– Slick and fast app (+).
– Relative Y-scale isn't perfect (graph #1).
– Data point info disappears by itself after 3 seconds.
– Graph previews could be more detailed.
– Slightly slow when filtering Apples on the last chart zoomed out to the maximum time range.
– Bonus goal is completed (+).

Nice app, but I have a crash every time when zooming the last graph to a pie chart (also on Samsung Galaxy S4, Android 5.0.1).

"+"
1. Very nice performance. One of the slickest.
2. All tasks are completed.
3. Intersect dots are running smoothly on lines during move gestures.
4. Fading edges (easy to do, but nice effect).

"-"
1. Date and other values are changed without animations.
2. Line with respective values is popup is not sorted (from a higher value to lowest)
3. Chart y height wrap logic (bottom edge) is NOT working correctly (stable screenshot without animations).
4. Y Scaled Chart auto height wrap is not working properly.
5. Bar Chart ("Messages" and "Views"). There is a strange gap between drawn chart preview and control area.

1. 100% label on percentage chart tooltip is cut off
2. tooltip in general is way too big

Popup disappears automatically, so I can't fully read the data. It disappears even during "scrolling" which breaks the UI (see video). There is also no way to manually hide the popup.

Performance cheat:
Chart on a preview has a smaller points count than main chart, so it's faster to draw and animate it. In result preview & main chart differs a lot on my opinion (see attachments). In the mockups every point present in the preview.

No able to enable/disable two or more lines simultaneously (see at touch pointer in attached video). This restriction doesn't let me fully test the performance.
Also it's UX issue, because I can't quickly disable several buttons, I need to disable them one by one.

In details mode, chart #3:
- Different data in popup for the same selected bar (see screenshots, first is correct, second is not).
- Selected bar is too far from its x label.
- X labels distribution looks random.
- Date range in title is truncated.

"Point run" animtaion looks nice, but it results in inconsistent data shown in popup vs the point on the line, see screenshot. It is not enough to show the dot on the line (which is trivial), but you may also need to have a "snapping" logic.

No rounded corners on preview. Also may affect perf.

Wrong date:
When trying to open the 7 April 2018 in #2 chart, date range view displays "7 April 2018 - 8 April 2018".
ALSO, you lost three days before 7 April provided by telegram, so actually 7 April should be at center of 168hour timeline.

Y-scale on line graphs doesn't start with lowest visible value

Why do you use custom binaries and not json files as data sources, isn't it a performance cheating?

Not round values on Y axis

Sometime tooltip in pie not opened (after second touch no popup with details)

Range selector changes without animation. I know that there was no direct requirement about this, but anyway. I'm pointing to this as attention to detail, because it's not a chart transition, which was allowed to do in any way.

Wrong red bar size (in a tooltip it's a 0, but it present in a stack)

Dates on X-axis located not under the corresponding lines.

No label position animation.
No points sliding on the lines on label position change.
In zoomed view slider are "not glued" to days.
And, as I can see, incorrect mask (must #80242F3E, seems like simple saturation decrement) for inactive areas for bar's in dark theme.

Вообще работает круто, особенно "Area",  очень шустро.
Я как только не извращался, рисовал Path только там где
нужно, остальное drawPoints, всё равно подтупляет. Не представляю как можно сделать
быстрее))

One of the slickest app because of the smallest charts. One of criteria is usability, that means large chart areas.

if you zoom in 4th chart on the most left dates, they have incomplete series

Nice app, you are in my 'vote up' list. Vote up mine, if it's good enough

Preview chart has less data than main chart.

There are two issues with scrolling:
1. Sometimes chart can not be scrolled
2. When scrolling, tooltip always occurs.

Wrong tooltip position. If it is possible, it should be under selected point.

Wrong filter button colours in both themes.