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


No retina support (blurry on retina screen)
All devices with pixelRatio > 1
Fair Quokka May 8, 2019 at 11:59
— Overall performance is below average.
— Vertical scrolling doesn't work unless you aim outside the graphs.
— The app is slow when filtering graphs #1, #2, #3 and #5.
— Long tap doesn't work when other filters are applied.
Samsung Galaxy J7 (2017), Android 8.1.0; iPhone 5S, iOS 12.1
Circles don't hide, if column is disabled.
Laptop / Chrome 73.0.3683.103 (Official Build) (64-bit) / Windows 10
Lucky Falcon Apr 17, 2019 at 18:36
I noticed after sending to the contest, but it was too late :)
Thanks for the feedback.
Last x axis lines are attached to the last element on chart.
I understand, that it is made for smooth animation, like was on video in stage #1, and, to be honest, your animations and submission itself is very smooth, good job!
However, such things could confuse users.

I also agree with "Merry Ant". Use window.devicePixelRatio at the next time.
Laptop / Chrome 73.0.3683.103 (Official Build) (64-bit) / Windows 10
Long tap doesn’t work second time.
Lucky Falcon Apr 19, 2019 at 22:55
A repeated long press does not activate all the buttons - it is contrary to the conditions of contest.
It turns off the buttons all the time and the second time for the third time.
Thanks for feedback.
Pavel Vlasov Apr 19, 2019 at 22:56
1) Chart 1: right click on the preview area (two fingers touch), "Esc" to hide context menu, move mouse. The sliding window start resizing - that's unexpected. 2) Almost the same for the main chart area.
Chrome, macOS
- The bottom value on the Y axes is changed with no transition
- The tooltip text animations are performed in the same direction, no matter which direction the tooltip is moved
MacBook Pro 2015 / Safari 12.1
Lucky Falcon Apr 22, 2019 at 13:43
Thank you for your report.
- Yes it's true
- Not sure what the organizers was such a requirement. The video shows that the rotation is only in one direction.
Nice work! But something wrong with y-axis labels on stacked bar chart.
Iphone SE
Percentage: no need for "%" sign on Y axis
MBP 2018 15, Chrome, Mojave
Line charts: circle cut off on top and bottom
MBP 2018 15, Chrome, Mojave
Line charts: preview not start from min value
MBP 2018 15, Chrome, Mojave
Stacked: red data not visible
MBP 2018 15, Chrome, Mojave
Nobody added any issues yet...