Compare SLA guarantees across equivalent services on AWS, Azure, and GCP.
Last verified: April 2026
| Select | Provider | Service | SLA % | Monthly Downtime | Nines | Multi-AZ SLA | Notes |
|---|---|---|---|---|---|---|---|
| AWS | Amazon EC2 | 99.5% | 216 min | two and a half nines | 99.99% | Single instance SLA. Multi-AZ deployments qualify for 99.99%. | |
| Azure | Azure Virtual Machines | 99.9% | 43.2 min | three nines | 99.99% | Single VM with Premium SSD. Availability Set: 99.95%. Availability Zones: 99.99%. | |
| GCP | GCP Compute Engine | 99.5% | 216 min | two and a half nines | 99.99% | Single instance SLA. Multi-zone deployments qualify for 99.99%. |
| Select | Provider | Service | SLA % | Monthly Downtime | Nines | Multi-AZ SLA | Notes |
|---|---|---|---|---|---|---|---|
| AWS | Amazon EKS | 99.95% | 21.6 min | three and a half nines | — | Control plane SLA. | |
| Azure | Azure AKS | 99.95% | 21.6 min | three and a half nines | — | Uptime SLA with paid tier. Free tier: 99.5%. | |
| GCP | GCP GKE | 99.95% | 21.6 min | three and a half nines | — | Regional cluster SLA. Zonal clusters: 99.5%. |
| Select | Provider | Service | SLA % | Monthly Downtime | Nines | Multi-AZ SLA | Notes |
|---|---|---|---|---|---|---|---|
| AWS | Amazon S3 | 99.99% | 4.32 min | four nines | — | S3 Standard availability SLA. | |
| Azure | Azure Blob Storage | 99.99% | 4.32 min | four nines | — | RA-GRS read access: 99.99%. Hot LRS: 99.9%. | |
| GCP | GCP Cloud Storage | 99.95% | 21.6 min | three and a half nines | — | Standard multi-region: 99.95%. Standard regional: 99.9%. |
| Select | Provider | Service | SLA % | Monthly Downtime | Nines | Multi-AZ SLA | Notes |
|---|---|---|---|---|---|---|---|
| AWS | Amazon RDS | 99.95% | 21.6 min | three and a half nines | — | Multi-AZ deployment SLA. | |
| Azure | Azure SQL Database | 99.995% | 2.16 min | four nines | — | Business Critical zone-redundant: 99.995%. Business Critical: 99.99%. | |
| GCP | GCP Cloud SQL | 99.95% | 21.6 min | three and a half nines | — | Regional HA instance SLA. |
| Select | Provider | Service | SLA % | Monthly Downtime | Nines | Multi-AZ SLA | Notes |
|---|---|---|---|---|---|---|---|
| AWS | AWS Lambda | 99.95% | 21.6 min | three and a half nines | — | Standard SLA for Lambda function invocations. | |
| Azure | Azure Functions | 99.95% | 21.6 min | three and a half nines | — | Standard SLA for function app executions. | |
| GCP | GCP Cloud Functions | 99.95% | 21.6 min | three and a half nines | — | Standard SLA for function invocations. |
| Select | Provider | Service | SLA % | Monthly Downtime | Nines | Multi-AZ SLA | Notes |
|---|---|---|---|---|---|---|---|
| AWS | AWS ALB/NLB | 99.99% | 4.32 min | four nines | — | Application and Network Load Balancer SLA. | |
| Azure | Azure Load Balancer | 99.99% | 4.32 min | four nines | — | Standard SKU SLA. Basic SKU has no SLA. | |
| GCP | GCP Cloud Load Balancing | 99.99% | 4.32 min | four nines | — | Global and regional load balancer SLA. |
| Select | Provider | Service | SLA % | Monthly Downtime | Nines | Multi-AZ SLA | Notes |
|---|---|---|---|---|---|---|---|
| AWS | Amazon Route 53 | 100% | 0 min | infinite nines | — | 100% availability SLA for DNS queries. | |
| Azure | Azure DNS | 100% | 0 min | infinite nines | — | 100% availability SLA for valid DNS requests. | |
| GCP | GCP Cloud DNS | 100% | 0 min | infinite nines | — | 100% availability SLA for authoritative name lookups. |
| Select | Provider | Service | SLA % | Monthly Downtime | Nines | Multi-AZ SLA | Notes |
|---|---|---|---|---|---|---|---|
| AWS | Amazon CloudFront | 99.9% | 43.2 min | three nines | — | Standard CDN distribution SLA. | |
