Indicators that never repaint

The short answer

A repainting indicator changes its past values after new bars arrive, so signals that looked perfect in history were never really there. On AlgoBars, a value on a bar never uses a later bar, and the same script on the same data gives the same result every time. Signals you see on closed bars in history are the signals the indicator actually gave. Custom indicators are free and unlimited.

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Last updated September 25, 2026

How to spot repainting

Note a signal on the most recent bars.
Wait for more bars to print.
If the old signal moved or vanished, the indicator repaints.

What AlgoBars guarantees

No look-ahead

A value on a bar never uses a later bar.

Reproducible

Same script, settings and prices, same result.

Honest backtests

Tests only use data known at the time.

Live bar note

The bar that is still forming updates until it closes, as on any platform.

Next steps

No look-ahead backtesting Turn an indicator into a strategy

Frequently asked questions

Do AlgoBars indicators repaint?

No. A value on a closed bar never uses a later bar, so history does not change.

Why do some indicators repaint?

They use future bars, or recalculate past values as new data arrives.