No. Derby requires real-time data access to function, and therefore it cannot be used without the $149/month base VectorVest Premium RealTime plan.

The $99/month refers only to the Derby add-on, assuming you already have the VectorVest Premium base subscription with real-time data.
The $248/month reflects the complete cost of both required components to actually use the Derby’s functionality. This can create confusion, as pricing for individual components is sometimes listed separately depending on the base level subscription of [...]

To use the RealTime Derby, you need both: Premium RealTime access: $149/month RealTime Derby add-on: $99/month Total Monthly Cost: $248/month
Total Annual Cost (if billed annually): $2,590/year

You must have a VectorVest Premium RealTime subscription, which provides real-time data and platform access. This base plan costs $149/month or $1,495/year. Without this real-time data package, the RealTime Derby tool cannot operate effectively, as it relies on live market conditions to function.

The RealTime Derby add-on itself costs $99/month or $1,095/year if billed annually. However, this add-on requires a base subscription to VectorVest Premium that includes real-time market data in order to function. A subscription for VectorVest Premium is billed at $149/month or $1,495/year if billed annually.