| Azure | Azure CDN | 99.9% | 43.2 min | three nines | — | Standard CDN profile SLA. | |
| GCP | GCP Cloud CDN | 99.95% | 21.6 min | three and a half nines | — | Covered under Cloud Load Balancing SLA. |
| Select | Provider | Service | SLA % | Monthly Downtime | Nines | Multi-AZ SLA | Notes |
|---|---|---|---|---|---|---|---|
| AWS | AWS VPN | 99.95% | 21.6 min | three and a half nines | — | Site-to-Site VPN connection SLA. | |
| Azure | Azure VPN Gateway | 99.95% | 21.6 min | three and a half nines | — | Standard SKU and above. Basic SKU has no SLA. | |
| GCP | GCP Cloud VPN | 99.99% | 4.32 min | four nines | — | HA VPN SLA. Classic VPN: 99.9%. |
| Select | Provider | Service | SLA % | Monthly Downtime | Nines | Multi-AZ SLA | Notes |
|---|---|---|---|---|---|---|---|
| AWS | AWS Fargate | 99.99% | 4.32 min | four nines | — | Fargate task availability SLA. | |
| Azure | Azure Container Apps | 99.95% | 21.6 min | three and a half nines | — | Standard SLA for Container Apps. | |
| GCP | GCP Cloud Run | 99.95% | 21.6 min | three and a half nines | — | Standard SLA for Cloud Run services. |
Select services from the tables above using the checkboxes to calculate a composite SLA for your architecture.
{
"filter": "all",
"comparisons": [
{
"category": "Compute (VMs)",
"bestSLA": "azure",
"services": [
{
"provider": "aws",
"service": "Amazon EC2",
"sla": "99.5%",
"monthlyDowntime": "216 min"
},
{
"provider": "azure",
"service": "Azure Virtual Machines",
"sla": "99.9%",
"monthlyDowntime": "43.2 min"
},
{
"provider": "gcp",
"service": "GCP Compute Engine",
"sla": "99.5%",
"monthlyDowntime": "216 min"
}
]
},
{
"category": "Managed Kubernetes",
"bestSLA": "aws",
"services": [
{
"provider": "aws",
"service": "Amazon EKS",
"sla": "99.95%",
"monthlyDowntime": "21.6 min"
},
{
"provider": "azure",
"service": "Azure AKS",
"sla": "99.95%",
"monthlyDowntime": "21.6 min"
},
{
"provider": "gcp",
"service": "GCP GKE",
"sla": "99.95%",
"monthlyDowntime": "21.6 min"
}
]
},
{
"category": "Object Storage",
"bestSLA": "aws",
"services": [
{
"provider": "aws",
"service": "Amazon S3",
"sla": "99.99%",
"monthlyDowntime": "4.32 min"
},
{
"provider": "azure",
"service": "Azure Blob Storage",
"sla": "99.99%",
"monthlyDowntime": "4.32 min"
},
{
"provider": "gcp",
"service": "GCP Cloud Storage",
"sla": "99.95%",
"monthlyDowntime": "21.6 min"
}
]
},
{
"category": "Managed Database (SQL)",
"bestSLA": "azure",
"services": [
{
"provider": "aws",
"service": "Amazon RDS",
"sla": "99.95%",
"monthlyDowntime": "21.6 min"
},
{
"provider": "azure",
"service": "Azure SQL Database",
"sla": "99.995%",
"monthlyDowntime": "2.16 min"
},
{
"provider": "gcp",
"service": "GCP Cloud SQL",
"sla": "99.95%",
"monthlyDowntime": "21.6 min"
}
]
},
{
"category": "Serverless Functions",
"bestSLA": "aws",
"services": [
{
"provider": "aws",
"service": "AWS Lambda",
"sla": "99.95%",
"monthlyDowntime": "21.6 min"
},
{
"provider": "azure",
"service": "Azure Functions",
"sla": "99.95%",
"monthlyDowntime": "21.6 min"
},
{
"provider": "gcp",
"service": "GCP Cloud Functions",
"sla": "99.95%",
"monthlyDowntime": "21.6 min"
}
]
},
{
"category": "Load Balancers",
"bestSLA": "aws",
"services": [
{
"provider": "aws",
"service": "AWS ALB/NLB",
"sla": "99.99%",
"monthlyDowntime": "4.32 min"
},
{
"provider": "azure",
"service": "Azure Load Balancer",
"sla": "99.99%",
"monthlyDowntime": "4.32 min"
},
{
"provider": "gcp",
"service": "GCP Cloud Load Balancing",
"sla": "99.99%",
"monthlyDowntime": "4.32 min"
}
]
},
{
"category": "DNS",
"bestSLA": "aws",
"services": [
{
"provider": "aws",
"service": "Amazon Route 53",
"sla": "100%",
"monthlyDowntime": "0 min"
},
{
"provider": "azure",
"service": "Azure DNS",
