IconVault's Storage Quota playground measures what browsers actually give you. The live panel reads the real navigator.storage.estimate() for usage and quota, and five hands-on experiments fill localStorage, sessionStorage, and IndexedDB with test data until the browser throws, so you see the true ceilings instead of guessing from documentation. It is free and runs fully in your browser.

Every experiment writes clearly labeled test keys you can remove with one click, and the usage bar updates as you go. You will also learn when the browser may evict your data and how navigator.storage.persist() protects it. Perfect for planning offline-first apps, caches, and large client-side datasets.