INTERACTIVE SOFTWARE SELECTION TOOL
Compare software fit, implementation time, flexibility, integrations, control, maintenance and total cost before deciding how your business system should be built.
Use the calculator to test your own requirements and cost assumptions. The result is a structured starting point for shortlisting options; not an automatic procurement decision.
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START WITH THE BUSINESS REQUIREMENT
Off-the-shelf software is designed for a broad market and can usually be purchased or subscribed to without developing a new system from the beginning. Custom business software is designed or configured around a particular organisation’s users, processes, information and required outcomes.
Neither option is automatically better. Common, well-understood requirements are often served efficiently by established products. More distinctive or operationally important processes may justify a custom system, especially where the business needs specialised workflows, integrations, permissions, reporting or control.
The choice is also not always binary. A business may use an established platform for standard functions and add custom forms, integrations, portals, reports or workflow layers where differentiation is valuable.
“Custom” does not necessarily mean writing every component from scratch. A custom solution can combine established platforms, open-source components, low-code tools, APIs and purpose-built functionality. Likewise, off-the-shelf software may require configuration, migration, integration and ongoing administration before it works effectively inside the business.
INTERACTIVE CALCULATOR
Adjust the assumptions to reflect your proposed system. Use supplier estimates where available and conservative figures where they are not.
These factors influence whether a standard product or custom approach is more likely to fit.
Consider whether established products already support the process without major workarounds.
Include accounting systems, CRM platforms, forms, email, databases, devices and external APIs.
Consider roles, approval stages, exceptions, audit history, dashboards and reporting rules.
Ownership and portability depend on contracts, architecture and export options—not the word “custom” alone.
Examples include offline capture, device functions, unusual calculations, geolocation or industry-specific workflows.
A mature product can often be deployed sooner, although migration and configuration may still take time.
Adapting a weak process may be beneficial; forcing a differentiating process into a poor fit may not be.
Enter the expected costs in today’s rands. The calculator does not add inflation or future user growth.
YOUR INDICATIVE RESULT
Your requirements show a moderate need for flexibility and integration, while rapid implementation still matters.
Based on the seven priority sliders
This compares the difference in initial cost with the difference in monthly equivalent operating cost.
Actual suitability depends on product demonstrations, detailed requirements, data migration, contracts, security review, supplier capability, user testing and the quality of implementation.
TRANSPARENT METHODOLOGY
The calculator keeps requirements fit separate from cost. A cheaper option may still be unsuitable, while a stronger operational fit may not justify its additional cost.
The calculator applies a weighted score to seven factors. Higher workflow uniqueness, integration complexity, permission and reporting complexity, need for control, and specialised functionality increase the custom score. Greater launch urgency and willingness to adapt the process to standard software increase the off-the-shelf score.
| Factor | Weight | What a higher value tends to favour |
|---|---|---|
| Workflow uniqueness | 22% | Custom |
| Integration complexity | 16% | Custom or hybrid |
| Permissions, workflow and reporting complexity | 14% | Custom |
| Control, portability and flexibility | 18% | Custom, subject to contract and architecture |
| Specialised or offline functionality | 12% | Custom |
| Rapid implementation priority | 10% | Off-the-shelf |
| Willingness to adapt the process | 8% | Off-the-shelf |
Off-the-shelf total cost: Initial setup, migration and configuration + the selected period of base platform fees + per-user licence fees + annual integration, support and customisation costs.
Custom total cost: Initial design, build, migration and implementation + the selected period of monthly hosting, licences and support + the annual enhancement budget.
The model uses the same number of users throughout the selected period and calculates in today’s rands. It does not add inflation, user growth, financing costs, tax effects, internal staff time, downtime or opportunity cost.
The final direction gives greater weight to operational fit than cost. It also identifies situations where the fit and cost results point in different directions, in which case a hybrid or phased approach may deserve investigation.
Do not enter an unrealistically low custom-development estimate or compare it with an inflated software subscription. Obtain comparable estimates that cover the same scope, data migration, integrations, training, support and operating period.
DETAILED COMPARISON
The correct comparison is not simply subscription cost versus development cost. Assess the complete operating model, contractual position and expected life of the system.
