TheirStack builds bulk lists. TechSpy reads one company end to end.
TheirStack finds lots of companies by the tech they run and who they're hiring. TechSpy goes the other way: point it at a single domain and get a real read on the stack, the infrastructure, and what it means for how you sell.
- A per-company Verdict, Evidence, and Implications — not a row in a spreadsheet
- Sees through React & Next.js sites that leave ordinary scrapers near-empty
- DNS, DMARC, subdomains, and a Deep Scan that surfaces hidden APIs
Free — no card, 30 scans/day.
TheirStack — the list
TechSpy — the read · acme.io
HighVerdict
Vercel-hosted Next.js app, Segment-fed analytics, Intercom support — a product-led team on managed infra.
Evidence: Next.js runtime + Vercel headers; Segment & GA4 client-side; hidden /api/track via Deep Scan.
Implication: sell to product & growth, not central IT — they adopt drop-in tools.
A list of accounts is a starting point, not an answer
TheirStack hands you hundreds of companies filtered by tech and hiring. Great for building the list. But the moment you need to go deep on a named account and decide what to say, a spreadsheet row runs out of road. TechSpy picks up there.
What a list gives you
acme.io · uses Salesforce, Segment · hiring 3 RevOps
Enough to add it to a sequence. Not enough to know what to open with.
What the read gives you
- VerdictA modern product-led team on managed infra
- EvidenceNext.js/Vercel, Segment, hidden /api/track
- ImplicationsSell to product & growth — a drop-in tool wins
Head to head
Not all checkmarks on our side — bulk lists and hiring signals are TheirStack's home turf, bolded below.
What only TechSpy does
The depth a lead database doesn't reach — turned into an action, not a data dump.
🔎
SPA X-ray
Static HTML, JS-runtime fingerprints, and HTTP headers combine to read React and Next.js sites that return almost nothing to a plain scraper.
🧬
Deep Scan
A headless run with HAR capture surfaces hidden APIs, SDKs, and third-party calls that never appear in the page source. Minutes, not seconds.
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The read
Every scan ends in a Verdict, Evidence, and Implications, confidence-marked — and it says plainly when a site is blocked instead of faking a result.
Pick TheirStack instead if…
Different jobs. Pick the one that matches yours.
Choose TheirStack if you need to
- You're building targeted lead lists at scale — thousands of companies filtered by tech and hiring signals.
- You want job-posting and hiring-intent data to time your outreach.
- Your day is prospecting and list-building, not researching one account at a time.
Choose TechSpy if you need to
- You're researching a specific company and need a real read, not a data row.
- You need the infrastructure picture: DNS, DMARC/SPF/DKIM, and subdomains.
- The target runs a React or Next.js SPA that hides its stack from ordinary scrapers.
- You want hidden APIs and post-interaction tools — starting free at 30 scans a day.
Start free — pay when it becomes a habit
Free
$0
- Scans: 30/day
- Deep Scan: —
- Interact: —
- Export · Zapier · API: —
Plus
$19/mo
- Scans: 30/day
- Deep Scan: 10
- Interact: 5
- Export · Zapier · API: —
Max
$49/mo
- Scans: Unlimited
- Deep Scan: 50
- Interact: 25
- Export · Zapier · API: ✓
Enterprise $199/mo. Static scan runs in seconds; Deep Scan & Interact take minutes.
Got the list? Now read the accounts that matter.
Scan a real target free — no login, 30 scans a day.