If you’re looking for a Flutter app development company in California, USA, there are many options available. Here are a few companies you might consider:

  1. Savvy Apps: Savvy Apps is a well-known app development company with experience in developing Flutter apps. They’re based in Reston, Virginia, but work with clients from all over the world.
  2. Mind inventory: Mind inventory is a software development company based in California that specializes in developing mobile apps using Flutter. They have a team of experienced developers who can help bring your app idea to life.
  3. Quytech: Quytech is a mobile app development company with a presence in the USA, India, and UK. They have experience in developing Flutter apps for a range of industries, including healthcare, finance, and e-commerce.
  4. Zaza: Zaza is a California-based app development company that offers Flutter app development services. They’ve worked with clients from startups to large corporations, and can help with every step of the app development process.
  5. Conscious Technologies: Conscious Technologies is a software development company with a focus on mobile app development. They offer Flutter app development services and have experience in developing apps for both iOS and Android.

These are just a few of the many companies that offer Flutter app development services in California. Be sure to do your research and choose a company that has experience developing apps similar to yours and that you feel comfortable working with.