| Decision area | Off-the-shelf software | Custom software |
|---|---|---|
| Initial implementation | Often faster when the product already supports the requirement and migration is manageable. | Usually requires more discovery, design, testing and phased delivery before launch. |
| Functional fit | Strongest where processes are common and the business can adopt the product’s structure. | Can be designed around distinctive processes, roles, rules and outputs. |
| Configuration and workarounds | May require configuration, add-ons, spreadsheets or manual steps where the product does not fit. | Can reduce workarounds, but poorly defined requirements can simply reproduce a weak process. |
| Integrations | May offer established connectors, but availability, limits and pricing depend on the vendor. | Can support purpose-built integrations where APIs and access are available, with ongoing maintenance required. |
| Control and ownership | The vendor usually controls the product roadmap, terms, pricing and supported features. | May provide greater control, but source code, data, hosting and intellectual-property rights must be defined contractually. |
| Data portability | Export quality and exit options vary. Test whether complete, usable data can be retrieved. | Can be designed for export and interoperability, but this must be included in the requirements and architecture. |
| Maintenance | Core maintenance and upgrades are usually handled by the supplier, although configuration and integrations still need management. | The owner needs a clear arrangement for monitoring, backups, security updates, bug fixes and future compatibility. |
| Cost structure | Lower initial barriers are common, with recurring subscriptions, per-user fees and possible premium features. | Higher initial investment is common, followed by hosting, support and planned enhancement costs. |
| Scaling | Technical scaling may be handled by the vendor, while licences and plan limits can increase cost. | Architecture can be designed for expected growth, but scaling is not automatic and must be planned. |
| Security and supplier risk | Requires due diligence on the vendor, product, hosting, sub-processors, access controls, incidents and continuity. | Requires secure development, testing, dependency management, hosting controls and ongoing maintenance. |
| Future change | Changes depend on available settings, APIs, marketplace extensions and the vendor roadmap. | Changes can be prioritised around the business, subject to budget, architecture and development capacity. |
| Supplier dependence | Dependence is concentrated in the product vendor and its commercial terms. | Dependence may shift to a developer or technical partner unless documentation, access and handover are planned. |
LOOK BEYOND THE PRICE TAG
A fair comparison should cover the same scope and period for both options. A cheap monthly subscription may become expensive across many users, while a custom quotation may omit support, hosting or future improvements.
A better-fitting system may reduce administration, errors and delays, but the financial value depends on what the organisation does with the recovered capacity. Include operational benefits in the business case without pretending every saved hour becomes an immediate cash saving.
PRACTICAL SELECTION PROCESS
The calculator can narrow the direction, but the decision should be validated through requirements, demonstrations, testing and contractual review.
State what is currently failing, what should improve and how success will be measured before discussing products or technology.
Document users, steps, systems, data, volumes, delays, exceptions, approvals, reports and existing workarounds.
Identify what is mandatory for legal, operational or security reasons and what would merely be convenient.
Compare suitable products, configurable platforms, hybrid approaches and custom development against the same requirements.
Ask suppliers to demonstrate your scenarios and price the same scope, users, integrations, migration, support and operating period.
Review data access, export, intellectual property, service levels, security, sub-processors, support responsibilities and termination arrangements.
Test the option with real users and representative data before a broad rollout or irreversible migration.
Define who manages users, data quality, support, changes, supplier performance, security issues and future improvements.
AVOID EXPENSIVE MISTAKES
RELATED RESOURCES
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FREQUENTLY ASKED QUESTIONS
No. Off-the-shelf software often has a lower initial cost, but the total cost depends on licences, users, add-ons, integrations, support, configuration and the period of use. Custom software often requires a larger initial investment but may have a different recurring-cost structure. Compare equivalent scope across several years.
Custom software can be designed for greater flexibility, but the actual result depends on its architecture, documentation, contract and ongoing development arrangement. A poorly built custom system may be harder to change than a well-supported configurable platform.
No. Payment for development does not automatically establish ownership of source code, intellectual property, hosting accounts or third-party components. The contract should clearly define ownership, licences, access, data rights, documentation and handover.
Often, yes. Many products provide configuration, custom fields, automation rules, APIs, extensions or marketplace applications. The important question is whether the available customisation is supported, maintainable and sufficient for the requirement.
A hybrid approach uses established products or platforms for standard functions and adds custom integrations, workflows, portals, forms, reports or specialised modules where needed. This can reduce unnecessary development while preserving flexibility in important areas.
Use a period that reflects how long the business realistically expects to use the system. Three to five years is often useful for planning, but rapidly changing requirements may justify a shorter horizon and stable core systems may require a longer one.
No. Cost is important, but the system must also meet essential operational, security, data, integration and support requirements. The cheapest option becomes expensive when it creates persistent workarounds, errors, delays or an early replacement project.
It is an indicative planning tool based on the values and priorities entered. It does not evaluate a specific product, supplier, contract, codebase or security environment. Validate the result through detailed requirements, demonstrations, quotations, due diligence and user testing.
Avoid unnecessary custom development when a reliable existing product already meets the requirement, the process is not stable, the business lacks an owner for the system, the expected value does not justify the lifecycle cost or the organisation cannot support ongoing maintenance.
Consider it when the process is distinctive or strategically important, standard products create serious workarounds, several systems must be connected, permissions and reporting are specialised, or the cost and limitations of existing products become unreasonable over time.
The comparison framework draws on established build-versus-buy, interoperability and technology supply-chain principles. These sources do not endorse the calculator’s weighting or provide a universal decision formula.
This page provides general educational guidance for South African businesses and abroad. It does not constitute legal, financial, procurement, cybersecurity or software-architecture advice.
MAKE THE DECISION AROUND THE PROCESS
Repautomate can help you document the requirement, identify suitable off-the-shelf and custom approaches, and implement the option that provides the strongest practical fit.
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