unplus Inc.

See What's Behind
Every Ad

The Chrome extension that reveals the full ad tech stack on any webpage.

Detect ad networks via CSS selectors and SDK introspection. View Prebid.js bids with CPMs, GPT slot targeting, Amazon APS data, and nested iframe hierarchies — without leaving your browser.

Add to Chrome — It's Free

How It Works

Start analyzing ads in three simple steps

Step 1

Activate

Click the AdStackLens icon in your browser toolbar on any webpage.

Step 2

Inspect

Hover over any ad element to instantly see the ad network, size, and serving details.

Step 3

Analyze

Open the detail panel to explore Prebid bids, GPT slot config, targeting key-values, and iframe chains.

Features

Two detection layers, one complete picture

Dual Detection Engine

Two complementary detection layers working together — CSS selector matching finds ad containers on the page, while SDK introspection pulls live data directly from ad tech APIs.

  • ✓ CSS selectors detect AdSense, Ad Manager, Amazon APS, Criteo, and more
  • ✓ SDK layer reads runtime objects like pbjs, googletag, and apstag
  • ✓ Combined results give you the complete picture no single method can

Deep SDK Analysis

Go beyond surface-level detection. AdStackLens reads live data from the three major programmatic SDKs to show you exactly what's happening behind every ad slot.

  • ✓ Prebid.js — bid responses, CPMs, bidder names, ad server targeting
  • ✓ Google Publisher Tag — slot paths, sizes, targeting key-values, out-of-page config
  • ✓ Amazon APS — slot IDs, sizes, and targeting parameters

Interactive Inspect Mode

Hover over any ad element to highlight it and automatically select it in the detail panel, where you can review the full ad stack info — no clicks needed.

Iframe Hierarchy

Visualize nested iframe structures and trace ad serving chains across cross-origin frames in a clear tree view.

Customizable Detection

Add your own CSS selectors to detect custom ad services. Import and export configurations to share across teams.

Size Filtering

Set a minimum size threshold to exclude small ad elements from detection results, keeping your view focused on the ads that matter.

Who It's For

Built for anyone who works with digital advertising

Publishers

Audit your own ad setup to verify that slots are rendering correctly, Prebid auctions are competitive, and no revenue is leaking through misconfiguration.

Ad Operations

Troubleshoot live campaigns by inspecting GPT slot config, targeting key-values, and SDK parameters across any page in seconds.

Competitive Analysis

See exactly which ad networks, header bidding partners, and SDK versions your competitors are running — and benchmark against your own stack.

Sales & Partnerships

Walk into prospect meetings with data — show which ad tech they already use and where your solution fits into their stack.

Pricing

Choose the plan that fits your needs

Free

$0

Try every feature with a monthly domain limit.

  • ✓ 3 domains per month
  • ✓ All features included
  • ✓ No account required
Add to Chrome
Recommended

Pro

$49 /year

Less than $4.10/mo, billed annually. 14-day money-back guarantee.

  • ✓ Unlimited domains
  • ✓ All features included
  • ✓ Cancel anytime
Add to Chrome

Feature Comparison

Feature Free Pro
CSS-based ad detection ✓ ✓
SDK introspection (Prebid, GPT, APS) ✓ ✓
Interactive inspect mode ✓ ✓
Iframe hierarchy visualization ✓ ✓
Custom detection rules ✓ ✓
Size filtering ✓ ✓
Domains per month 3 Unlimited

Frequently Asked Questions

Everything you need to know about AdStackLens

What ad networks does AdStackLens detect?
AdStackLens detects all major ad networks and services including Google AdSense, Google Ad Manager (GPT), Amazon APS, Criteo, and many more via CSS selectors. On top of that, SDK introspection reads live data from Prebid.js, Google Publisher Tag, and Amazon APS. You can also add custom CSS selectors to detect any additional services.
How is this different from browser DevTools?
DevTools shows raw HTML and network requests, but you have to piece together the ad stack yourself. AdStackLens automatically identifies ad elements, reads SDK runtime data (like Prebid bid CPMs and GPT targeting), and presents everything in one organized panel — saving you hours of manual inspection.
Does AdStackLens work on any website?
Yes. AdStackLens runs as a Chrome extension and works on any webpage you visit. It scans the page for ad elements using CSS selectors and reads from ad tech SDKs present on the page. If a site uses ads, AdStackLens can detect them.
What's the difference between the Free and Pro plans?
Both plans include every feature — there are no locked capabilities. The only difference is the domain limit: Free allows 3 domains per month, while Pro gives you unlimited domains for $49/year. Cancel anytime, with a 14-day money-back guarantee on your first purchase.
What happens if I cancel my Pro subscription?
When you cancel, you keep full Pro access until the end of your current billing period. After that, your last installed version of AdStackLens will continue to function indefinitely with all Pro features available at the time of cancellation — you don't lose what you already have. Only the selector database updates and new features released after cancellation will stop being delivered. You can resubscribe at any time to resume receiving updates.
Does AdStackLens collect my browsing data?
No. AdStackLens runs entirely in your browser. All detection and analysis happens locally on your machine. No page content, URLs, or ad data is sent to any external server. See our Privacy Policy for details.
Can I add detection for custom ad services?
Yes. AdStackLens lets you add your own CSS selectors to detect any ad service not covered by the built-in rules. You can also import and export your custom configurations to share them across your team.