MozCast
Algorithm TrackingWeather report for Google algorithm fluctuations
Overview
MozCast stands as one of the original and most accessible Google algorithm tracking tools, transforming complex SERP volatility data into an intuitive weather forecast interface. Developed by Moz in 2012, it monitors 10,000 carefully selected keywords daily to detect ranking fluctuations that signal algorithm updates. The tool's genius lies in its simplicity — instead of charts and percentages, you get a temperature reading and weather icon that instantly communicate whether Google's rankings are stable or turbulent.
Unlike comprehensive SEO platforms that bundle algorithm tracking with dozens of other features, MozCast does one thing exceptionally well. It focuses exclusively on broad volatility detection using a consistent methodology that's remained largely unchanged since launch. This consistency makes it particularly valuable for historical trend analysis and correlating ranking changes with known algorithm updates over the past decade.
The tool sits alongside Semrush Sensor and Panguin Tool as essential algorithm monitoring resources, but each serves slightly different purposes. MozCast excels at providing quick daily snapshots of overall SERP stability, making it ideal for routine monitoring rather than deep diagnostic work.
Key features
Weather Report Interface
Displays SERP volatility using weather metaphors (sunny, partly cloudy, stormy) making algorithm changes intuitive to understand at a glance.
Temperature Scale
Uses a 0-140°F scale to quantify ranking volatility, with higher temperatures indicating more significant SERP fluctuations.
Feature Tracking
Monitors specific SERP features like featured snippets, local packs, and knowledge panels to identify which elements are experiencing changes.
Historical Data Access
Provides years of historical volatility data allowing you to correlate ranking drops with specific algorithm update periods.
Mobile vs Desktop Split
Tracks volatility separately for mobile and desktop SERPs, revealing device-specific algorithm impacts.
Pricing
| Plan | Price | Includes |
|---|---|---|
| Free | $0 | Daily SERP volatility tracking, weather forecast interface, historical data, mobile and desktop tracking |
FAQ
How accurate is MozCast for detecting Google algorithm updates?
MozCast tracks a static set of 10,000 keywords daily, making it reliable for spotting broad volatility patterns. However, it may miss niche-specific updates that don't affect its keyword set.
What temperature reading indicates a significant algorithm update?
Temperatures above 80°F typically indicate noteworthy volatility, while readings above 100°F suggest major algorithm changes. Normal daily fluctuation usually stays between 60-80°F.
Can MozCast help me understand why my rankings dropped?
MozCast shows when algorithm volatility occurred but doesn't diagnose specific ranking causes. You'll need to combine this data with your own analytics and other SEO tools for root cause analysis.
How often does MozCast update its data?
MozCast updates daily with fresh SERP data, typically posting new volatility readings each morning based on the previous day's search results.
Is MozCast data different from other algorithm trackers?
Yes, MozCast uses a unique keyword set and weather metaphor system. Semrush Sensor and other trackers use different methodologies, so comparing multiple sources gives better perspective.
Review Sentiment
Bottom line
A free option for SEO managers: MozCast offers free daily weather-style visualization of Google SERP volatility. It lacks a review track record, so treat it as experimental.
People love
- +Free daily weather-style visualization of Google SERP volatility
- +Historical data helps correlate traffic changes with algorithm update timing
- +Simple, easy-to-understand metaphor makes algorithm tracking accessible to anyone
Common complaints
- –Weather metaphor oversimplifies the complexity of Google algorithm changes
- –Less granular than Semrush Sensor — no industry-specific volatility breakdowns
- –Updated less frequently and with less detail than competing algorithm trackers
Last updated Feb 2026