Should you buy a managed document assistant or build custom RAG?

Describe the requirements that would change your decision

Write down the document sources, user groups, access boundaries and place where answers must appear. Identify which requirements are essential now and which could wait. If a tool already supports the essential workflow, test that fit before assuming it needs to be rebuilt.

If the assistant will be part of a product you sell, include the customer experience and commercial requirements. Consider account separation, how the feature fits existing workflows and what your team must be able to change independently. A convenient internal tool and an embedded customer feature can have different requirements.

Evaluate both options against the same examples

Use representative questions and documents to compare a candidate platform with a proposed custom approach. Include information that is missing, conflicting or restricted. Agree what a useful answer looks like and when the system should decline to answer. This gives the comparison a practical basis beyond the quality of a sales demonstration.

Check the surrounding workflow as well. Can a user see the supporting material? What happens after a document changes or is removed? How are problems reported and investigated? Treat these as requirements to verify for each option, rather than assumptions about an entire product category.

When to test a managed product first

A managed product is a reasonable first candidate when its existing workflow, supported sources and permissions appear to fit. Run a bounded evaluation with your own examples and review the relevant terms. Determine which settings you can control, how data can be exported and what happens if the service or your needs change.

The question is whether the available product meets your requirements at an acceptable cost and effort. A custom proposal should explain a concrete gap it would address; “more flexibility” is not sufficient by itself.

When a custom implementation deserves consideration

These are reasons to investigate a custom build, not proof that one is automatically better. A first stage can test the most consequential gap before you commit to the complete implementation. It may also show that a managed product plus a smaller integration is sufficient.

• The feature must fit a specific product interface or business workflow.
• The required sources, update process or access boundaries are not adequately supported by the candidate tool.
• Your team needs control over evaluation, retrieval behavior or the way supporting evidence is presented.
• You need a clearly owned component with an agreed API, deployment approach and handover.

Compare the full commitment, then choose the next step

For each route, record implementation work, recurring charges, internal ownership and ongoing maintenance. Use the same usage assumptions and list what is excluded. Include the effort required to update sources, investigate failures and move to another solution. Avoid comparing a platform subscription alone with the entire cost of a custom project.

If the gap is still unclear, bring the requirements and examples to a free 20–30 minute call with Indext. We can scope a bounded first stage and provide a written scope and fixed price within two business days. First stages start from $5,000, rather than a fixed price for a complete RAG system.