How SeaText AI Handles Browser Local Storage Quota Limits

SeaText AI is a client-side marketing agent. It rewrites landing pages, translates copy, and personalizes offers based on traffic source. To keep that work fast, the script can store an ID in browser local storage. Storage is useful, but browsers decide how much space each site gets. If a local storage write fails, SeaText AI does not stop. It catches the error and falls back to an in-memory cache for the current session.

What SeaText AI stores in browser local storage

The Seatext SPA guide says one thing clearly: the script stores an ID in local storage. It does not say that SeaText stores full page copies, images, or customer data. The ID helps the script keep its work consistent. You must allow local storage access so the script can read and write that ID.

Local storage is per origin. An ID saved on one domain is not available on another. This is normal browser behavior. If your SPA talks to multiple domains, the script may need to work across origins. The Seatext docs warn to check for cross-origin issues.

Local storage is synchronous. It is available right after the page loads. It also persists after the browser closes, unless the user clears it. That is why a small ID can make the script feel smoother on return visits.

Every origin has a storage limit. The exact limit depends on the browser and device. Do not rely on a specific number. If an origin reaches its limit, a write throws QuotaExceededError. That error is the signal SeaText AI watches for.

The table below summarizes what the reviewed documentation says.

How the fallback works

When a local storage write fails, SeaText AI catches QuotaExceededError and logs a warning to the console. It then switches to an in-memory cache. The cache keeps core functions alive for the rest of the page session.

An in-memory cache lives in JavaScript memory. It is fast. It is also temporary. If the page reloads or the tab closes, the cache is gone. Local storage would have survived that moment; memory does not.

What still works during the fallback? The parts of SeaText that rewrite content, translate copy, detect bots, and generate variants do not depend on the local storage ID for their core output. Seatext's site says the platform rewrites pages, translates into 125 languages, and detects bot clicks. Those features run after the page loads. The local storage ID is an input, not the whole system.

One nuance for SPAs: a route change is not a full page reload. An in-memory cache can survive a client-side route change. A hard refresh or a new tab starts a new page session.

How to diagnose the fallback: a four-step sequence

Use this sequence when you suspect SeaText has fallen back.

1. Observe fallback signals. Open DevTools and reload the page. Look for a QuotaExceededError and any warning from the script. The console shows the source file that threw the error.
2. Reproduce the quota error. Use a test profile. Fill local storage until a write throws. A controlled loop can add test keys one by one. Once you see the exception, reload the page with SeaText active.
3. Listen for documented fallback events. SeaText may dispatch a custom event when the fallback activates. The exact event name is not documented in the materials reviewed here. Check with the vendor for the exact event name. If the event exists, use it to record when the fallback happens.
4. Request persistent storage with user consent. Use the browser Storage API when supported. Call navigator.storage.persist() from a user gesture such as a click or a consent choice. The browser decides whether to grant the request. This does not force a larger quota.

Example for step 4:

if (navigator.storage && navigator.storage.persist) {
  const granted = await navigator.storage.persist();
  console.log('Persistent storage granted:', granted);
}

Persistent storage can reduce the chance that the browser evicts your data. It does not override a full or blocked local storage. Check with the vendor if your target browser does not support the API.

When local storage quota limits actually matter

Most pages will never fill the local storage quota because an ID is small. The problem is more likely when something else uses the same origin's storage. Large offline files, user-generated content, analytics caches, or another script can consume the quota.

Enterprise browsers may block local storage entirely for security reasons. If that happens, the script cannot write the ID. The fallback will activate on the first attempt.

Cross-origin SPA setups add another scenario. If the main page is on one domain and the script is loaded from another, the browser may treat storage as unavailable. The Seatext SPA guide calls this out. Make sure the script and application share the storage context or the fallback will be more frequent.

Users can also block storage in browser settings. That is their choice. Site owners should not fight it. The fallback exists to keep the page working.

What fallback means for SPA integration

Seatext's SPA guide gives three practical instructions: add the snippet where the app initializes, load it asynchronously, and verify local storage permissions. Here is how they connect to quota behavior.

First, the snippet loads asynchronously. That keeps page performance steady. It also means the script may initialize after React or Vue mounts. If the app has already written a lot to local storage, SeaText's write may be the one that triggers the quota error.

Second, check the entry point. In React, that is often index.html or main.jsx. In Vue, it is main.js. In Angular, it is main.ts or index.html. Add the snippet in the body or the equivalent initialization section.

Third, open DevTools after the build. Check the console and network tabs for errors. If the script fails to load, you will see a missing resource. If it loads but local storage is blocked, you will see storage-related errors.

Some developers clear all local storage in their app. That is not always safe. If your app removes the ID SeaText needs, the script will write it again or fall back. Check with the vendor before deleting unknown keys.

What you can and cannot do about quota limits

You cannot force a browser to give a larger quota. No script can. You also cannot override a user setting that blocks local storage.

You can reduce your own storage use. Delete old local storage keys from your app. Store only small values. Avoid storing media or long logs in local storage.

You can request persistent storage with user consent. The browser Storage API includes navigator.storage.persist(). Call it after a user takes a clear action. The browser may show a permission prompt or grant silent permission.

You can monitor the fallback. Use the diagnostic sequence to confirm when it happens. Send an analytics event when a documented fallback event fires. That gives you a real number instead of a guess.

Persistent storage is useful but not magic. It changes eviction priority, not the hard quota. If the origin is full, the write can still fail. If the user blocks storage, the API cannot help.

Frequently asked questions

1. Can SeaText AI increase the local storage quota?
   No. A client script cannot change the browser's quota rules. If you need more reliable storage, request persistent storage with user consent through navigator.storage.persist() when supported.
2. What does SeaText AI actually store?
   The SPA guide says the script stores an ID in local storage. It does not list page content, customer records, or long-term caches. Keep local storage permissions enabled for the script.
3. How do I know when the fallback is active?
   Start with the diagnostic sequence. Look for QuotaExceededError in the console, reproduce the error in a test profile, listen for a documented fallback event, and request persistent storage if needed.
4. Does the fallback stop personalization or translation?
   No. SeaText AI can still rewrite and translate content while the fallback is active. What changes is persistence. The in-memory cache will not survive a full page reload.
5. Does this matter for React, Vue, or Angular?
   Yes. SPAs often have one entry point and use client-side routing. Make sure the SeaText snippet is in that entry point and local storage is allowed. A route change may not clear memory, but a full reload will.
6. Can I test the fallback safely?
   Yes. Use a test profile. Fill local storage until a write throws, then reload the page. Watch the console. Do not test this on a live customer site.

Further reading

These sources provide additional context. Their inclusion is not an endorsement.

• Seatext SPA integration guide
• MDN: Storage quotas and eviction criteria
• MDN: Navigator storage API