The app is fully the same as ChebyshevTrendPro but based on Yahoo Finance free data feeds only. GoogleFinance intraday data feeds, which provide realtime data for NASDAQ & NYSE executed symbols and for Bombay Stock Exchange, National Stock Exchange of India, Shanghai Stock Exchange, Shenzhen Stock Exchange listed symbols against Yahoo 15-20 minutes delay, not available in that version. YTrend uses Chebyshev polynomials to create trend lines against Yahoo Finance (intraday/daily/weekly/monthly) stock charts. The innovative trending method is based on creating polynomials using a modified Gaussian least squares fit that essentially acts as a noise filter, removing random fluctuations from the chart data and finds the real underlying trend. The main benefit of using this trending method is an almost complete absense of lag, when compared to moving average trends. Chebyshev Trend Pro includes buy/sell signals. An unique method has developed specially for app to provide these signals. Trends can also be compared with classical MA, Bollinger Bands, Parabolic SAR & volume indicators, MACD, Chaykin, BB%B, slow stochastics, RSI, CCI & ADX oscillators and more (check v.2 manual appendix #2 at the support site for more details). Other features include the ability to save stock symbols in a portfolio by groups of interest and adjust the trend dates, moved crosshair & Fibonacci retracement. You can try Chebyshev's trend, a free version of the app, to test before making a decision to purchase YTrend. As stock data is sourced from the Yahoo Finance website, only stocks available on the website can be trended in the app. A data connection is required to access the Yahoo Finance website, however the app will perform best if a WiFi internet connection is available. If you are interested in charting against realtime data for NASDAQ & NYSE executed symbols and for Bombay Stock Exchange, National Stock Exchange of India, Shanghai Stock Exchange, Shenzhen Stock Exchange listed symbols check ChebyshevTrendPro app please.