Send a domain and DomainDNA reads the live homepage, public DNS and the registry's RDAP record, then answers in one JSON: the technologies the site runs (each with the evidence that gave it away), the email provider, the SPF record and its all qualifier, the DMARC policy, registrar, created and expiry dates, domain age, security headers and site files such as robots.txt, sitemap and llms.txt. REST API with OpenAPI, plus a remote MCP server for AI agents.
Who this is for
Sales and marketing teams qualifying leads by the software they use, agencies preparing migration pitches, security and IT teams reviewing vendors, and AI agents asked what a company's site runs on.
What the output looks like
Live calls to /api/email-security, /api/tech and /api/registration, 1 Oct 2026
| Domain | Email provider | DMARC | SPF all | Age | Tech (first 3) |
|---|---|---|---|---|---|
| shopify.com | Google Workspace | reject | softfail | 21.6 y | Shopify, Tailwind CSS |
| hubspot.com | Google Workspace | reject | – | 21.6 y | HubSpot CMS, HubSpot, Cloudflare |
| github.com | Microsoft 365 | quarantine | softfail | 19.0 y | Contentful |
| discord.com | Google Workspace | reject | fail | 25.9 y | Webflow, Google Tag Manager, Google Fonts |
| wordpress.org | Other / self-hosted | reject | fail | 23.5 y | WordPress, Google Tag Manager, Google Fonts |
| zoom.us | Proofpoint | reject | softfail | – | Google Tag Manager, OneTrust |
How to do it
- Type a domain in the Try-it box, or call /api/report?domain=yourlead.com (25 a day free, no key).
- Use /api/tech (3 domains per call), /api/email-security (5) or /api/registration (10) for lists.
- Buy the $5 pack or a plan when you need more; the key appears right after checkout.
From the command line:
curl 'https://domaindna-api.cybermaxtools.com/api/report?domain=stripe.com'
What it costs compared with the alternatives
Published prices, read on each vendor's own pricing page (2026-10-10):
| Tool | Price | Free tier |
|---|---|---|
| DomainDNA API | $5 once for 1,000 domains; $19/month for 5,000 | 25 domain checks a day, no key |
| Wappalyzer | Pro $250/month (5,000 API credits); Business $450/month; Enterprise $850+/month | free account: 50 technology lookups a month |
| BuiltWith | Basic $295/month; Pro $495/month; Team $995/month | free single lookups on the website |
| host.io | Basic $99/month for 10,000 requests (+$10 per extra 1,000); Business $499/month | 1,000 requests a month |
| TheirStack API | $49/month for 1,500 API credits (about 500 companies' tech stacks); $100/month for 5,000 | free trial |
Pricing pages: Wappalyzer, BuiltWith, host.io, TheirStack API.
Why this approach
- Entry at $19/month for 5,000 domains, under Wappalyzer Pro ($250), BuiltWith Basic ($295), host.io Basic ($99) and TheirStack ($49).
- Evidence on every technology (meta tag, header, cookie, script URL or HTML), so you can check why a tool was detected.
- Email provider, SPF and DMARC in the same answer as the tech stack: one call instead of dig, whois and a browser extension.
- Read live when you ask, not from an old crawl; answers are cached for 1 hour per domain.
- A $5 pack of 1,000 domains that never expires, with the key shown right after checkout and no account.
FAQ
Is there a free tech stack lookup API?
Yes. DomainDNA answers 25 domain checks a day per IP with no key and no card.
Why not BuiltWith or Wappalyzer?
They sell crawled history, reverse lookups (every site using a tool) and lead lists from $250 to $295 a month. DomainDNA does not do reverse lookups; it reads the live site, DNS and RDAP for the domains you send, with evidence, from $5.
Why not TheirStack?
TheirStack infers technology from job postings and starts at $49/month for about 500 companies. DomainDNA reads the website itself and adds email security and domain age, from $19/month for 5,000 domains.
What are the limits?
No TLS certificate check (the DomainDNA tool on Apify has it). Bot-walled homepages return blocked: true with a partial stack. A few country domains publish no RDAP, so their age is empty.
Is there a bulk version?
Yes: the DomainDNA tool on Apify takes long lists, adds TLS expiry and a monitor mode, and charges per domain.
Pricing
Free: 25 domain checks a day per IP, no key. Pay as you go: $5 once for 1,000 domains, no expiry. Plans: Scout $19/month for 5,000 domains, Analyst $49/month for 15,000, Platform $99/month for 40,000; yearly $190, $490 or $990.
See DomainDNA API plans and try it free
Published automatically by CyberMax. Every number above comes from the linked public data; nothing is estimated.
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