Download .IPA (2.4 MB)

Testing and Issues

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

Install .ipa files via AltStore

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


by rating


Sloppy when scrolling vertically. Low speed on launch. Very lengthy animations when filtering values in the last chart. Glitches in design implementations.
iPhone 6 Plus, iOS 12.1
Sergey Dikovitsky Apr 18, 2019 at 00:28
Line charts hide some points during range selection. Bar chart animation looks broken.
iPhone 5s / iOS 12.2
It is possible to make the app not animate the line to their positions
iphone 6 12.1.4
Sergey Dikovitsky Apr 18, 2019 at 00:27
Long tap on button does not work.
iPhone 5s / iOS 12.2
Stylish Flamingo Apr 18, 2019 at 11:51
I don't understand. Which button should work with long tap?
Header with date range never updates
iphone 6 12.1.4
Stylish Flamingo Apr 18, 2019 at 11:56
I think, that header should show the full distance, because there are dates on axe x for measuring the distance.
axes on the last chart are not by design
iphone 6 12.1.4
Fair Quokka Apr 27, 2019 at 14:06
— Dates blink and upper bound balues are cut when scaling (the attached video #1). 
— Applying filters to the third graph feels laggy (the attached video #2). 
— Impossible to filter all but one value in the last graph.
— iOS 12+ only.
iPhone 6s, iOS 12.0.2
Switching theme makes the tooltip disappear
iphone 6 12.1.4
Does not support iOS 8. Telegram does.
Stylish Flamingo Apr 23, 2019 at 10:06
Nowhere was it said that the application should support version 8.
Major issue: does not support iOS 10.
Critical issue: does not support iOS 11.
Major issue: line joints change during movement
iPhone X, iOS 12.2
Unwanted animation right after first loading.
iPhone X, iOS 12.2
No separators in cells.
Major issue: During filter toggle the chart which is going to hide/show just hides/shows immediately without animations. Not only the UX is suffering, but also it gives this contestant a major advantage in performance over other participants.
iPhone X, iOS 12.2
Stylish Flamingo Apr 23, 2019 at 10:02
But on the video you sent there is an animation. There is changing the min and max depending on the lines on the graph.
Fonts are completely wrong.
Crazy jumps
iPhone X, iOS 12.2
Vertical and horizontal scrolls do not cancel each other. It's not user-friendly when you select the dates with tooltip
Ugly horizontal lines
iPhone X, iOS 12.2
You can't leave just one item on area chart
iPhone X, iOS 12.2
Stylish Flamingo Apr 23, 2019 at 10:14
One item will always show 100% and will display the graph in one color.
Critical issue: Line joints are always mitter or bevel, even on iPhone X. So, it's not some minor optimization for old devices, rounded joints implementation on Metal require a lot more math to implement, a lot more vertices to calculate and 2-3 times more polygons to draw.
iPhone X, iOS 12.2
Critical issue: This code uses Metal and it will never work on 32-bit devices (including iPhone 5 on iOS 10.3).
Stylish Flamingo Apr 23, 2019 at 09:39
I use Core Graphics
Major issue: It's not so easy to port this code to iOS 8 on iPhone 5S either, because he uses help classes from MetalKit (otherwise he would support iOS 8). And you have to do a lot more work without it.
Critical issue. Here is a screenshot from this app (1st file). And here it is in 400% zoom (2nd file). As you can see, line drawing quality is poor. It is not easy to implement good line quality on bare Metal, MSAA is not enough. Qualitative line drawing requires a lot more calculations and tricks. And such implementations may still be worse in quality than Core Animation / Core Graphics and would definitely affect the performance.
iPhone 5S, iOS 12.2
Nobody added any issues yet...