Uptime Monitor Tool

Uptime Monitor Tool

Uptime Checker

Purpose of the Tool

The Uptime Monitor Tool is designed to help website owners, administrators, and developers track the availability and performance of their websites or web services. It provides real-time monitoring and historical data to help identify patterns of downtime, performance issues, and overall reliability.

Key purposes include:

  • Ensuring website availability for visitors and customers
  • Identifying unexpected downtime quickly
  • Tracking performance metrics over time
  • Providing data for SLA (Service Level Agreement) compliance
  • Helping diagnose intermittent connectivity issues

Real-world Examples

E-commerce Website: An online store uses uptime monitoring to ensure their site is always available, as even minutes of downtime can result in significant revenue loss.

API Service Provider: A company offering API services monitors uptime to maintain their 99.9% SLA and provide credits to customers when thresholds aren't met.

IT Department: Corporate IT teams monitor internal applications to proactively address issues before employees report them.

Web Hosting Company: Hosting providers use uptime data to demonstrate reliability to potential customers and identify server issues.

Formulas/Algorithms

The tool uses several key calculations:

Uptime Percentage

Uptime % = (Number of successful checks / Total number of checks) × 100

Mean Time Between Failures (MTBF)

MTBF = Total uptime duration / Number of failures

Mean Time To Repair (MTTR)

MTTR = Total downtime duration / Number of failures

Status Check Algorithm

The tool performs HTTP HEAD requests to check status (faster than GET requests). A successful response (HTTP status 200-399) is considered "up".

Response Time Calculation

Response time is measured from the moment the request is sent until the first byte of the response is received.

Privacy Note

This Uptime Monitor Tool operates with the following privacy considerations:

  • All monitoring checks are performed directly from your browser - no website data is sent to any external server
  • Your monitoring history is stored locally in your browser's storage and is not collected by any third party
  • The tool does not store or log the content of any website, only availability status and response times
  • You can clear all monitoring data at any time by clearing your browser's local storage
  • This tool does not use cookies for tracking purposes

Note that when monitoring websites, your IP address will be visible to the target website (as with any web request).

FAQ Section

How accurate is this uptime monitor?

The accuracy depends on your network connection and the check interval. For most purposes, it provides a good indication of website availability, but for mission-critical monitoring, consider a dedicated monitoring service with multiple check locations.

Why does the tool show my site as down when I can access it?

This could happen due to several reasons: your local network might have issues, the site might be blocking HEAD requests, or there might be regional availability differences. Try checking from a different network or device.

Can I monitor multiple websites at once?

The current implementation monitors one website at a time. To monitor multiple sites, you would need to open multiple instances of the tool or implement a more advanced version.

How long is the monitoring data stored?

The data is stored in your browser's local storage and will persist until you clear it manually or until the storage limit is reached (typically several MBs).

Can I get alerts when my site goes down?

This basic version doesn't include alerting functionality. You would need to implement server-side code or use a dedicated monitoring service for email/SMS alerts.

Why use HEAD requests instead of GET?

HEAD requests are more efficient as they don't download the entire page content, just the headers. This reduces bandwidth usage and provides faster status checks.