A martech stack accumulates the same way clutter accumulates anywhere else, one reasonable decision at a time, made by different people, at different points, with no single owner ever stepping back to look at the whole picture. This is the checklist for that step-back review.

Tool inventory and ownership

  • List every tool with marketing data access, not just the obvious ones (email platform, CRM), but every browser extension, Chrome plugin, and app-marketplace integration with write access to customer data.
  • Assign an owner to each tool. A tool with no clear owner is the one most likely to keep running unused, unmonitored, and unbilled-for-value long after it stopped being useful.
  • Check last-login and last-usage dates where available, a tool nobody has opened in three months is a strong candidate for cancellation or consolidation.

Redundancy and consolidation

  • Identify overlapping tools doing substantially the same job (two form builders, two SMS platforms, two scheduling tools), usually the result of different people adopting different tools at different times.
  • Compare actual usage, not feature lists, when deciding which redundant tool to keep, the one with lighter feature coverage but heavier actual daily use is often the better one to retain.
  • Calculate true redundant cost including seats, add-ons, and any per-contact or per-usage fees, not just the base subscription price.

Integration health

  • Verify each integration is actually syncing correctly, not just configured, by spot-checking a handful of records for data freshness and completeness.
  • Check for silent failures, integrations that stopped working without triggering any visible error, a common and easy-to-miss failure mode.
  • Confirm data flows in the direction expected, some integrations sync one-way when the team assumes it's bidirectional, leaving stale data in one system.

Data quality and governance

  • Check for duplicate or conflicting customer records across systems that should be unified but have drifted apart.
  • Confirm data retention settings comply with current privacy requirements, since defaults on some platforms retain data longer than policy allows.
  • Review who has admin-level access across each tool, a common gap alongside general access control reviews.

Turning findings into action

An audit that produces a long list of findings with no prioritization just becomes a document nobody acts on. Rank findings by a combination of cost impact and risk, unused paid tools and silently broken integrations first, cosmetic cleanup last, and set an actual owner and deadline for each item before the audit is considered complete.

FAQ

How often should a marketing tech stack be audited?

Once a year at minimum, and after any major change, a new hire taking over marketing operations, a CRM migration, or a significant headcount change. Stacks accumulate unused tools and broken integrations gradually, so an annual audit catches drift before it compounds into a much larger cleanup project.

  • Once a year is a reasonable minimum cadence for most growing companies.
  • Audit again after major changes, new ops hires, CRM migrations, or headcount shifts.

What's the most common finding in a marketing tech stack audit?

Tool redundancy is the most common finding, two or more tools doing largely the same job because they were adopted at different times by different people, with nobody consolidating afterward. The second most common is broken or silently degraded integrations that stopped syncing correctly at some point without anyone noticing, since the absence of an error is easy to mistake for the absence of a problem.

  • Redundant tools doing overlapping jobs is the single most common audit finding.
  • Silently broken integrations often go unnoticed because nothing visibly errors out.