Confluent Cloud vs WarpStream
SEPT 2026 auditA comparison of Confluent Cloud and WarpStream built from values read directly from each provider's own documentation, with the source recorded against every figure.
The short answer
Choose Confluent Cloud if…
The reference implementation, and the one that shows its working. Three meters are each published with a rate, and the page states they are pre-replication — a disclosure the others skip entirely. Standard at about $385 a month is the cheapest 99.99% SLA in this category.
Editorial · Palash Bagchi · approved
Choose WarpStream if…
Write-heavy workloads where inter-zone replication is the bill. Data is acknowledged straight into your own object storage, so partitions, reads and storage are not metered at all and only gigabytes written are — $0.01 falling to $0.003 at volume.
Editorial · Palash Bagchi · approved
Consider something else if…
- Confluent Cloud: Your traffic is write-heavy and you are counting cents. Three meters compound: eCKU-hours accrue whether or not you publish, data in and out is $0.05 a gigabyte on Basic, and storage is $0.08 per gigabyte-month on every tier below Freight.
- WarpStream: You need an availability commitment at the entry price. The $100 Dev tier carries no uptime SLA whatsoever; the first one is Fundamentals at $500, five times the floor. Lower latency is a Pro-tier feature, which is the honest cost of the object-storage design.
5 sourced criteria separate them — see where, with sources, below.
Pick the criteria you care about. The chart counts how many of them lean toward each provider — the same read as scanning the bars below, just totalled for the ones you chose.
Confluent Cloud 0
WarpStream 0
At a glance.
| Criterion | Confluent Cloud | WarpStream |
|---|---|---|
| Pricing | ||
| Entry paid plan | Basic gives the first eCKU free and charges $0.14 per eCKU-hour after it, so a small cluster starts near zero. Standard, the first tier with a 99.99% SLA, starts at about $385 a month. | $100 a month for the Dev tier, which carries NO uptime SLA, before any per-gibibyte write charge. The first tier with an SLA is Fundamentals at $500. |
| Pricing model | Three meters running together. Compute is billed per eCKU-hour — an elastic Confluent Kafka Unit that autoscales — data in and out is billed per GB, and data at rest per GB-month. The rates are published pre-replication, so a replicated topic costs a multiple of the figure shown. | Two lines, not one. A cluster-tier fee — $100 a month for Dev, $500 for Fundamentals, $1,500 for Pro — plus write throughput metered per gibibyte: $0.01/GiB to 50 TiB, falling to $0.003 beyond 6,250 TiB. Reads, partitions and storage are not billed; data sits in your own object storage. |
| Infrastructure | ||
| Uptime SLA | 99.99% on Standard and above. Basic carries no uptime commitment. | None at all on the $100 Dev tier. 99.9% on Fundamentals, 99.99% on Pro, and 99.999% on Enterprise only with multi-region clusters — 99.99% without. |
| Storage | ||
| Storage price | $0.08 per GB-month on Basic, Standard and Enterprise alike; $0.03 on Freight, which writes direct to object storage. | Not charged separately. Data is persisted directly to your own object storage, so durability is the object store's bill rather than WarpStream's. |
| Streaming | ||
| Partition limit | No figure is published. Enterprise advertises "enhanced partition limits" over Standard without saying what either limit is, so the ceiling cannot be compared with a vendor that states one. | 4,096 on Dev, 16,384 on Fundamentals, 50,000 on Pro and 200,000+ on Enterprise. Partitions are capped by tier and not billed. |
Where they differ.
Entry paid plan
- Confluent Cloud
- Basic gives the first eCKU free and charges $0.14 per eCKU-hour after it, so a small cluster starts near zero. Standard, the first tier with a 99.99% SLA, starts at about $385 a month.
- WarpStream
- $100 a month for the Dev tier, which carries NO uptime SLA, before any per-gibibyte write charge. The first tier with an SLA is Fundamentals at $500.
Sources (2) →Sources ↓
- Confluent Cloud Pricing ↗
“standard starting at ~$385/month great for most production-ready use cases with an extended feature set.”
Read 2026-09-16 · official pricing
- WarpStream Pricing ↗
“uptime sla none 99.9% 99.99% 99.999%* cluster pricing $100/m $500/m $1500/m contact”
Read 2026-09-16 · official pricing
Pricing model
- Confluent Cloud
- Three meters running together. Compute is billed per eCKU-hour — an elastic Confluent Kafka Unit that autoscales — data in and out is billed per GB, and data at rest per GB-month. The rates are published pre-replication, so a replicated topic costs a multiple of the figure shown.
