Introduction

Verdict Strategy Builder is a desktop app that discovers, stress-tests, and ranks NinjaTrader 8 futures strategies, then exports the survivors as standalone NinjaScript you can compile and trade in NinjaTrader.

You pick the building blocks (indicators, structural patterns) and the constraints (risk, sizing, session rules). A genetic algorithm searches the space of possible strategies, a validation gauntlet tries to break the best candidates, and every survivor lands on a leaderboard with an evidence-backed verdict.

The workflow#

1. Get data — export minute bars from NinjaTrader 8 with the bundled BarsExporter add-on, then import the CSV. No NinjaTrader handy? A bundled sample dataset lets you try everything first.
2. Build — compose a search space on the Build screen: blocks, parameter ranges, optimizer settings, fitness, gates, and the economic world every candidate trades in.
3. Run — the genetic algorithm evolves strategies generation by generation, streaming live progress.
4. Validate — top finalists go through walk-forward analysis, Monte Carlo simulation, and a parameter-stress sweep. Each gets a verdict: Pass, Marginal, or Kill.
5. Export — generate a standalone .cs strategy and install it in NinjaTrader 8.

What the app is — and is not#

• Research and export only. Verdict Strategy Builder never places trades and has no broker connection. You trade the exported strategy in NinjaTrader, on your account, under your control.
• Non-repainting by construction. The building-block palette is 88 stock NinjaTrader 8 indicators plus 9 structural primitives, all evaluated on closed bars with no lookahead. Repainting indicators are excluded so backtest signals match live signals.
• Stock indicators only (for now). Third-party or custom NinjaScript indicators can't be used as building blocks in the current version.
• Not investment advice. A strategy that validated well on history can still fail in the future. Markets change — re-validate and rebuild regularly on fresh data, and always run exports on a simulation account first.

Private by design#

Your imported market data never leaves your machine. Builds, runs, and leaderboard metadata back up privately to your account (a condition of the license) so you can restore on a new device — no other user can ever see your data. See Account & sync.

Where to go next#

• New here? Start with Installation, then the Quickstart — first ranked strategy in about 15 minutes.
• Want to understand the machinery? Read How evolution works and Understanding validation.
• Already running the app day to day? Jump to Operations for licensing, updates, and troubleshooting.