"sla": "100%",
"monthlyDowntime": "0 min"
},
{
"provider": "gcp",
"service": "GCP Cloud DNS",
"sla": "100%",
"monthlyDowntime": "0 min"
}
]
},
{
"category": "CDN",
"bestSLA": "gcp",
"services": [
{
"provider": "aws",
"service": "Amazon CloudFront",
"sla": "99.9%",
"monthlyDowntime": "43.2 min"
},
{
"provider": "azure",
"service": "Azure CDN",
"sla": "99.9%",
"monthlyDowntime": "43.2 min"
},
{
"provider": "gcp",
"service": "GCP Cloud CDN",
"sla": "99.95%",
"monthlyDowntime": "21.6 min"
}
]
},
{
"category": "VPN",
"bestSLA": "gcp",
"services": [
{
"provider": "aws",
"service": "AWS VPN",
"sla": "99.95%",
"monthlyDowntime": "21.6 min"
},
{
"provider": "azure",
"service": "Azure VPN Gateway",
"sla": "99.95%",
"monthlyDowntime": "21.6 min"
},
{
"provider": "gcp",
"service": "GCP Cloud VPN",
"sla": "99.99%",
"monthlyDowntime": "4.32 min"
}
]
},
{
"category": "Serverless Containers",
"bestSLA": "aws",
"services": [
{
"provider": "aws",
"service": "AWS Fargate",
"sla": "99.99%",
"monthlyDowntime": "4.32 min"
},
{
"provider": "azure",
"service": "Azure Container Apps",
"sla": "99.95%",
"monthlyDowntime": "21.6 min"
},
{
"provider": "gcp",
"service": "GCP Cloud Run",
"sla": "99.95%",
"monthlyDowntime": "21.6 min"
}
]
}
]
}The Multi-Cloud SLA Compare tool lets you compare Service Level Agreement terms, uptime guarantees, and credit policies across AWS, Azure, and GCP. Understanding SLA differences is critical when choosing providers for mission-critical workloads. This tool maps equivalent services across clouds and compares their SLA percentages, how downtime is measured, what credits are offered when SLAs are missed, and any notable exclusions or conditions that affect coverage.
You are presenting to the CTO on why your application needs multi-region deployment. You pull up the SLA comparison showing that a single-region architecture with EC2 + RDS + ALB has a composite SLA of 99.95% x 99.95% x 99.99% = 99.89%, translating to about 57 minutes of expected monthly downtime. Adding a second region with active-passive failover improves the composite to 99.9999%, making the $500/month cost of the standby region easy to justify against the $10,000/hour downtime cost.
Composite SLA calculation is multiplicative for serial dependencies. If your app chains 5 services each at 99.9%, your composite SLA is 99.9%^5 = 99.5%, which means 3.6 hours of expected monthly downtime instead of 43 minutes. Always calculate composite SLA before committing to availability targets.
SLA credits are almost never worth the downtime cost. AWS caps credits at 30% of the affected service's monthly bill, Azure at 25-100% depending on uptime. If your business loses $10,000 per hour of downtime, a $50 credit is meaningless. Design for resilience rather than relying on SLA credits.
Pay attention to how each provider measures downtime. AWS uses error rate thresholds (e.g., >5% error rate for EC2), Azure uses connectivity and availability metrics, and GCP uses request error rates. The same outage might trigger an SLA violation on one provider but not another.
The tool stores each provider's published SLA percentages for their major services in a normalized dataset. It displays these side-by-side with equivalent service mapping across clouds, and optionally calculates composite SLAs by multiplying individual SLA percentages for services in a serial dependency chain. For parallel/redundant configurations, it uses the formula 1 - (1-SLA)^N.
Was this tool helpful?
Disclaimer: This tool runs entirely in your browser. No data is sent to our servers. Always verify outputs before using them in production. AWS, Azure, and GCP are trademarks of their respective owners.