When Zapier Breaks: When to Build a Custom Integration

Zapier is excellent for proving a workflow. It is painful when that workflow becomes revenue-critical and nobody can explain why records duplicated overnight.

Common break patterns

• Someone adds a CRM field and three zaps stop firing
• Retries create duplicates because there is no idempotency key
• Transforms are too complex for friendly Zap templates
• Failures are invisible until a customer or finance team notices

What custom integration adds

Logging, replay queues, explicit mapping layers, and monitoring. You pay more upfront for engineering, but you stop paying every week in manual reconciliation.

A sane migration path

Replace the highest-risk zap first—usually the one touching money, inventory, or customer records. Run parallel until counts match, then retire the zap with confidence.