Already Own?

Tracking since May 20, 2026.

Changelog

• May 26, 2026
  description

  Already Own? is a cross-library ownership checker. It scans your Steam and Epic Games libraries and shows a badge on store pages when you're about to buy something you already own.
  
  ── HOW IT WORKS ──
  
  1. Open the popup → Scan tab → click Scan Steam Library or Scan Epic Library.
  2. The extension reads your owned games in the background (no manual steps needed for Steam).
  3. Browse store pages normally. A badge appears above the buy button whenever a match is found.
  
  The badge shows the matched title, source (Steam or Epic), and confidence level:
  • Exact match — normalized titles are identical
  • Title match — one title contains the other (handles subtitles)
  • Likely match — ≥75% word overlap
  
  ── FEATURES ──
  
  • Steam library scan — reads your full game list from your Steam Community profile page (fast, no API limits)
  • Epic library scan — reads your owned games via the Epic Games Store
  • Badges on Steam store pages — shows "You already own this on Epic!" when browsing steam store pages
  • Badges on Epic store pages — shows "You already own this on Steam!" when browsing Epic store pages
  • Fuzzy title matching — handles punctuation differences, trademark symbols, subtitles, regional name variants
  • Manual library — add games the scanner missed
  • Ignore list — dismiss false positives permanently; they're skipped on future scans
  • Export / Import — back up and restore your library as a JSON file
  • 100% local — all data stored on your device, never transmitted anywhere
  
  ── PRIVACY ──
  
  No data leaves your computer. Ever. The extension uses chrome.storage.local to save your game list. It makes API calls to Steam and Epic only during a scan, using your existing browser session — the same requests your browser already makes when you visit those sites.
  
  No accounts, no sign-in, no analytics, no tracking.
  
  ── PERMISSIONS EXPLAINED ──
  
  • storage — save your game library and settings locally in Chrome
  • scripting — inject the ownership badge onto store pages
  • tabs — open a temporary background tab to read your Steam games list (closed immediately after scanning)
  • cookies — read your existing Steam/Epic session to authenticate scan requests; never stored or transmitted

  Never buy the same PC game twice! "Already Own?" is a smart, privacy-first library checker that helps you track your games across different platforms. It scans your libraries in seconds and displays a clear badge on store pages when you are about to buy something you already own elsewhere.
  
  Perfect for gamers who collect free weekly games, buy bundle deals, or simply have a massive digital backlog across multiple stores.
  
  HOW IT WORKS
  
  1. Open the extension popup and go to the "Scan" tab.
  2. Click to scan your libraries (fully automated, no manual typing or API keys required).
  3. Browse PC game stores normally. A badge will appear right above the buy button whenever a match is found.
  
  The badge shows the matched title, where you own it, and the confidence level:
  - Exact match - titles are identical.
  - Title match - one title contains the other (handles subtitles and editions).
  - Likely match - 75%+ word overlap.
  
  KEY FEATURES
  
  - Multi-Store Support - Links your Epic Games and Steam collections to prevent accidental purchases.
  - Smart Fuzzy Matching - Handles punctuation differences, trademark symbols, subtitles, and regional name variants.
  - Fast Background Scan - Reads your game list in seconds using your active browser session (no API keys, no rate limits for Steam profile scan).
  - Configurable Matching - Choose which confidence levels trigger a badge: exact, partial (subtitle variants), or fuzzy.
  - Multi-Language UI - Available in English, Portuguese (Brazil), Spanish (Latin America), Polish, Turkish, and Ukrainian.
  - Manual Library - Easily add any games that the scanner missed.
  - Custom Ignore List - Permanently dismiss false positives; they will be skipped in future scans.
  - Export / Import - Back up and restore your entire library as a local JSON file.
  - 100% Local - Your data never leaves your machine. No servers, no accounts, no tracking.
  
  PRIVACY FIRST
  
  No data leaves your computer. Ever. The extension uses chrome.storage.local to save your game list locally. It communicates with stores only during an active scan, using your existing browser session -- the exact same requests your browser already makes when you visit those websites.
  
  No accounts, no sign-ins, no third-party servers, no analytics, and no tracking.
  
  PERMISSIONS EXPLAINED
  
  - storage: Saves your game library and settings locally in Chrome.
  - scripting: Injects the ownership badge directly onto store pages.
  - tabs: Opens a temporary background tab to read your games list (automatically closed immediately after scanning).
  - cookies: Reads your existing store session to authenticate scan requests; cookies are never stored, saved, or transmitted anywhere.

• May 26, 2026
  host_permissions

  https://store.epicgames.com/*, https://store.steampowered.com/*, https://www.epicgames.com/*, https://graphql.epicgames.com/*, https://launcher-public-service-prod06.ol.epicgames.com/*, https://library-service.live.use1a.on.epicgames.com/*, https://account-public-service-prod.ol.epicgames.com/*, https://catalog-public-service-prod06.ol.epicgames.com/*, https://steamcommunity.com/*, https://api.steampowered.com/*

  https://store.epicgames.com/*, https://store.steampowered.com/*, https://www.epicgames.com/*, https://accounts.epicgames.com/*, https://library-service.live.use1a.on.epicgames.com/*, https://catalog-public-service-prod06.ol.epicgames.com/*, https://steamcommunity.com/*, https://api.steampowered.com/*

Permissions & access

Permissions

storagescriptingtabscookies

Host access

https://store.epicgames.com/*, https://store.steampowered.com/*, https://www.epicgames.com/*, https://accounts.epicgames.com/*, https://library-service.live.use1a.on.epicgames.com/*, https://catalog-public-service-prod06.ol.epicgames.com/*, https://steamcommunity.com/*, https://api.steampowered.com/*

Screenshots