In true TradingView spirit, the author of this script has published it open-source, so traders can understand and verify it. Cheers to the author! You may use it for free, but reuse of this code in a publication is governed by House Rules. You can favorite it to use it on a chart.
This is standard script available on Trading View and i have just added ability to add a channel based on standard deviation. In addition to it you can enable/disable optional lines from options and it would add 50% levels of upper and under channel. I added 50% as it provide important price levels if you have right settings selected for channel factor.
Want to use this script on a chart?