Android WebView (Chromium-based)

• Cache Size: The cache size is managed dynamically by the WebView and is not explicitly documented. It depends on the device's available storage and memory.
• Storage Quota for IndexedDB/LocalStorage:
  • Per-Origin Limit: Approximately 50 MB.
  • Global Limit: Around 10% of the device's free storage.
• Behavior: If the cache exceeds the limit, older resources are evicted automatically.

iOS WebView (WKWebView)

• Cache Size: WKWebView uses the underlying Safari engine, which dynamically manages the cache size. Apple does not provide specific limits, but it is generally smaller than Android.
• Storage Quota for IndexedDB/LocalStorage:
  • Per-Origin Limit: Around 50 MB.
  • Global Limit: Approximately 10% of the device's free storage.
• Behavior: WKWebView aggressively clears cached data when the app is closed or when the system needs to free up space.

Source:

1. Android WebView Cache Limits:

   • Android WebView Documentation
   • Chromium Storage Quota

2. iOS WKWebView Cache Limits:

   • Apple WKWebView Documentation
   • Safari Web Storage Guide

3. Service Workers and Cache API:

   • MDN Web Docs - Service Workers
   • MDN Web Docs - Cache API