What trading tool should have a free, open-source alternative?
I’m a developer, and I’d like to build a tool around a specific problem people here actually have.
If you currently pay a monthly subscription for a trading tool, which feature do you actually use—and what would you want a free, open-source alternative to do?
It could be a chart indicator, position-sizing tool, options payoff calculator, trade journal, or a way to test clearly defined trading rules.
# Describe:
# 1. What you’re trying to do.
# 2. The inputs and rules the tool would need.
# 3. What a useful result would look like. A concrete example helps.
I’ll start with one request I can realistically finish, publish the complete source, and explain both how to use it and how the underlying concept works—including its assumptions and limitations. I’ll also iterate on it from feedback, free.
**What’s one specific tool you’d actually use if we built it together?**