Decision guide
Build a custom tool or use an existing product?
There is no single answer. Choose based on how unique the process is, how well existing products fit, and the real cost of compromises — not technology fashion.
Practical criteria
Use these questions before choosing a direction.
Is the process unique to the business?
If most of it matches the industry and a mature product exists, evaluate buying first.
How much compromise does a shelf product require?
If it forces critical process changes or many manual workarounds, the hidden cost is high.
Where is human review or approval required?
Define who reviews exceptions and approves actions, then check whether an existing product supports the required workflow and permissions or needs adaptation.
What is the first scope?
Sometimes start with an existing product for part of the flow, and build a custom piece only where it falls short.
Three scenarios that illustrate the decision
These are illustrative scenarios. Each project requires a review of its requirements, existing systems and total cost before choosing an approach.
When to start with an existing product
A company manages customer requests in email and spreadsheets and needs ownership, reminders and status tracking. If an existing CRM or service-management product meets the workflow and permission requirements, evaluate configuring it before commissioning a new system. The work focuses on defining the process, preparing data and helping the team adopt it.
Check: requirements fit, licence costs, integrations and the ability to export your data.
When a custom tool may be justified
An operations team reviews document packs arriving in different formats. It must compare information with business rules, identify missing data and route exceptions to the right reviewer. If evaluated products cannot meet the essential requirements, consider a custom tool combining information extraction, defined validation rules and a workspace for human review.
Check: data quality, accuracy on real examples, correction workflows and long-term maintenance.
When a combined approach fits best
An ERP continues to manage core business records and transactions, while a complementary tool prepares information for a management report. The tool collects data from approved sources, runs reconciliation checks and helps draft explanations for exceptions. A responsible team member reviews and approves the report before distribution.
Check: data access, the source of truth for each field, permissions and read-only integration as a starting point where possible.
How App Planner helps decide
In process mapping we separate what to buy, what to build, and what to simplify without new technology — so you do not build for its own sake.
Not sure which fits?
Describe the process — we will help break it into a build-vs-buy decision without pressure to sell development.