Build your own indicators with NexuScript.

Getting started

1. Open the Scripts panel and press New. Pick Blank or one of the examples.
2. Change the script, then press Run. The indicator goes on the chart, and every chart that already uses it updates. Run does not save.
3. Press Save to keep the script. It stays in the indicator list under My scripts, and the last 10 saved versions are under Versions.
4. Press Reference to look anything up. It opens beside the editor on the name under your cursor (put the cursor on ta.ema and press it), and you can search by name or by a few words such as moving average or session. Every keyword, value and function is there with its settings, what it gives back, what happens with missing values, and an example you can paste. The same reference is the Syntax tab of the docs page.

While you type, the editor colours the script and numbers its lines. A line with a mistake has its number in red: point at the number to read the problem. When a script fails to run, the status line under the editor gives the line and column, for example line 7:15: closee is not defined; did you mean close?.

The settings a script declares with input appear in the indicator's settings, like those of any built-in indicator.

A first script

nexscript 1

indicator "RSI with levels", short = "RSI"

input length = 14, title = "Length", min = 1, max = 500
input src = close, title = "Source"

level "Overbought", 70, color = color.red
level "Oversold", 30, color = color.green

on bar
    let rsi = ta.rsi(src, length)
    plot("RSI", rsi, color = rsi >= 70 ? color.red : color.blue, width = 2)
    if rsi >= 70
        background(color.fade(color.red, 90))
    end
end

Everything before on bar is the setup: it runs once. The on bar ... end block runs once for every bar, oldest first, and again for the newest bar each time its price changes.