Open Website

Testing and Issues

You can test this app and submit issues during the testing period of the JavaScript Chart contest.

Entries with serious issues will not be able to win the contest, but even minor issues might be important for overall results.


by rating


Fair Quokka May 8, 2019 at 11:54
— Overall performance is below average.
— The graphs are blurry, slow and also blink when scrolling.
— Blinking on vertical scrolling.
— The app is slow when filtering and scaling the third graph.
— Bonus goal is partially implemented, but pie chart is not completed.
— The app is also slow when scrolling the graphs while zoomed. 
Samsung Galaxy J7 (2017), Android 8.1.0; iPhone 5S, iOS 12.1
Deleted Account Apr 17, 2019 at 13:06
unfinished pie chart falls under the background
- App doesn't save scroll position and visibility selection on zoom. After zoom event app reset these values to initial values.

- Zoom to the target date have not good user experience.
1) To get a zoom in the first chart you need to click to the hover line. It's a bit difficult to hit 1px width area.
2) In bars chart, I have not found a way to get zoom to targeting date. You only need to catch up pop-up, during this action target date was changing.

- Pie chart going out of viewport on hover and have an incorrect pop-up.

- App totally not work in IE11 and Edge.
Kingly Chicken Apr 19, 2019 at 13:42
Blurred on retina
Very laggy experience with the pie chart. Especially when zooming in on dates at the beginning or at the end of the chart.
Chrome 73
The values in tooltips are not in comma-separated format.

The work is not the best, to be honest, but still doesn't deserve so many dislikes.
Chrome 73
Charts blurry on retina (no retina support)
MBP 2018 15, Chrome, Mojave
Preview borders is not rounded
Macbook Pro 2018 15, Mojave, Chrome
Preview vertical lines is not white
Macbook Pro 2018 15, Mojave, Chrome
Tooltips don't hide properly
Macbook Pro 2018 15, Mojave, Chrome
No devicePixelRatio support
Macbook Pro 2018 15, Mojave, Chrome
Slim Jaguar Apr 18, 2019 at 19:24
Twitching pie on clicks.
While I drag one handle on scroll bar, the other one is also moving.
Subtle Phoenix Apr 18, 2019 at 19:51
There are lots of lags. Pie chart has no labels
Giant Parrot Apr 21, 2019 at 06:06
1. The Y axes values are not formatted in the short form (e.g. 60M)
2. Some of the chart elements stay in the zoomed in state after a zoom out
3. It's very hard to zoom in on a mouse device.
4. The header zoom in/out transition isn't animated.
MacBook Pro 2015 / Safari 12.1
Stacked: wrong selection on hover
MBP 2018 15, Chrome, Mojave
Bars: can't select top right day
MBP 2018 15, Chrome, Mojave
Stacked: red data not visible; last text on Y axis is cut off
MBP 2018 15, Chrome, Mojave
Stacked: in night mode "All" value should be white
MBP 2018 15, Chrome, Mojave
Large numbers not formatted to human readable format
MBP 2018 15, Chrome, Mojave
2Y: no min value and no horizontal axis (chart hangs in the air)
MBP 2018 15, Chrome, Mojave
Nobody added any issues yet...