Is There a Good Charting Library For Iphone

whats a good ios charting library/framework

We've used this in the past
http://code.google.com/p/core-plot/

and found it to be the most reliable!

Is there a good charting library for iPhone?

One of the many factors that motivated the Core Plot project was the lack of good plotting frameworks on the iPhone. Core Plot also encompases many other use cases including desktop systems, but its design has included iPhone support from the beginning. It's getting pretty close to useable and is currently in use in several shipping iPhone and OS X applications.

Edit 2/10

Core Plot has come a long way since I first posted the summary. The framework now has bar charts (including horizontal bar charts, I believe), axis labels (including aribrarty rotations), and fills and backgrounds for graphs. I'm not sure about stacked bar charts, but it wouldn't be hard to add to the CPBarPlot class that implements bar charts. As for annotations, there is a CPAnotation class which you could subclass to add your annotations, if there isn't the exact functionality you need.

Project on github.

Is there any chart library working both on iphone and android applications?

Your best bet is a pure javascript charting library like Flot.

I've seen plenty of flot tutorials for Android, and according to this link flot works fine on iphone except for the mouseover events.

Where can I find an iPhone chart library?

Based on Eiko's link I found threedgraphics as a nice interface for charting.

What is the best Graph and Chart Library available for iPhone and iPad?

Core-plot is an open source library that's been suggested here before.

Is there a good iPhone pie chart library which will produce good look 3d pie charts?

There's also Fusion Charts, which is now HTML5. http://www.fusioncharts.com/

Financial Charts for iPhone application

SciChart have released iOS Stock Charts as part of the SciChart iOS SDK.

Sample Image

SciChart iOS is a paid component and supports:

Extreme performance for realtime charts beating all competitors in tests.
Cross platform to Android, Xamarin, WPF
Multi-pane synchronisation between charts (shares chart events, and zooming)
CategoryDateTimeAxis (collapses weekend / overnight gaps for trading charts)
Many series types to be able to render Candlesticks, OHLC, Mountains, Columns, Bands, Scatter points.
Zooming, panning, scaling out of the box
Axis Textformatting, customisation of axis label and axis frequency output
Cursors, Tooltips
Simple annotations e.g. Line, Text, Axis Marker
Stylish dark theme out of the box!

You can now clone the iOS Chart examples on Github and have a play around with the controls and see how we created the above example app!
Pretty soon we hope to have a demo available on the Apple store too.

Disclosure: I'm the MD of SciChart!

Which library this app using?

My guess is that they're using a customized version of Core Plot.

Update: Check out Is there a good charting library for iPhone? for various iPhone charting implementations.