An existing product may already handle most of your workflow. Before commissioning an application, identify the parts it handles well and the specific gaps people work around.
A custom app earns its cost when those gaps matter enough to justify implementation and ongoing ownership. That judgment needs more detail than “our process is unique.”
Write down the workaround
Follow a real task. Note where someone copies information, waits for an approval, reconciles conflicting records, or leaves the product to finish the work elsewhere. Separate inconvenience from a business rule the product cannot represent.
Check configuration and supported integrations before building a replacement. A focused extension may solve the problem while leaving the existing system responsible for the work it already handles well.
For example, a service business might keep its accounting product and add an approval workflow around incoming documents. That design still needs a clear source of truth and a controlled handoff. It should not create a second, unexplained version of financial records.
Compare the ongoing obligations
With off-the-shelf software, evaluate fit, configuration, permissions, exports, support, and how vendor changes affect the process. With custom software, add the ownership of implementation, dependency updates, operations, and future requirements.
Either option can create switching work. Ask for a usable export and identify what depends on the provider's runtime or service. Read the current contract rather than assuming that data access implies a complete migration path.
Estimate the cost of the complete workflow. Include integration maintenance, manual exceptions, review, and training. Avoid inventing a return-on-investment figure before observing how the task performs.
Distinguish a configuration gap from a workflow gap
Suppose the existing product already records a request, routes it to a reviewer, and exports the result, but the team dislikes the field order. Test configuration before commissioning a replacement. Rebuilding an entire workflow to rearrange a form may create a larger maintenance obligation than the problem warrants.
Now suppose staff must copy each approved request into another system because the product cannot make the required handoff. A supported integration or a small extension may solve that gap. The design still needs to handle a receiving-system failure and let the operator tell which records transferred.
A full custom application becomes a stronger candidate when the required process cannot be represented adequately through configuration or a bounded extension. Document those constraints rather than using “flexibility” as the entire justification.
Also define an exit condition for the custom layer. If the existing product later adds the missing capability, what data and history would you need to move back? Designing around a clear boundary helps you compare that later option without reconstructing what the custom software owns.
Test the narrowest useful solution
Use synthetic records to compare an existing product configuration, an extension, and a custom workflow where those options are feasible. Require the same successful result and relevant failure cases.
A good evaluation ends with evidence of what works and an explicit account of what remains manual. Manual review may be an appropriate part of the workflow, particularly for ambiguous or consequential decisions.
OBTO can be evaluated as the application layer for a custom workflow. Its platform page explains the direction. Start with the bounded task and verify its integration behavior instead of replacing a working system by default.
Keeping the accounting system and building a narrow approval layer may be enough. Evaluate that handoff before paying to recreate features the existing product already handles.