A virtual load balancer is the cloud-provider’s managed load-balancing service. The alternative is a software load balancer (HAProxy, NGINX, Envoy) running on a VM or in a container. The trade-off is operational: managed means the cloud provider operates it, software means the team operates it.
Table of contents
- What a virtual load balancer is
- The cloud-provider options
- The software options
- The trade-offs
- When to use virtual
- When to use software
- FAQ
What a virtual load balancer is
A virtual load balancer is a managed service that the team consumes instead of operating. The cloud provider runs the load balancer software, scales it, patches it, and exposes it as a service. The team configures the listeners, the target groups, the health checks, and the SSL termination.
The most common virtual load balancers in 2026:
- AWS Elastic Load Balancer (ELB). The leader. Application Load Balancer (ALB) for HTTP/HTTPS, Network Load Balancer (NLB) for TCP/UDP, Gateway Load Balancer (GWLB) for third-party virtual appliances.
- Azure Load Balancer. The runner-up. Standard SKU for production, Basic SKU for dev.
- Google Cloud Load Balancer. The third. Application Load Balancer for HTTP/HTTPS, Network Load Balancer for TCP/UDP, Proxy Network Load Balancer for advanced features.
The cloud-provider options
The cloud-provider options in 2026, ordered by adoption:
- AWS ELB. The leader. ALB, NLB, GWLB. The right answer when the team is on AWS.
- Azure Load Balancer. The runner-up. Standard SKU for production. The right answer when the team is on Azure.
- Google Cloud Load Balancer. The third. Global external HTTP(S) Load Balancer, regional external. The right answer when the team is on GCP.
- Cloudflare Load Balancer. The edge alternative. The right answer when the team wants the load balancing to happen at the edge, not at the origin.
The software options
The software options in 2026, ordered by adoption:
- HAProxy. The standard. The right answer when the team needs a high-performance L4/L7 load balancer with full control over the configuration.
- NGINX. The runner-up. The right answer when the team is already using NGINX for the web server and wants the same configuration for the load balancer.
- Envoy. The middle ground. The right answer when the team is running a service mesh (Istio, Consul) and wants the load balancer to be part of the mesh.
- Traefik. The middle ground. The right answer when the team is running containers and wants the load balancer to discover the services automatically.
The trade-offs
The trade-offs the team needs to understand:
- Cost. Virtual load balancers are typically priced per hour + per GB processed. The cost can be significant at high traffic. Software load balancers are priced per VM or per container.
- Control. Software load balancers give the team full control over the configuration. Virtual load balancers expose a subset of the configuration.
- Operational. Virtual load balancers are managed; the team does not operate them. Software load balancers are operated; the team is on the hook for patching, scaling, and the on-call.
- Performance. Software load balancers on a sufficiently large VM can match or exceed the cloud-provider’s managed offering. The trade-off is operational.
When to use virtual
The team that should use a virtual load balancer:
- The team that does not want to operate the load balancer.
- The team that is on a major cloud and the workload is a managed service.
- The team that has a small load-balancing volume and the cost is not significant.
- The team that does not have the engineering time to operate a software load balancer.
When to use software
The team that should use a software load balancer:
- The team that has a large load-balancing volume and the cost of a virtual load balancer is significant.
- The team that needs full control over the configuration.
- The team that has the engineering time to operate the load balancer.
- The team that wants to avoid vendor lock-in.
FAQ
What is a virtual load balancer?
A managed load-balancing service that the team consumes instead of operating. The cloud provider runs the load balancer software, scales it, and patches it.
What is the best virtual load balancer in 2026?
The right answer depends on the team. For AWS workloads: AWS ELB. For Azure workloads: Azure Load Balancer. For GCP workloads: Google Cloud Load Balancer. For edge: Cloudflare Load Balancer.
What is the best software load balancer in 2026?
HAProxy for the highest performance, NGINX for the most familiar configuration, Envoy for the service mesh, Traefik for the container-native experience.
What is the difference between ALB and NLB?
ALB (Application Load Balancer) is L7, HTTP/HTTPS, content-based routing. NLB (Network Load Balancer) is L4, TCP/UDP, raw TCP routing. ALB is for the workload that needs the URL path or the host header. NLB is for the workload that needs the raw TCP connection.
How do I choose between a virtual and a software load balancer?
Use virtual for the team that does not want to operate. Use software for the team that has the volume, the control, or the engineering time.
If you are sizing a load-balancing tier for a new project, the RunxBuild hosting calculator is the place to model the line items. The load balancer, the SSL, the bandwidth, the targets - each one is a separate number, and the team’s mental model for the platform is the sum of those numbers. The RunxBuild dashboard is where the team sees the actual load-balancer performance in one place.