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Testing and Issues

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

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


by rating


Slightly sloppy on vertical scrolling with all graphs zoomed out to max time range. Otherwise average to good speed.
iPhone 6 Plus, iOS 12.1
1. Applying filters while the tooltip is show makes the date on the tooltip 1.01.1970
2. No "All" row on stacked bar
iphone6 12.1.4
Applying filters on the percentage chart results into bugged calculation, u can get more than 200% or less than 100%
iphone 6 12.1.4
One little bug with jumps. Everything else is perfect.
Nimble Ant Apr 17, 2019 at 16:31
There is a one-line bug in y axes: values below 1K also has 'K' suffix. Last minute changes - they are so dangerous )
Fair Quokka Apr 27, 2019 at 19:49
— The first graph is slow when scaling.
— The third graph blinks when filtering (the attached video #1).
— The fifth graph has broken percentage (the attached screenshots #2 and #3).
iPhone 6s (iOS 12.0.2); iPhone 5s (iOS 12.1)
Apply filters as well results in incorrect Y values of the points shown on the tooltip on every chart.
1. 1620 -> 1060, 1790 -> 930
2. 406,400 -> 272,400 , 17,670 -> 12,360
iphone 6 12.1.4
Sergey Dikovitsky Apr 17, 2019 at 21:37
View with values shows incorrect dates when change lines visibility state.
iPhone 5s / iOS 12.2
On percentage chart: long tapping buttons in reverse order results in incorrect mini chart display. Long tapping the same button second time updates it but bugs the value. (or vice versa)
iphone 6 12.1.4
What do you use?) Metal, OpenGL, layers or something else?
iPhone 5s
Nimble Ant Apr 17, 2019 at 16:27
I think it is crazy to use Metal/GL for such simple charts. I use standard CAShapeLayers with paths and my app runs smoothly even on iPad 2 from 2011
More fluctuations tooltip
On 6s small lags during scrolling - I'll be back on iPhone 5s 😊
Fast close clicking on change visible - no good animation
IPhone 6s, iOS 12.2
Sometimes, I can’t change tooltip position by click or move.
Sergey Dikovitsky Apr 17, 2019 at 21:35
Y-axis labels overlap on bar chart animations.
iPhone 5s / iOS
Inconsistent theme change durations make parts of the UI blink
iphone 6 12.1.4
Bug with the display of Y value labels lower than 1000, they are shown as Ks as well. Instead of 500 -> 500.00K
iphone 6 12.1.4
Long tapping a filter button on the second chart doesnt hide the respective left-right axes values, although when simply hiding the chart they do get hidden -> inconsistent
iphone 6 12.1.4
Wrong x label positions.
iPhone SE
Y labels are whitened when value selected.
iPhone SE
Bar animations bugged.
iPhone SE
Deleted Account Apr 22, 2019 at 17:30
# All charts
- In night mode the values view should be darker, as it is it blends with the background.
- The top of the values view is clipped (clipped_values_view.jpeg)

# Chart 1
- When trying to view a point, the app just wont let me. The line skips from 14 to 16 March, not allowing me to stop at 15. (skipping_point.MP4) The range selector is at its smallest size in its rightmost potision.
- (line_inaccuracy.jpeg) The 3210 point should be either directly on, or slightly above the 3,2k line, on the screenshot its clearly below.
iPhone SE / iOS 12
Deleted Account Apr 22, 2019 at 17:31
# Chart 2
- Y Values could have been calculated prettier, to avoid "750,7k" and alike.
- Sometimes Y labels are hard to read (unreadable_y.jpeg).
- Point on line goes below x axis (point_below_x.MP4)

# Chart 4
- Highlighing extends to Y labels. Also looks weird when switching night/day modes. (4_highlight.MP4)

# Chart 5
- Line stops not at verticies, but at graph lines (line_stop_5.jpeg)
- Spacing on top of the cell is too big.
maxY on chart has to be on the same position as y-coordinate of the highest y-value by design, wrong minimum
point doesn't go to the minimum during day selection
48 fps during 1st chart scaling on iPhone 6+, 42 fps on iPhone 5S, 30 fps on iPhone 5. For more details read my comments about performance of entry213.
dates are overlapped with each other
wrong font in tooltip
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