See every technology on every page you visit.
TechStacker silently inspects the websites you browse, detects every third-party script, analytics pixel, tag manager, and API endpoint — and gives you a fully searchable, exportable vendor catalog. All in your local browser. No accounts. No servers. No data exfiltration.
An entire competitive intelligence platform. Inside your browser.
Most tech-profilers are SaaS dashboards with rate limits. TechStacker is an extension. Open DevTools-grade telemetry, an IndexedDB-powered catalog, and CSV/webhook export — all without a server.
Real-time Vendor Detection
Every network request, every inline script, every global window object — checked against 4,000+ vendor signatures in <1ms. FIFO-cached regex, sub-millisecond match times.
MV3 webRequest
8-store IndexedDB Engine
Sites, scripts, connections, vendors, custom fields, snapshots, verticals, site-verticals. Yours. Local. Queryable. Never uploaded without explicit opt-in.
Zero data egress
Vendor Lifecycle Tracking
See exactly when a competitor added a CDP, deprecated a chat widget, or swapped payment processors. Vendor changes log with timestamps, per-domain.
Temporal diff
Industry Vertical Classifier
Auto-categorize sites as E-commerce, SaaS, News/Media, Healthcare, Finance, Education, or Government based on the vendors they use. Build your own custom verticals.
v_ecommerce → v_saas…
Tag Pairing & Correlation
Discover: “When GTM-XXXX fires, what loads 100% of the time?” Cross-domain container ID mapping reveals shared corporate ownership and multi-brand networks.
Co-occurrence matrix
CSV / JSON / Webhook Export
Sequential multi-table exports with no memory blowups. Or push a complete JSON snapshot to any REST endpoint, on-demand or auto-fire after every scan.
SQLite pipeline ready
Cloud Definition Sync
Opt into the TechStacker Cloud to receive master vendor library updates via delta sync. New trackers land on your dashboard the day they appear in the wild.
app.tchstkr.com
Headless & Automation
Playwright, Puppeteer, Selenium compatible. Emits a custom console signal when scan completes. Run competitor sweeps across 10,000 URLs in batch.
SCAN_COMPLETE event
Custom Fields & Schemas
Annotate vendors with Contract Expiry, Internal Owner, Compliance Status, Pricing. Build a CRM, not just a list. Schema is yours to define.
User-defined metadata
Privacy-First By Default
Denylist domains, isolate incognito, cap resources per page, no remote calls, no fingerprinting. You decide what stays and what goes.
Granular controls
Pay-With-Data Rewards
Submit an unmapped vendor to the community. If an admin approves it, you earn contribution credits toward metered scans and API usage.
credits, not cash
Incognito-Aware
Per-tab incognito detection. Choose to keep, anonymize, or completely discard telemetry from private sessions. Your call.
noteTabContext()
Install. Browse. Get a database of the modern web.
Three steps. No signup. No email. No credit card.
Add to Chrome
One click from the Chrome Web Store. The extension activates silently — no popups, no onboarding wizard, no required sign-in.
npx techstacker --install
Browse normally
Every page you visit is captured in the background: scripts, XHRs, inline code, global objects, tag managers. Zero perceived lag.
> SCAN_COMPLETE (4 vendors · 8 connections)
Open the dashboard
Click the icon. Search, filter, sort, export, or sync. Your data is in IndexedDB on your machine, queryable like a real database.
SELECT vendor, COUNT(*) GROUP BY vendor ORDER BY 2 DESC;
Eight modules. One inspector. Yours to extend.
The dashboard is a full analytics suite — not a settings page. Inspect, search, correlate, export, and configure from a single dark-themed interface built for power users.
| Vendor | Category | Tracking ID | Status | First Seen | Last Seen |
|---|---|---|---|---|---|
| ECOM Shopify Analytics | Platform | shop.myshopify.com | Present | 2026-04-12 | 2026-08-29 11:24 |
| ECOM Stripe.js | Payment Processor | js.stripe.com/v3 | Present | 2026-04-12 | 2026-08-29 11:24 |
| SAAS Google Tag Manager | Tag Management | GTM-P7Q2X9C | Present | 2026-04-12 | 2026-08-29 11:24 |
| SAAS Segment Analytics | CDP | api.segment.io/v1 | Added 14d ago | 2026-08-15 | 2026-08-29 11:24 |
| SAAS Sentry Browser SDK | Error Tracking | browser.sentry-cdn.com | Present | 2026-04-12 | 2026-08-29 11:24 |
| MEDIA Meta Pixel | Advertising | 3847192038471 | Present | 2026-04-12 | 2026-08-29 11:24 |
| MEDIA Hotjar | Session Recording | static.hotjar.com | Removed 3d ago | 2026-04-12 | 2026-08-26 |
Built for the people who already know what to do with the data.
