Any website's tech stack and email security, one call
from $5Any website's tech stack and email security, one call
Secure checkout · 14-day fix-or-refund if it doesn't work as described (terms)Free how-tos
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