Buy when an existing product supports the essential workflow. Consider building when a specific gap creates enough business value to justify development and ongoing ownership.
The decision starts with what your team needs to do, not a list of attractive features.
Start with one complete workflow
Write down who starts the work, what information they need, who approves changes, and what happens when an input is missing. Include the exception, not just the expected path.
Two tools may both offer approvals. One may support a single approver while your workflow needs conditional decisions across departments. That difference matters more than a long list of shared features.
Separate requirements into essential, useful, and preference. Challenge the essentials: an established process is not automatically a reason to build software. Changing the process may be simpler.
Compare three options
The choice is often between buying a product, extending one, and building an application.
Buy when the workflow is common and an existing tool handles the important steps. Check permissions, exports, configuration limits, and pricing at your expected usage.
Buy and integrate when a product fits most of the work but needs to exchange data with other systems. Investigate API coverage, access costs, failure handling, and who maintains the connection.
Build when a valuable workflow cannot be supported acceptably by available tools. Investigate scope uncertainty, delivery capacity, operational ownership, and maintenance funding.
A small integration around a suitable product can solve the important gap without creating a new platform.
Count the whole cost
Compare options over the same planning period. Include the same categories in each estimate:
- Getting started: discovery, configuration or development, migration, and training.
- Running: subscriptions, hosting, monitoring, support, and administration.
- Changing: new workflows, integration updates, testing, and vendor changes.
- Leaving: exporting usable data, replacing dependencies, and migrating to another system.
Model more than one usage scenario. A seat-based subscription changes as more people need access. Custom software costs change with volume, support needs, and the pace of development.
Avoid treating every hour saved as cash saved unless there is a credible plan for that capacity. Record the assumptions behind the expected benefit.
Test the difficult integration early
“An API is available” does not prove your workflow is possible. Check whether you can read and write the exact records you need, with the required permissions and frequency.
For example, an order workflow may need customer details, current pricing, stock availability, and a confirmed reservation. A read-only stock endpoint cannot complete the reservation.
Trace one transaction through the proposed system, including a failed request and a retry. Identify duplicates, stale data, and partial updates. If access is uncertain, record it as a dependency rather than assuming it can be solved later.
Write a decision record
For each option, answer these questions with evidence from a trial or review where possible. Mark guesses explicitly.
- Outcome: what observable problem will it solve, and for whom?
- Fit: which essential steps work now, need configuration, or need code?
- Constraints: which access, data, integration, or deployment restrictions apply?
- Ownership: who can administer, support, and change the system?
- Cost: which assumptions make it affordable, and what if they change?
- Exit: can you export usable data and replace the system?
- Unknowns: which unanswered question could reverse the decision?
Do not average away a blocking requirement with a high overall score. If the tool cannot support an essential permission boundary, resolve that issue before comparing convenience features.
Choose the next small step
If a product looks suitable, trial a representative workflow with realistic test data. If a custom build looks necessary, define a narrow first release and investigate the highest-risk assumption before estimating the whole roadmap.
Write down what would change your mind. It could be a successful vendor trial, an API limitation, or a maintenance cost your team cannot support. A useful decision remains open to better evidence.
Put it into practice.
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