Custom apps · Selected work
Custom applications. Real architecture.
A look at systems we've built across consumer platforms, service operations, productivity and data — and what software at this level actually costs to create.
Simple on the surface. Powerful underneath.
Featured builds
Our most advanced systems.
Full platforms with real architecture behind them — accounts, data models, automation and administration built to run a business.
CAB intelligence practice
Experts in Advanced Agentic Workflow Orchestration.
We design coordinated systems of specialist AI agents, deterministic controls, human approvals, and delivery signals. The result is not a chatbot bolted onto software—it is an operating layer built to reason, route, verify, and escalate.
Applied AI architecture
Models, prompts and guardrails designed into the system — paired with deterministic rules wherever accuracy, pricing or compliance matters.
Workflow automation
Repetitive operational steps handled by the app itself, so owners and staff stop doing work software should be doing.
Intelligent app workflow design
Flows that adapt to the person using them: intake, extraction, routing, follow-up and reporting that respond to real answers.
Human-reviewed output
Every AI surface is reviewed by your assigned Code Architect before launch — nothing ships on a model's word alone.
Want to see how a complete CAB platform fits together? Explore the Demo →
We'll tell you where AI helps your build — and where it doesn't.
Representative builds
From focused workflows to full operations platforms.
These representative builds span restaurants, fitness, real estate, trades, healthcare and distribution — with the scope, timeline and cost of each spelled out.
Comparable CAB Build reflects the approximate CAB investment to create similar functionality and scope today. Final pricing depends on architecture, intelligence, integrations and risk.
How to read these numbers.
Pricing shown represents an approximate Columbus App Builders build range for software with comparable functionality, architecture, and complexity. Final pricing depends on confirmed requirements, integrations, deployment, and project scope.