MozCast
MozCast is a free SEO volatility tracker from Moz that visualizes day-to-day changes in Google search results using a weather-style “temperature” score.
Key takeaways
- MozCast is a free, daily snapshot of Google SERP volatility.
- Use it as a signal, not a verdict — always cross-check with your own data.
- High temperature doesn’t automatically mean a confirmed algorithm update.
- Best for trend watching over days or weeks, not single-day analysis.
Think of it as a weather forecast for Google's search results — a quick way to see if the ranking landscape is stormy or calm.
What people use MozCast for
- Monitor Google SERP volatility – See a daily temperature score (higher = more movement).
- Spot potential algorithm updates – A sudden spike may indicate a broad change, but always cross-check with other data.
- Separate site issues from industry-wide shifts – If your rankings drop while MozCast is high, the problem might be global.
- Track historical trends – Compare today’s volatility to recent days or weeks.
- Plan SEO actions – Avoid making major changes during high volatility; wait for stability.
Quick start workflow
- Go to MozCast.
- Note the current temperature and weather icon.
- Compare with the previous day’s reading (shown on the graph).
- If temperature is high (e.g., above 100°F), check your own rankings and Google Search Console for unusual changes.
- Repeat daily to build a sense of normal volatility for your niche.
When not to start here
- Don’t use MozCast as proof of a Google update – It’s a volatility indicator, not a confirmed changelog.
- Don’t assume a spike explains your specific ranking drop – Always investigate your own site data.
- Don’t rely on a single day’s reading – Look at trends over several days.
- Don’t skip other tools – Combine with Google Search Console, rank trackers, and SERP observations.
Alternatives
| Tool | Description | |------|-------------| | Google Trends | Shows search interest over time, not ranking volatility. | | Semrush Sensor | Paid tool that measures SERP volatility with additional metrics. | | Accuranker Algoroo | Free volatility tracker similar to MozCast. | | Rank Tracker | Track your own keyword positions day by day. |
Next step
FAQ
Is MozCast free?
Yes, MozCast is completely free to use.
Does MozCast prove a Google update happened?
No. It shows volatility, which may correlate with updates but is not proof.
How often is MozCast updated?
Daily, reflecting changes from the previous day.
Related topics
Sources
- MozCast / Moz — Primary source for the tool, its methodology, and historical context.
- Search Engine Land — Well-known SEO publication that covered the launch and explains how MozCast works.
- Google Search Central — Authoritative source for understanding Google search systems, updates, and ranking guidance.
Reviewed by Lucía Marín, Founding editor.