Sure! Here are some popular app development services:

1. Native App Development: Building apps specifically for a particular operating system, such as iOS or Android.
2. Hybrid App Development: Developing apps that can run on multiple platforms using a single codebase.
3. Web App Development: Designing and developing applications that run on web browsers across various devices.
4. UI/UX Design: Creating intuitive and visually appealing app interfaces for a seamless user experience.
5. Backend Development: Building the server-side infrastructure and functionality that powers an app.
6. Testing and Quality Assurance: Conducting thorough testing to ensure the app functions correctly and meets user expectations.
7. Maintenance and Support: Providing ongoing support and making updates to ensure the app remains functional and secure.
8. App Store Optimization (ASO): Optimizing app listings to increase visibility and downloads in app stores.
9. Consultation and Strategy: Collaborating with clients to define their app goals, target audience, and overall app strategy.
10. AR/VR App Development: Developing applications that leverage augmented reality (AR) or virtual reality (VR) technologies.

Note: The specific services offered by app development companies may vary. It's best to inquire with individual companies to learn about their specific offerings.