interappdevelopment.com

What It Is

Interapp Development is an independent software consulting and development company founded in 2005, with nearly 20 years of experience in web application development. The company focuses on custom software solutions for specific industries, with core strengths in deep .NET expertise and modernization of legacy systems.

Core Analysis

• Features and Use Cases: Offers custom development, system integration (QuickBooks, NetSuite, ADP, etc.), legacy system modernization (migrating from Classic ASP to modern architectures), and AI-enhanced development. Its flagship product LymeStack provides application templates and scaffolding tools, while SimpleAuth is an open-source .NET authentication project.
• Supported Languages/Frameworks: The backend is primarily Microsoft-based (.NET 9 Web API); the frontend supports Angular as the main framework, as well as React and Vue; databases use SQL Server; desktop development supports Swift and WPF.
• Integrations and Ecosystem: Deep integration with finance and payroll systems, with support for mapping services such as ArcGIS and Google Maps.
• Open Source and Self-Hosting: The overall business is closed-source commercial consulting, but SimpleAuth is open source. On-premises deployment options are supported for enterprises that need to operate outside the cloud.

Pricing

The website does not publish specific pricing. This is a typical B2B custom development service, so you need to contact the company for a quote.

Pros and Cons

Pros: 20 years of experience across the evolution of .NET, making it especially strong in legacy system modernization; an independent consulting model enables direct and personalized development collaboration; deep industry focus in areas such as insurance, agriculture, logistics, and government brings strong business-domain understanding.
Cons: The technology stack is heavily tied to the Microsoft ecosystem, which may not suit non-.NET teams; pricing is not transparent; as a small independent consultancy, it may face resource constraints when delivering multiple very large projects concurrently.

Who It’s For

Mid-sized to large North American organizations with legacy .NET/ASP systems that urgently need modernization, or organizations in specific sectors such as commercial insurance, agriculture, and government that require custom systems plus finance/payroll integrations.

Access from China

Unknown. The official domain (iadev.net) is an overseas corporate site, with no information about a mainland China CDN. Sites of this kind are usually directly accessible, but this has not been tested and is therefore marked as unknown.