Home Assistant; Charts: Scroll- Zoom; Development status

By Bernhard published: Sep 15, 2024, 4:54 PM Updated: Sep 9, 2026, 7:54 AM

Something is happening: The long-neglected history in Home Assistant has received numerous improvements. With the 2025.1 release, the charts were given a zoom function, among other things. With the 2025.2 release, the chart library was migrated from chart.js to Apache Echart, as the chart library Chart.js originally used was increasingly reaching its performance limits. ECharts offers extended functionalities and better performance for complex tasks and larger data volumes. With the 2025.10 release, the zoom status is synchronized across all charts if several charts are displayed in the course.

My expectations for the charts, possible future improvements

The majority of users regularly access Home Assistant's history, making it one of the most frequently used features of the platform. I often compare the functionality of Grafana or Plotly Graph with the integrated Home Assistant charts. I miss some details in Home Assistant that other visualizations have already solved. For example, Home Assistant lacks the option to scroll to an older time period. This is currently only possible for the history, the statistics chart cards and the logbook via the date selection, but not directly via the scroll function of the charts.

✓ Chart zoom function

The first pull request for the zoom function is included in release 2025.1. This represents an important step towards modernizing the history. The introduction of Echarts should pave the way for future functions.

✓ Linking Home Assistant charts: Zoom status sync?

The introduction of ECharts went quickly, but new functions are now a long time coming. To change this, I have submitted a feature request. As a first step, I tried to synchronize several charts for the history. There are a few challenges behind the feature, including performance: let's see if I can get the change on the road. I have uploaded a pull request of my first draft to Github.

☐ Zoom using buttons: Rejected.

Alternatively, it would be possible to customize the time range based on the date picker, similar to the forward and back buttons, using own buttons:

With the zoom buttons, the time range can be easily enlarged or reduced, even for several charts at the same time. I submitted the necessary code change in December in a corresponding pull request on GitHub, but this was rejected in February 2025 because a comparable functionality is planned elsewhere. Since I don't want to wait that long, I still have the buttons in use in my Home Assistant instance: https://github.com/home-assistant/frontend/pull/23358 Unfortunately, this has only been announced so far. There are currently no perceptible activities in this direction.

☑ Alternative cards

Plotly Graph
- Advantage: flexible incl. the possibility to visualize historical data
- Disadvantages:
  - Advanced config in YAML
  - No date selection available
  - cannot be called directly from any entity without creating your own dashboard