Build vs Buy Software Calculator

What Is Build vs Buy?

Build means creating and operating a custom solution. Buy means adopting a commercial product or managed service. Hybrid combines a vendor base with custom development, integrations, workflows, middleware, data services, or AI components. The right model depends on cost, capacity, timing, constraints, strategic differentiation, ownership, and uncertainty.

Cash, Capacity, and Opportunity Cost

Cash TCO includes incremental money paid. Operating TCO adds the economic value of internal capacity allocated to the work. Economic TCO adds opportunity cost only when entered. Salaried labor is not free, but its capacity cost is not necessarily new cash spending. Opportunity cost is different again: it represents the value of the best alternative work forgone. Keeping these categories separate avoids double counting.

Custom Development Lifecycle

Build cost includes more than initial coding. Product management, design, testing, security, infrastructure, monitoring, support, maintenance, dependency updates, enhancements, modernization, documentation, incidents, and eventual replacement may all matter. AI-assisted development can reduce entered development hours, but it does not automatically eliminate architecture, testing, security, maintenance, or operational ownership.

Buying Software Still Requires Work

Commercial software can involve implementation, data migration, integration, training, administration, premium support, customization, internal support, price growth, and switching costs. Per-user and usage pricing may grow independently of vendor price changes. Tier changes must be entered by the user; the calculator never invents future pricing.

When Hybrid Makes Sense

Hybrid can deliver a commercial base quickly while preserving a custom layer for differentiated workflows, integrations, or data. It also combines vendor dependency with custom maintenance responsibility. Low-code and open-source approaches can be represented as Buy, Build, or Hybrid depending on how much internal logic and operational ownership they require.

Time-to-Value and Delayed Value

First usable value is when meaningful benefit begins; full value is when the expected steady-state benefit is reached. When monthly business value is entered, the model estimates value delayed during the ramp. This is a scenario assumption, not an accounting cost, and only appears in the Value-Adjusted view.

Constraints Before Cost

A lower TCO cannot compensate for a mandatory failure such as required deployment timing, SSO, data export, code ownership, compliance, or a hard budget ceiling. Options that fail remain visible and financially comparable, but they are labeled separately from options that meet current constraints.

Break-Even and Sensitivity

Break-even is calculated month by month within the selected horizon. If Build never reaches cumulative parity, the tool says so rather than extrapolating indefinitely. Sensitivity tests vary major assumptions by ±10% and ±20% without modifying saved inputs. It tests the model, not real-world project performance.

ChoiceRidge Methodology

The method is lifecycle-based, cost-type separated, time-aware, constraint-aware, scenario-based, uncertainty-aware, hybrid-aware, and affiliate-independent. All prices, timelines, hours, maintenance assumptions, constraints, and business value come from the user or an explicit local handoff.

Calculator Privacy

Vendor prices, staffing, engineering estimates, security needs, business value, constraints, and the final decision are processed and saved locally in this browser. They are not placed in the URL or sent to ChoiceRidge.

Frequently Asked Questions