Specter

Tracking since Apr 4, 2026.

Changelog

• Jun 12, 2026
  description

  Most websites silently load dozens of third-party scripts the moment you visit them. Ad networks. Behavioral trackers. Session replay tools recording your every click and scroll. Browser fingerprinters collecting your device attributes without asking.
  Specter makes all of it visible.
  What Specter does:
  Specter intercepts every network request your browser makes and classifies it in real time using a locally-running XGBoost ML model — trained on 25,290 real browsing requests with 96.2% accuracy and a weighted F1 of 0.967. No data ever leaves your machine. No server. No proxy. No account required.
  Categories detected:
  — Behavioral trackers
  — Fingerprinting scripts
  — Ad networks
  — Analytics
  — Legitimate third-party
  Features:
  — Live request feed with category badges, confidence scores, and per-request explainability
  — Privacy score (0–100) per site, updated in real time
  — D3.js timeline showing request bursts relative to page load
  — Session history with per-site breakdowns, sortable by date, tracker count, or privacy score
  — Full JSON export or plain-text report copy for any session
  — Optional VirusTotal integration for domain reputation lookups (opt-in, domain names only)
  How it works:
  The ML classifier extracts 27 features per request — URL structure, response size, header patterns, domain reputation, path semantics — and classifies each request in under 50ms. Everything runs locally via ONNX Runtime. A rule-based fallback handles session replay detection and cold-start scenarios.
  Privacy by design:
  Specter does not collect, transmit, or store any data externally. All session data lives in your browser's IndexedDB and is deleted on your schedule.
  Specter is an auditor, not a blocker. It doesn't interfere with your browsing — it just shows you the truth about it.

  Most websites silently load dozens of third-party scripts the moment you open them — behavioral trackers, ad networks, fingerprinting scripts, session replay tools recording your every click. Specter makes all of it visible. And now, stoppable.
  
  **What Specter does:**
  
  Specter intercepts every network request your browser makes and classifies it in real time using a locally-running ML model — trained on 25,290 real browsing requests, 96.2% accuracy. No data ever leaves your machine. No server. No proxy. No account required.
  
  **Detect**
  — Behavioral trackers, fingerprinting scripts, ad networks, analytics, session replay tools (Hotjar, FullStory, LogRocket)
  — Confidence score and per-request explainability for every classification
  — Privacy score (0–100) per site, updated live as you browse
  — Force-directed network graph showing which third-party systems each site connects to
  
  **Block (opt-in)**
  — Adaptive blocking engine acting on classifier output — not a static list
  — Strips tracking parameters (fbclid, gclid, utm_*, and 27 others) from URLs automatically
  — Per-site allow-list so you can restore sites that break
  
  **Defend**
  — Fingerprint defense hooks that add calibrated noise to canvas, WebGL, AudioContext, and navigator APIs before page scripts run
  — Session-scoped randomness — consistent within a session, different across sessions, so sites stay functional
  
  **Analyze**
  — Live request feed with category badges, confidence scores, and URL paths
  — Session history with per-site breakdowns, sortable by date, tracker count, or privacy score
  — Full JSON export or plain-text report for any session
  — Optional VirusTotal domain reputation lookups (opt-in, your API key)
  
  **Privacy by design:**
  Specter does not collect, transmit, or store any data externally. Everything lives in your browser's local storage, deleted on your schedule. The ML model runs entirely on-device using ONNX Runtime.
  
  Open source — github.com/divij404/specter

• Jun 5, 2026
  permissions

  webRequest, storage, unlimitedStorage, tabs, activeTab, alarms

  webRequest, declarativeNetRequest, declarativeNetRequestFeedback, storage, unlimitedStorage, tabs, activeTab, alarms, scripting, webNavigation

Permissions & access

Permissions

webRequestdeclarativeNetRequestdeclarativeNetRequestFeedbackstorageunlimitedStoragetabsactiveTabalarmsscriptingwebNavigation

Host access

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Screenshots