6. Bar Replay

Bar replay reveals history one bar at a time, so you can study how price developed as if you were watching it live. It is ideal for practicing reads and reviewing setups without hindsight.

Starting a replay

Select Start replay in the toolbar. The toolbar shows Select start bar, and each pane shows Select replay start. Hover a candle to preview the replay marker, then click that candle. Replay starts paused at the selected time, keeps earlier candles visible for context, and withholds candles after the cursor. As soon as the start bar is selected, every pane fits all of its available replay bars into view, so nothing is hidden off-screen to the left or right.

Before replay begins, every visible pane is topped up with up to 1,000 bars of history before the start bar — counted in bars, not calendar days — so indicators that need a long warm-up (moving averages, ATR, Pine scripts with lookback requirements) have their full pre-calculation window at the very first replayed bar. This applies to the pane you clicked as well as any other pane, whatever its timeframe.

If you change your mind before selecting a bar, choose Cancel replay (X).

Playback controls

• Play / pause — toggle automatic playback (keyboard: Space).
• Step — advance one bar at a time.
• Speed — choose the playback rate:

How multi-pane replay stays in sync

Replay drives all panes from a single time cursor. The timeline is built from the fastest timeframe among your panes, and slower panes are aggregated from that finer data as the cursor advances — so a 1H pane and a 5M pane stay consistent on the same replayed moment. Bars at or before the cursor are shown; bars after it are withheld.

Replay and other tools

Replay pairs naturally with Backtesting: replay builds intuition by hand, while the strategy tester evaluates rules systematically over the same history.

Paper trading works inside replay too: each session gets its own demo account, named Replay <ticker> · <start time>, which is archived when you leave replay, so practice trades on history never mix with the live paper account. Orders fill from the replayed bars and are stamped on the replay clock. See Paper Trading in Replay.

Next steps

Layer in the events that moved price.

Next: Event & Session Overlays