AKS charges only for underlying VMs (control plane is free). Container Apps has consumption billing per vCPU-second and GB-second. Functions consumption plan charges per execution and GB-second. For 20 microservices: AKS is cheapest at scale (~$300–600/mo), Container Apps is simplest for moderate traffic (~$200–800/mo), Functions is cheapest for bursty/infrequent workloads (~$50–300/mo).
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