> ## Documentation Index
> Fetch the complete documentation index at: https://docs.arguserror.xyz/llms.txt
> Use this file to discover all available pages before exploring further.

# Argus: Error Tracking for Browser, Node.js & React

> Argus automatically captures errors and groups them into issues across your browser, Node.js, and React apps, alerting you before your users notice.

Argus watches your applications around the clock — catching uncaught exceptions and unhandled promise rejections the moment they occur, grouping duplicate crashes into a single issue so you can fix bugs without wading through noise, and alerting you before your users ever file a support ticket.

## What You Can Do with Argus

<CardGroup cols={2}>
  <Card title="Error Tracking" icon="triangle-exclamation" href="/platform/issues">
    Capture every uncaught exception and unhandled rejection across your apps. Argus automatically groups duplicate errors into a single issue so the same bug never floods your inbox.
  </Card>

  <Card title="SDK Support" icon="code" href="/sdks/browser">
    Install a lightweight, zero-dependency SDK for the browser, Node.js, or React in seconds. Every SDK follows the same `init()` API so switching platforms requires minimal changes.
  </Card>

  <Card title="Alerts" icon="bell" href="/platform/alerts">
    Create alert rules that fire the instant a new issue is detected, delivering a notification to your email or a webhook endpoint of your choice.
  </Card>

  <Card title="Performance Monitoring" icon="gauge-high" href="/platform/performance">
    Track transaction durations and web vitals — LCP, CLS, TTFB, and FCP — so you can catch slowdowns before they become user complaints.
  </Card>
</CardGroup>

## Plans and Pricing

Choose the plan that fits your volume. You can start for free and upgrade any time from your billing page.

| Plan | Events / month | Projects  | Price   |
| ---- | -------------- | --------- | ------- |
| Free | 10,000         | 1         | \$0     |
| Pro  | 500,000        | Unlimited | \$10/mo |

<Note>
  When your organization reaches its monthly event limit, the Argus ingest endpoint returns **HTTP 429**. The SDK detects this response and drops the event silently — your application keeps running without any errors or retries. Upgrade to Pro from your billing page to restore ingest immediately.
</Note>

## Start Here

<CardGroup cols={2}>
  <Card title="Quickstart" icon="rocket" href="/quickstart">
    Install the SDK, paste your DSN, and see your first error in the dashboard in under 5 minutes.
  </Card>

  <Card title="Core Concepts" icon="book-open" href="/core-concepts">
    Learn how DSNs, envelopes, issues, fingerprints, and alert rules fit together in Argus.
  </Card>
</CardGroup>