Apache Kafka is the most expensive engine in this comparison, and the reason is structural: a usable Kafka cluster needs multiple brokers for replication, so even a “small” cluster has a real floor. Here is how the managed options compare as of June 2026.
Why Kafka costs more
A single-broker Kafka is not production-safe — you need at least three for replication. That multiplies the per-broker cost and sets a high baseline that you don’t see with a single-node cache or database.
AWS MSK (provisioned and serverless)
Amazon MSK offers two models:
| Model | Pricing | Small-cluster cost |
|---|---|---|
| Provisioned | $0.204/broker-hour (kafka.m7g.large) + $0.10/GB-month storage | 3 brokers ~$447/month + storage |
| Serverless | $0.75/cluster-hour + $0.10/GB in, $0.05/GB out, $0.0015/partition-hour | ~$548/month base + throughput |
Provisioned is cheaper for a steady cluster if you can size brokers; serverless removes sizing for spiky workloads but the base rate is high.
Confluent Cloud (serverless eCKU tiers)
Confluent Cloud prices by elastic CKU (eCKU):
| Tier | Pricing | Entry |
|---|---|---|
| Basic | $0 base, $0.14/eCKU-hour after first free | Usage-only |
| Standard | $0.75/eCKU-hour | ~$385/month |
| Enterprise | $1.75-2.25/eCKU-hour | ~$895/month |
| Dedicated | Pre-provisioned CKU | Contact sales |
Basic has no base cost and is cheapest for very low throughput; Standard’s ~$385/month entry buys a 99.9-99.99% SLA and the full ecosystem (Connect, ksqlDB, Flink, Schema Registry). A $400 trial credit is included.
Aiven (fixed plans, with a free tier)
Aiven for Kafka sells fixed monthly plans: a genuine free tier (5 topics, 250 KiB/s, powers off when idle), a Developer tier ($35/month), Startup-2 from $200/month and Business-4 from $500/month. Unlike many beliefs, Aiven Kafka does have a free tier.
Upstash Kafka is gone
Upstash Kafka was discontinued — deprecation announced September 2024, end-of-life around March 2025. New clusters can’t be created. If you were using it, migrate to MSK Serverless, Confluent or Aiven.
Which to choose
- Lowest cost, very low throughput: Confluent Basic (no base cost) or Aiven’s free tier.
- Steady cluster, AWS-native: MSK provisioned (~$447/month).
- Variable load, rich ecosystem: Confluent Standard or MSK Serverless.
- Predictable all-inclusive bill: Aiven Startup ($200/month).
See MSK vs Confluent and the full Kafka pricing breakdown, or model it in the estimator. Prices are a June-2026 snapshot; verify on each vendor’s pricing page.