CostX is the next-generation option beyond WBS for iPad.
WBS for iPad was released nearly 10 years ago and remains available as a simple, low-cost solution for focused WBS work. It is still one of the best apps in its category for teams that only need core WBS features.
If you need broader coverage, CostX is fully redesigned from the ground up and can replace WBS for iPad while going far beyond WBS alone. Build WBS, CBS, and PBS in one workflow, and use the same project data across iPhone, iPad, and Mac with a consistent experience. If you already use WBS for iPad, you can import your existing WBS files into CostX and continue with mapped fields and attributes.