Cost-effective strategies for mobile app development include using cross-platform frameworks like React Native, cheap internet and cable package focusing on MVP (Minimum Viable Product) to prioritize essential features, outsourcing development to skilled teams, and leveraging open-source tools. Efficient project management and regular testing also help reduce costs while ensuring high-quality app performance and user experience.

The efficient project management in the article above requires regular testing, which is also important in reducing costs, similar to how geometry dash scratch players need to practice and have a strategy to achieve higher scores in each level.