Competitive Intel Without a Seat
See exactly which tracking pixels, CDPs, and A/B testing tools your competitors use — without paying $30k/yr for a BuiltWith seat.
- Detect new competitor vendors in real time
- Watch when they add or remove a CDP
- Cross-reference GTM container IDs to find sister brands
- Export to CSV for your ABM team
Pre-Debug a Page Before You Even Open It
Want to know if a customer is on Cloudflare Turnstile, reCAPTCHA, or hCaptcha before joining the call? Open the popup.
- Spot the analytics SDK version on a staging URL
- Confirm a customer’s claim “we don’t run Hotjar”
- Find shadow scripts your team forgot about
- Verify tag deployments after a release
Audit Your Own Footprint
Before your DPO asks, know exactly what runs on your own sites. Find rogue pixels, deprecated SDKs, and forgotten chat widgets before they become a GDPR incident.
- Watch vendor additions in real time
- Diff between staging and production stacks
- Enforce deny-lists for hostile endpoints
- Export to feed your compliance SIEM
Find Patterns in the Wild
Browse 200 SaaS landing pages in a week. TechStacker tags and timestamps everything. By Friday you have a dataset: who uses what, who switched from what, who’s on the same vendor.
- Track vertical trends (fintech → Plaid adoption)
- Identify lookalike customers by stack similarity
- Compare against your own tech stack
- Feed results to Notion, Airtable, or a SQLite DB
4,000+ patterns. Updated by the community.
Every vendor in the master library is shipped with category, optional vertical tag, and a tested pattern. New ones are merged every week through the moderated submission queue.
Local by default. Connected when you want it.
TechStacker works forever without an account. But if you opt into the cloud, you get the master library, automatic vendor updates, and a submission queue where you can earn Pro by contributing.
Master Definition Push
Cloud broadcasts new vendor patterns. Your extension delta-syncs only what changed. No full re-download, no bandwidth waste.
definitionsVersion
Moderation Queue
Submit a vendor you spotted. Admins run it through a live regex sandbox. Approve, edit, or reject with feedback — in one click.
app.tchstkr.com/admin
Contribution Credits
Every approved submission awards contribution credits — an internal currency you spend on metered scans and API calls. Community-powered.
credits, not cash
Start free. Scale when you need to.
Free forever for live detection and the inspector. Paid plans add cloud sync, change history, cross-domain intelligence, watchlists, team access, and metered scans.
Free
- ✓ Live vendor detection
- ✓ Inspector dashboard
- ✓ Community vendor catalog
- ✓ CSV / JSON export
- ✓ 100 stored sites · 30-day history
Pro
- ✓ Everything in Free
- ✓ Definition sync
- ✓ Change history (365d)
- ✓ Tracking-ID extraction
- ✓ Custom fields & verticals
- ✓ Unlimited sites & export
Intelligence
- ✓ Everything in Pro
- ✓ Tags & Pairings
- ✓ Cross-domain matching
- ✓ Watchlists & alerts
- ✓ Webhook + auto-sync
- ✓ 5,000 scans / mo
Team
- ✓ Everything in Intelligence
- ✓ 10 seats · shared workspace
- ✓ API access
- ✓ 50,000 scans / mo
- ✓ 100k API calls / mo
Enterprise
- ✓ Everything in Team
- ✓ Unlimited seats & volume
- ✓ SSO
- ✓ Data-warehouse delivery
- ✓ Dedicated support
Frequently asked.
webRequest (read completed requests to identify vendors), storage (the IndexedDB engine), tabs (tab context for per-site scans), and scripting (DOM inspection for inline scripts). Host permissions cover all URLs so the extension can detect vendors on any site. We never write data back or modify page content.chrome://extensions. Even then, you control whether incognito scans are stored, anonymized, or discarded entirely.Stop guessing. Start inspecting.
Add TechStacker to Chrome in 10 seconds. Browse the web with the lights on.