Wappalyzer tells you what a site uses. TechSpy tells you what it means.
Love the free Wappalyzer extension for a quick glance? Keep it. TechSpy is the upgrade for when the site is a modern SPA, when infra signals matter, or when you need a decision instead of a raw list.
- Sees through React/Next.js SPAs (static HTML + JS-runtime + HTTP headers)
- Adds DNS/DMARC + subdomains Wappalyzer doesn't touch
- Turns detections into an actionable read, not a wall of logos
Scan a domain free — 30 scans/day, no login.
Wappalyzer
- React
- Cloudflare
- Google Analytics
- HubSpot
TechSpy · Verdict / Evidence / Implications
HighClient-rendered React app on Cloudflare, HubSpot-run marketing — a modern GTM stack.
Evidence: Next.js runtime, Cloudflare headers, HubSpot forms. Implications: lead a devtools/RevOps angle.
The React/Next.js blind spot
Wappalyzer's core is HTML-level fingerprinting. On a client-rendered React or Next.js site, the static page ships nearly empty — the real stack loads in JavaScript after paint, so an HTML-only scan sees thin. TechSpy reads three layers at once.
HTML-only · same SPA
- React
- — empty shell —
Detection thins out.
TechSpy · same SPA
- Next.jsJS-runtime
- VercelHeader
- SegmentJS-runtime
- CloudflareHeader
Same SPA, fuller picture — the single most concrete reason a Wappalyzer user upgrades.
Beyond the stack: infra & DNS coverage
Wappalyzer answers what tech. TechSpy also answers what's the operational posture — a category Wappalyzer simply doesn't cover. That's the difference between reading a logo list and reading a company.
Go deeper: Deep Scan + Interact
For the hidden layer — the tools that never show up on a first paint.
Static scan — seconds
The fast glance: static HTML + JS-runtime + headers, returned right away.
Deep Scan / Interact — minutes
- Deep Scan — headless render + HAR capture surfaces hidden APIs and SDKs.
- Interact — an LLM clicks and fills forms to reveal tools that only load after interaction.
Honest note on speed: only the static scan is seconds. Deep Scan and Interact take minutes, because they're actually rendering and driving the page, not reading markup.
Head to head
Wappalyzer earns real checks — extension, community rules, raw speed. TechSpy's edge is SPA depth, infra coverage, and turning it all into a read.
Transparency over a fake 100%
When you're acting on the data — for sales, competitive, or security work — a result that looks complete but isn't is worse than one that tells the truth.
If Cloudflare or anything else blocks the scan, TechSpy says so instead of faking a full result.
Every finding carries a High / Medium / Low signal so you know how hard to lean on it. Integrity over a clean-looking screenshot.
Which one should you use?
No loser framing — some of you should genuinely use Wappalyzer.
Pick Wappalyzer if you want
- A free browser-extension quick glance while you browse
- Its huge community rule set
- A simple, usage-priced detection API
Pick TechSpy if you want
- To scan a modern React/Next.js SPA and actually see the stack
- DNS/DMARC + subdomain + sitemap signals, not just tech
- A decision-ready Verdict/Evidence/Implications read, plus saved scans, compare, and reports
Still glancing at sites all day? Use both — Wappalyzer for the glance, TechSpy when it matters.
Pricing — start free, no login
Free
$0
30 scans/day + DNS / sitemap / subdomains + save & compare
Plus
$19/mo
10 Deep Scan + 5 Interact credits
Max
$49/mo
Unlimited scans + 50 Deep Scan + 25 Interact + Export / Zapier / API
Enterprise
$199/mo
For teams scanning at scale
The static scan runs in seconds. Deep Scan and Interact take minutes — because they render the page for real.
Scan a domain free — no login