TheirStack builds the list. TechSpy tells you what's inside one company — and what to do about it.
Two different jobs. TheirStack finds you hundreds of accounts by the tech they run plus who they're hiring. TechSpy takes one of those named accounts and reads it cold: the real stack behind the SPA, DNS/DMARC posture, hidden APIs — turned into a Verdict, the Evidence, and the Implications.
Searching for a TheirStack alternative because you've got the list and now need to go deep on the accounts that matter? That's this.
- Enter a domain, get an actionable read — not a wall of logos
- Free: 30 scans/day, save & compare, no login for the report
Free — no card, 30 scans/day.
One-line verdict: pick the list or pick the read
No spin. These tools win at opposite ends.
| TheirStack | TechSpy | |
|---|---|---|
| Best for | Finding & listing many accounts | Understanding & acting on specific accounts |
| The job | Build targeted prospect lists at scale | Read one domain end-to-end, then move |
| Core signal | Tech used + hiring / job-post intent | Real stack + DNS/infra + hidden APIs → analysis |
| Output | A filtered list of companies | Verdict + Evidence + Implications, per company |
Rule of thumb: building broad lists → TheirStack. Going deep on named targets → TechSpy.
Head to head
TheirStack earns real checks — bulk lists and hiring signals are its home turf. TechSpy's edge is depth on a single domain. Dashes mean not offered, not bad.
| Capability | TechSpy | TheirStack |
|---|---|---|
| Bulk company list-building | — | ✓ |
| Hiring / job-post intent signals | — | ✓ |
| Tech-stack detection | ✓ | ✓ |
| Sees through React/Next.js SPAs | ✓ | — |
| DNS / DMARC / SPF / DKIM audit | ✓ | — |
| Subdomain discovery | ✓ | — |
| Sitemap structure | ✓ | — |
| Deep Scan (headless + HAR, hidden APIs) | ✓ | — |
| Interact (LLM clicks/fills to surface tools) | ✓ | — |
| Verdict + Evidence + Implications output | ✓ | — |
| High / Medium / Low confidence markers | ✓ | — |
| Export PDF / Zapier / API | ✓ | Data / API |
Both are real products. The table is the map, not a scoreboard.
A list of accounts-by-tech is a starting point, not an answer
Filtering to 'companies using Segment that are hiring RevOps' gets a rep to the door. It doesn't tell them what to say when it opens.
TechSpy turns one scan into a decision:
- Verdict — the one-sentence read on what this company actually is, technically
- Evidence — the specific detections behind it, tools grouped by meaning (not an A–Z dump)
- Implications — what it means for your pitch, deal, or audit
- Confidence — every finding tagged High / Medium / Low so you know how hard to lean on it
Same raw detections a list would show you. The difference is TechSpy already did the thinking.
What only TechSpy does
Depth a list platform isn't built for — four capabilities that live at the single-domain level:
See through the SPA — Static HTML + JS-runtime fingerprints + HTTP headers. On a client-rendered React/Next.js site that leaves scrapers a near-empty page, TechSpy still reads the real stack. Why it matters: modern targets stop hiding.
DNS / DMARC / SPF / DKIM audit — Email and DNS posture in one pass. Why it matters: an unprotected domain is a security opener; a locked-down one signals maturity.
Subdomain discovery — Surfaces infra sprawl and new properties. Why it matters: catch expansion before the press release does.
Deep Scan + Interact — Headless render + HAR capture pulls hidden APIs and SDKs; Interact sends an LLM to click and fill forms, surfacing tools that only load after interaction. Why it matters: the stack that never shows on first paint.
Pick TheirStack instead if…
Straight talk — for a real set of jobs, TheirStack is the right tool and TechSpy isn't. It pairs technographics with job-posting/intent data and is genuinely strong at scale.
Choose TheirStack when you need to:
- Build broad prospect lists — hundreds or thousands of companies filtered by tech, at once
- Target on hiring signals — 'companies using X that are hiring for Y'
- Feed a volume outbound motion with fresh technographic + intent data
If that's the job, stop here and go use it. TechSpy starts earning its keep the moment that list narrows to a handful of named accounts you actually have to win.
Pricing — start free, and honest about speed
| Tier | Price | What you get |
|---|---|---|
| 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 |
On speed, plainly: the static scan returns in seconds. Deep Scan and Interact take minutes — they render and drive the page for real, not just read markup.
On integrity: if Cloudflare or anything else blocks a scan, TechSpy says so. No faked 100%.
Stop reading about it — scan one of your real targets
You already know the account. Paste its domain and see the Verdict, Evidence, and Implications for yourself.
- No login. No credit card.
- 30 free scans/day, with save & compare
- Report is email-gated, not login-gated — you're one field away
Scan a domain free
See the opinionated read for yourself — no login, 30 scans/day.