Crypto chart replay, free.

What you get

• A visual start-point selector directly on the chart instead of a date field detached from price
• Single-step controls for moving one bar backward or forward without revealing the rest of the move
• Several playback speeds for reviewing slow structure or fast execution sequences
• Random-start practice that prevents choosing only memorable market periods
• Date and time selection when a specific event or setup needs to be reconstructed
• Current-chart or synchronized multi-chart replay, so higher and lower timeframes can advance together
• Indicators recalculated only from candles visible at the replay cursor rather than from the hidden future

Why this is usually paid for

Replay is commonly placed above a subscription boundary because it turns a passive chart into a training product. A live chart can be viewed once; replay can be used repeatedly, measured and made part of a routine, so platforms treat it as a feature traders will return to and pay for.

The computation itself does not require an expensive remote service. Basis already has the candle history and indicator engine in the browser, so replaying a prefix of that history is local work. Keeping it free makes deliberate practice possible without converting a learning tool into another recurring bill.

Replay still has limits that honest practice must respect. Candle history is not a full exchange simulator, a bar does not reveal the exact path price took inside it, and fills are never guaranteed. The useful claim is that replay removes hindsight from chart reading — not that it reproduces every queue and execution detail of a live order book.

How to use it

1. 1

   Choose the market before the outcome

   Open a liquid market and select Replay, then choose a random start or a date you have not studied recently. Starting with a famous rally or crash turns the exercise into a memory test rather than a decision test.

2. 2

   Write the invalidation first

   Mark the level that would make the idea wrong before advancing the next bar. Entry, stop and target recorded before the reveal are evidence; levels invented after the move are storytelling.

3. 3

   Advance at decision speed

   Use single-bar steps around the setup and faster playback only when nothing is changing. Pausing at each decision point produces a useful sample; watching the whole move at speed mostly recreates entertainment.

4. 4

   Review a batch, not one perfect trade

   Repeat the same written rule across dozens of random windows and record every result. Replay becomes research only when losing examples are kept with the winners and the rule is not edited halfway through the sample.

Questions

Also free