Zapier bills per task, and a task is every action executed, not every automation triggered. A workflow chaining six actions burns six tasks on every run.
That is where intuition fails: you think in number of automations, the invoice is computed in number of steps executed. The same process, enriched over the months with three filters and two formatting steps, doubles its consumption without a single new workflow being created.
Practical consequence: the cheapest alternatives are not the ones with the lowest sticker price but the ones whose model does not multiply with step count — Make per operation, Pabbly flat-rate, n8n or Activepieces self-hosted. That is why the table below sorts by billing model rather than by price.
The second reason, rarer but decisive when it lands: the logic ceiling. As soon as a process needs loops, error recovery or batch handling, Zapier hits its limits before you hit yours.