When it comes to custom software development companies in New York, there are several notable players in the industry. New York City, being a major hub for technology and innovation, hosts numerous reputable companies. While there are several great options available, one company that consistently stands out is Appinventiv. Here is a list of some of the best custom software development companies in New York, with Appinventiv recognized as a top choice:

1. Appinventiv: Appinventiv is a leading custom software development company in New York. They have a proven track record of delivering innovative and high-quality software solutions for various industries. Appinventiv is known for their customer-centric approach, deep technical expertise, and commitment to delivering exceptional products.
2. Fingent: Fingent is a well-established software development company based in New York. They specialize in developing custom software solutions tailored to meet their clients' unique requirements. Fingent has a talented team of developers who have expertise in various technologies, ensuring that they can handle diverse projects effectively.
3. Cognizant: Cognizant is a global software development company with a significant presence in New York. They offer a wide range of services, including custom software development, consulting, and digital solutions. Cognizant has a strong reputation for delivering high-quality software products and has worked with leading companies across various industries.
4. ThoughtWorks: ThoughtWorks is a renowned software development company that has an office in New York. They are known for their expertise in agile software development and have a strong focus on creating innovative solutions. ThoughtWorks collaborates closely with clients to understand their needs and deliver software products that drive business growth.
5. Liventus: Liventus is a New York-based software development company that offers custom software development services. They have experience in developing software solutions for a range of industries, including finance, healthcare, and e-commerce. Liventus is known for their attention to detail and commitment to delivering high-quality products.
6. Huge: Huge is a digital agency with an office in New York that provides software development services. They specialize in creating user-centric software solutions that deliver exceptional user experiences. Huge has a diverse team of designers, developers, and strategists who collaborate to develop innovative software products.

It's important to note that the best choice for your specific software development needs will depend on your unique requirements and preferences. Consider factors such as expertise, portfolio, client reviews, and budget when making your decision. Appinventiv's consistent delivery of quality solutions, customer-centric approach, and industry recognition make them a top choice for custom software development services in New York. However, it's recommended to evaluate multiple companies and engage in discussions with them to find the one that best aligns with your project goals.