---
title: "App Window Warning Icon | Free Download PNG & SVG | Ultimate Duotone"
product: "Streamline Icons, Illustrations and Elements"
url: /icons/download/app-window-warning--15853
canonical_url: "https://www.streamlinehq.com/icons/download/app-window-warning--15853"
summary: "Clean duotone icon of a browser window with a warning triangle. Used for app errors and browser alerts."
---

# App Window Warning icon

The App Window Warning icon shows a browser window with three controls and an overlapping warning triangle containing an exclamation mark. Drawn in the duotone style on a 24px grid with a 1px stroke, it uses colored fills and clear outlines for depth at compact UI sizes. Use it for browser errors, application warnings, failed page states, system alerts, and troubleshooting screens. It belongs to Ultimate Duotone set in the Ultimate family.

## Preview

![Clean duotone icon of a browser window with a warning triangle. Used for app errors and browser alerts.](https://assets.streamlinehq.com/image/private/w_240,h_240,ar_1/f_auto/v1/icons/streamline-duotone/coding-apps-websites/apps/app-window-warning-wgg75i12jpdq1s947kdal.png?_a=DATAiZkSZAA0)

## Details

- **Name**: App Window Warning
- **Type**: Icon
- **Set**: [Ultimate Duotone](/icons/streamline-duotone.md) — Ultimate is the world’s largest icon family, designed by 8 expert designers. The Duotone style enhances visual depth by combining colored lines and filled shapes, perfect for matching brand or project colors. Key advantages: 1—Customizable colors. Apply up to four different colors to icon elements. 2— Adjustable stroke thickness. Create looks ranging from thin to bold for varied aesthetics.
- **Family**: [Ultimate](/icons/ultimate-sets.md) — The encyclopedia of icons
- **Style**: Duo, Stroke, Filled
- **Category**: Coding apps websites › Apps
- **Default size**: 24px
- **Stroke width**: 1px
- **Pricing**: Pro
- **License**: [Commercial](https://home.streamlinehq.com/license-premium)
- **Author**: [Streamline](https://home.streamlinehq.com/)
- **Formats**: PNG, WEBP, PDF, SVG, JSX
- **Tags**: app, window, warning, alert, notification, exclamation, caution, error, attention, webpage, interface, layout, browser, page, website, detect, threat, issue, bug, danger

## Download

- [Download App Window Warning on Streamline](https://www.streamlinehq.com/icons/download/app-window-warning--15853)

## Also available in other styles

- [App Window Warning — Ultimate Colors](/icons/download/app-window-warning--19679.md) (Pro)
- [App Window Warning — Ultimate Light](/icons/download/app-window-warning--8350.md) (Pro)
- [App Window Warning — Ultimate Regular](/icons/download/app-window-warning--9081.md) (Pro)
- [App Window Warning — Ultimate Bold](/icons/download/app-window-warning--7619.md) (Pro)

---

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