Decide under trading-oriented constraints
Because you cannot go back, you stay focused on what to look at and how to decide from the information available at that moment, rather than redoing a decision after seeing what came next.
Plans
Chart Playback is a practice tool for replaying historical charts one bar at a time, repeatedly making trading decisions, and reviewing those decisions later.
Guest and Free are available now. Pro is still being prepared for public release and cannot currently be purchased.
Guest and Free are currently available. The Pro column describes the planned features after public release; Pro is not currently available or open for purchase.
| Feature | Guest | Free member | Pro (pre-release) |
|---|---|---|---|
| Core practice | |||
| Chart replay / orders / drawing | Available | Available | Available |
| Practice with real price data | Not available | Available | Available |
| Forward-only Serious Practice | Not available | Not available | Available |
| Review and viewing | |||
| Review standard practice on charts | Available | Available | Available |
| Review Serious Practice on charts | Not available | Not available | Available |
| Export AI-analysis logs | Not available | Not available | Available |
| Standard charts in separate windows | Not available | Not available | Available |
| Review charts in separate windows | Not available | Not available | Available |
| Data and account | |||
| Saved CSV limit | Not available | Up to 10 | Up to 100 |
| Account management | Not available | Available | Available |
| Browser-data backup / restore | Not available | Available | Available |
The Pro column describes the planned initial public offering and is not available yet.
How Pro changes practice
Pro adds forward-only Serious Practice, where you decide from only the information visible at that point and preserve the decision for later review. It adds trading-oriented constraints and deeper review so decision patterns and points to revisit can feed into your next practice session.

Because you cannot go back, you stay focused on what to look at and how to decide from the information available at that moment, rather than redoing a decision after seeing what came next.
Review recorded decisions and practice trades with the chart after the session ends. This makes it easier to see how you decided in different situations and identify points to revisit in the next practice session.
Open daily, weekly, and monthly views in separate windows and revisit the same situation from multiple perspectives, making context that is easy to miss on a single timeframe easier to examine.
Export a Serious Practice record as an AI-analysis log and provide it to an external AI service yourself. Use it as material for organizing decision patterns and review points that may be harder to notice on your own.
Pro also increases the saved CSV limit from 10 instruments with Free to 100. CSV files and practice data still remain in the browser you are currently using; cloud storage, cross-device sync, and direct AI-provider integration are not included in the initial Pro offering.
¥980/month (tax included)
This is the planned price for Japan. Pro is still in pre-release preparation and cannot currently be purchased.
After public release, Pro signup will be available from Account in the Chart Playback web app after signing in. Sign-in and payment will not take place on this official website.
Pro is still in pre-release preparation, so the production web app does not currently offer Pro signup.
Open the web appChart Playback does not provide investment advice, trading recommendations, trading signals, forecasts of future price movements, or guarantees of profits. Practice orders are not sent to a brokerage.
Chart Playback Data Tool is a separate tool, not a Pro feature. It does not require a Chart Playback account or sign-in.
View Data ToolAvailable now
Try fictional sample instruments without signing in, or use a free-member account when you want to practice with CSV price data you prepare.
Open Chart Playback