- WarpStream
- Two lines, not one. A cluster-tier fee — $100 a month for Dev, $500 for Fundamentals, $1,500 for Pro — plus write throughput metered per gibibyte: $0.01/GiB to 50 TiB, falling to $0.003 beyond 6,250 TiB. Reads, partitions and storage are not billed; data sits in your own object storage.
Sources (2) →Sources ↓
- Confluent Cloud Pricing ↗
“eCKU ($/eCKU-hour) first eCKU free, then $0.14 $0.75 $1.75 - $2.25 $2.25 (minimum 2 eCKUs) data in/out (ingress/egress) ($/GB) $0.05 $0.035 - $0.050 $0.020 - $0.050 $0.014 - $0.030 data stored ($/GB-month) $0.08 $0.08 $0.08 $0.03 prices shown are pre-replication.”
Read 2026-09-16 · official pricing
- WarpStream Pricing ↗
“uptime sla none 99.9% 99.99% 99.999%* cluster pricing $100/m $500/m $1500/m contact [...] write throughput tiers 50 TiB $0.01/GiB 250 TiB $0.0075/GiB 1250 TiB $0.0055/GiB 6250 TiB $0.004/GiB remainder $0.003/GiB”
Read 2026-09-16 · official pricing
Uptime SLA
99.99% on Standard and above. Basic carries no uptime commitment.
None at all on the $100 Dev tier. 99.9% on Fundamentals, 99.99% on Pro, and 99.999% on Enterprise only with multi-region clusters — 99.99% without.
Sources (2) →Sources ↓
- Confluent Cloud Pricing ↗
“everything in basic high availability with 99.99% uptime SLA infinite storage audit logs to detect security threats”
Read 2026-09-16 · official pricing
- WarpStream Pricing ↗
“uptime sla none 99.9% 99.99% 99.999%* cluster pricing $100/m $500/m $1500/m contact [...] * 99.999% uptime sla for enterprise requires multi-region clusters (99.99% without).”
Read 2026-09-16 · official pricing
Storage price
- Confluent Cloud
- $0.08 per GB-month on Basic, Standard and Enterprise alike; $0.03 on Freight, which writes direct to object storage.
- WarpStream
- Not charged separately. Data is persisted directly to your own object storage, so durability is the object store's bill rather than WarpStream's.
Sources (2) →Sources ↓
- Confluent Cloud Pricing ↗
“data stored ($/GB-month) $0.08 $0.08 $0.08 $0.03”
Read 2026-09-16 · official pricing
- WarpStream Pricing ↗
“data is durably persisted to object storage before warpstream provides an acknowledgement to the producer. once data is written to object storage, replication is handled by the object store.”
Read 2026-09-16 · official pricing
Partition limit
- Confluent Cloud
- No figure is published. Enterprise advertises "enhanced partition limits" over Standard without saying what either limit is, so the ceiling cannot be compared with a vendor that states one.
- WarpStream
- 4,096 on Dev, 16,384 on Fundamentals, 50,000 on Pro and 200,000+ on Enterprise. Partitions are capped by tier and not billed.
Sources (2) →Sources ↓
- Confluent Cloud Pricing ↗
“everything in basic and standard private networking gbps+ autoscaling enhanced partition limits”
Read 2026-09-16 · official pricing
- WarpStream Pricing ↗
“maximum partitions 4,096 16,384 50,000 200,000+”
Read 2026-09-16 · official pricing
When these numbers change, hear about it. Sources are re-checked monthly; a repricing goes out as a short note.
Documented by only one.
These criteria are published by one provider and not the other. An absence here means we have not found a source, not that the feature is missing.
Questions this comparison answers.
Entry paid plan: Confluent Cloud or WarpStream?
Confluent Cloud: Basic gives the first eCKU free and charges $0.14 per eCKU-hour after it, so a small cluster starts near zero. Standard, the first tier with a 99.99% SLA, starts at about $385 a month.
WarpStream: $100 a month for the Dev tier, which carries NO uptime SLA, before any per-gibibyte write charge. The first tier with an SLA is Fundamentals at $500.
Should I choose Confluent Cloud or WarpStream?
Pick Confluent Cloud if The reference implementation, and the one that shows its working. Three meters are each published with a rate, and the page states they are pre-replication — a disclosure the others skip entirely. Standard at about $385 a month is the cheapest 99.99% SLA in this category.
Pick WarpStream if Write-heavy workloads where inter-zone replication is the bill. Data is acknowledged straight into your own object storage, so partitions, reads and storage are not metered at all and only gigabytes written are — $0.01 falling to $0.003 at volume.