# Settings and storage

AvComp stores settings and session data locally in the browser.

## <mark style="color:$warning;">Settings</mark>

Common app preferences include:

* Theme: auto, light, or dark.
* Font scale: small, medium, or large.
* Airline profile selection.

Some feature-specific settings are stored inside each tool, such as aircraft presets in Alt Calc or weather airport lists.

## <mark style="color:$warning;">Local storage</mark>

AvComp uses browser local storage for app data. This keeps normal use private to the device, but it also means the data is tied to that browser profile.

Examples of locally stored data include:

* Loaded OFP session.
* Alt Calc session and aircraft presets.
* ATC clearance data.
* Weather airport list.
* Logbook entries and profile.
* Theme and font scale.

## <mark style="color:$warning;">Clearing data</mark>

Clearing browser site data can remove AvComp sessions and saved records. Use tool-specific clear buttons when you only want to clear a single active session.

## <mark style="color:$warning;">Offline cache</mark>

When installed or reopened after a successful online visit, AvComp may load from its offline app cache. Live services, such as weather, still require a network connection.

## <mark style="color:$warning;">Backups</mark>

For important records, use the available export features. Local browser storage should not be treated as the only long-term archive.


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```

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Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.