Application software development
Internal business systems, customer-facing web services and multi-tenant SaaS. The work ranges from moving a spreadsheet-and-paper process onto a screen to AI search that runs entirely on your own servers.
Let's get started!
From an ideato software that runs.
Addsoft is a software development partner that handles planning, development and operation in one place — from internal business systems to mobile apps and games.
- Founded
- 2020
- Core practice areas
- 4
- Primary stack
- .NET · Unity
- End-to-end delivery
- Plan → Operate
About
We start small and see it through
Addsoft is a software company founded in 2020 in Icheon, Korea. Requirements, design, development, deployment and operation all stay in the same hands, so nothing gets lost in translation. We are small on purpose — and we finish what we take on.
Services
What we can build
Business systems and SaaS, mobile apps and games, commerce and logistics, and in-house AI. Hand us the whole thing or just the part you need.
Mobile app & game development
Mobile games in Unity and apps built on web technology — including field apps that need phone features like NFC and push notifications — through store submission and post-launch updates.
E-commerce & logistics
Not just listing products and taking orders — making orders, settlement, delivery and warehouse stock actually fit together.
Technical consulting & maintenance
We also take on systems that are already running — reading code nobody handed over, and getting it back to a state you can change safely. That includes large jobs like moving a live service to a new database.
Works
Things we have built
Business systems we delivered, enterprise solutions we helped build, and services, games and developer tools we plan and run ourselves.
Client project2026
After-service management system
A B2B system where headquarters, distributors and service centers handle after-service intake, assignment, processing and settlement in one place — with a different view and different editable fields per role.
Stack
- ASP.NET Core MVC
- EF Core
- MySQL
- log4net
- Docker
Contributed2026
NFC-based on-site safety inspection system
A web system and Android app where tapping the NFC tag on a piece of equipment opens its inspection form directly. The core is secure-tag verification that stops cloned tags and reused URLs.
Stack
- ASP.NET MVC 5
- Entity Framework 6
- Autofac
- Capacitor
- Android
- FCM
Own product2026
RecipeDrawer
A web service that collects recipes, plans a month of meals and turns the plan into a shopping list. Planned, built and operated in-house.
Stack
- .NET 9
- ASP.NET Core MVC
- MySQL
- Tailwind CSS
- Alpine.js
Have something you want built?
A rough idea is enough to begin with. We can work out the shape of it together.