Cross-Platform Utility App Development

I'm looking for an experienced app developer to create a simple utility/tool app that can be used on IOS mobile devices as well as desktop computers.

Key Requirements:
- App needs to be used on mobile devices, and desktop computers.
- The app should be functional, user-friendly, and intuitive.
- Clean and modern UI/UX design is essential.
- Must include essential features as specified in the detailed project proposal.

Ideal Skills and Experience:
- Proven experience in developing cross-platform apps.
- Strong knowledge of both iOS and Android development frameworks.
- Expertise in UI/UX design.

Please include detailed project proposals in your application.