Response Time Density — Free Density Heatmap Template
The Response Time Density template visualizes how your API's latency is distributed across response-time buckets, turning a flat log into a clear heatmap of where requests cluster. The sample data spans 50ms to 400ms, peaking around the 100-150ms range (120 and 180 requests) and tapering to just 8 requests at 400ms, so you can instantly see most calls are fast while a thin tail runs slow. It's a ready-made starting point for spotting latency hotspots and outliers without building a density chart from scratch.
Open This Template in the EditorAbout This Density Heatmap Template
The Response Time Density template visualizes how your API's latency is distributed across response-time buckets, turning a flat log into a clear heatmap of where requests cluster. The sample data spans 50ms to 400ms, peaking around the 100-150ms range (120 and 180 requests) and tapering to just 8 requests at 400ms, so you can instantly see most calls are fast while a thin tail runs slow. It's a ready-made starting point for spotting latency hotspots and outliers without building a density chart from scratch.
It's a ready-made Density Heatmap you can open and edit in seconds — replace the sample numbers with your own, restyle it, and download a publication-ready image, all free and in your browser.
Template Data
This template ships with the sample data below. Open it in the editor to swap in your own figures:
| Time (ms) | GET Requests | POST Requests |
|---|---|---|
| 50 | 50 | 20 |
| 100 | 120 | 60 |
| 150 | 180 | 100 |
| 200 | 150 | 140 |
| 250 | 90 | 120 |
| 300 | 45 | 80 |
| 350 | 20 | 50 |
| 400 | 8 | 25 |
When to Use This Template
- Backend and platform engineers profiling API latency to find where most requests land and how long the slow tail really is
- SRE and DevOps teams setting realistic p95/p99 SLOs by seeing the actual shape of response-time distribution
- Engineering leads presenting performance reviews or post-incident reports with a clear heatmap of request density
How to Use It
- Open the template — click "Open This Template in the Editor" to load it with its sample data.
- Edit the data — type your own labels and values, or paste a column straight from a spreadsheet.
- Customize & export — pick colors, add a title, then download as PNG, SVG, or PDF. No signup, no watermark.
Frequently Asked Questions
Can I replace the sample response times with my own API data?
Yes. Click Open in editor and edit the data table directly: swap the response-time buckets (50, 100, 150...) and request counts for your own numbers, add or remove rows, and the density heatmap updates instantly. No signup is required.
Is this template free, and how do I export the final chart?
It's completely free with no account needed. Once you've customized the colors and data in the browser editor, you can export the heatmap as a PNG, SVG, or PDF for reports, dashboards, or slide decks.
More Business & Sales Templates
Ready to use the Response Time Density template?
Open it free — edit the data and export in minutes.
Open in Editor