Best Load Balancing

Load balancing software helps distribute resources and incoming traffic to websites or applications. High-traffic sites require distribution tools to effectively scale infrastructure support and ensure proper functionality. These tools help network administrators and IT managers control and distribute traffic across servers, server farms, or server pools. Some solutions provide automation via balancing algorithms that identify fluctuations and distribute resources efficiently. Without load balancing software, companies with high-volume traffic and those with rapidly fluctuating traffic flows would waste resources and potentially damage server equipment. Inefficient resource usage could cause poor functionality, and damaged infrastructure hardware could cause complete site or application failure.

To qualify for inclusion in the Load Balancing category, a product must:

Monitor web traffic and distribute resources
Scale infrastructure workloads to match traffic
Provide or integrate with failover and backup services

Top 10 Load Balancing

  • Kemp
  • Nginx
  • Azure Traffic Manager
  • Micro Focus Silk Performer
  • AWS Elastic Load Balancing
  • BIG-IP Cloud Edition
  • Azure Load Balancer
  • Google Cloud Load Balancing
  • Traefik
  • Citrix ADC

Compare Load Balancing

G2 takes pride in showing unbiased reviews on user satisfaction in our ratings and reports. We do not allow paid placements in any of our ratings, rankings, or reports. Learn about our scoring methodologies.
Sort By:
Results: 93
View Grid®
Adv. Filters
(38)4.9 out of 5

Kemp powers the secure, always-on application experience [AX] that enterprises and service providers demand. Kemp’s load balancing, network performance monitoring, and network detection and response solutions deliver maximum value through simplified deployments, flexible licensing, and top-rated technical support. Kemp is the world’s most-popular application experience solution with more than 100,000 deployments in 138 countries. Take control of your AX at

(87)4.6 out of 5
Entry Level Price:Starting at $2500 per year

NGINX, Inc. is the company behind NGINX, the popular open source project trusted by more than 400 million sites. We offer a suite of technologies for developing and delivering modern applications. The NGINX Application Platform enables enterprises undergoing digital transformation to modernize legacy, monolithic applications as well as deliver new, microservices‑based applications. Companies like Netflix, Starbucks, and McDonalds rely on NGINX to reduce costs, improve resiliency, and speed innov

(13)4.2 out of 5

Azure Traffic Manager is a cloud-based load balancing service that allows you to control the distribution of user traffic for service endpoints in different datacenters.

(26)4.3 out of 5

Micro Focus Silk Performer (formerly Borland Silk Performer) is designed to deliver a consistent user experience anytime, anywhere, and on any device.

(19)4.2 out of 5

Elastic Load Balancing automatically distributes incoming application traffic across multiple targets, such as Amazon EC2 instances, containers, and IP addresses. It can handle the varying load of your application traffic in a single Availability Zone or across multiple Availability Zones. Elastic Load Balancing offers three types of load balancers that all feature the high availability, automatic scaling, and robust security necessary to make your applications fault tolerant.

(18)3.9 out of 5

BIG-IP Cloud Edition provides application services ranging from access and acceleration to security to intelligent traffic management.

(12)4.3 out of 5

Azure Load Balancer is a built-in load balancing for cloud services and virtual machines, you can create highly-available and scalable applications in minutes. Azure Load Balancer supports TCP/UDP-based protocols such as HTTP, HTTPS, and SMTP, and protocols used for real-time voice and video messaging applications.

(16)4.3 out of 5

High performance, scalable load balancing on Google Cloud Platform

(14)4.6 out of 5
Entry Level Price:Free Open Source

Traefik is the leading open source cloud-native load balancer and ingress controller for HTTP and TCP-based applications that is easy, dynamic, automatic, fast, full-featured, production proven, provides metrics, and integrates with every major cluster technology. Built on top of Traefik, Traefik Enterprise Edition brings exclusive distributed features with high performance capabilities that enable to load balance applications, secure services with authentication and encryption, and provide end

(12)3.3 out of 5

Citrix ADC is an application delivery and load balancing solution that provides a high-quality user experience for your web, traditional, and cloud-native applications regardless of where they are hosted.

(15)4.3 out of 5

An HTTP proxy/HTTP monitor/Reverse Proxy that enables a developer to view all of the HTTP and SSL/HTTPS traffic between the internet.

(20)4.6 out of 5

Varnish Software’s powerful caching technology helps the world’s biggest content providers deliver lightning-fast web and streaming experiences for huge audiences, without downtime or loss of performance. Our solutions combine open-source flexibility with enterprise robustness to speed up media streaming services, accelerate websites and APIs, and enable global businesses to build custom CDNs, unlocking unbeatable content delivery performance and resilience.

(8)3.9 out of 5

Azure Application Gateway gives you application-level routing and load balancing services that let you build a scalable and highly-available web front end in Azure.

(21)4.3 out of 5

HashiCorp Consul provides a distributed service networking layer to connect, secure, and configure services across any runtime platform. Consul service discovery enables service-to-service communication in modern microservices infrastructures with a service registry that keeps a real-time list of services, their location, and their health. Consul service mesh provides a dedicated networking layer to handle microservice networking challenges, including service discovery, service segmentation, ro

(8)4.2 out of 5
Entry Level Price:FREE Open Source

HAProxy is the world’s fastest and most widely used open source software load balancer and application delivery controller. Built on top of HAProxy, HAProxy Enterprise brings enterprise class features, services and premium support.

(5)4.7 out of 5

CloudTest provides a comprehensive performance platform for quickly validating and optimizing web and mobile user experience.

(6)3.6 out of 5

Control-M for Mainframe quickly and securely automates workload management, reduces risk and errors, and gives you access to the information you need to unlock the full value of your mainframe.

(4)3.8 out of 5

Highly demanding enterprise networks require full-featured application delivery controller that optimizes application load balancing and performance while providing protection from an ever-expanding list of intrusions and attacks. The Barracuda Load Balancer ADC is a Secure Application Delivery Controller that enables Application Availability, Acceleration and Control, while providing Application Security Capabilities. Available in hardware, virtual and cloud instances, the Barracuda Load Balan

(3)4.7 out of 5

Performance-optimized SANtricity software delivers data with high IOPs, high throughput and low latency to all your data analytics, video surveillance, and backup apps.

(2)5.0 out of 5

Avi Networks enables public-cloud-like simplicity and flexibility for application services such as load balancing, application analytics, and security in any data center or cloud.

Our Cloud Load Balancer is the only cloud traffic routing service you need to ensure availability of websites and applications. Total Uptime’s Cloud Load Balancer gives you complete control over network traffic on the Internet before it gets to the datacenter. Use it for load balancing, failover or disaster recovery. It is completely datacenter independent so your infrastructure can be anywhere. Using a long list of advanced server health checks, the Cloud Load Balancer continuously monitors n

(1)3.0 out of 5

A10 Thunder ADC enhances integration with Kubernetes to monitor changes to containers, notifying the Harmony Controller to synchronize the Lightning ADC configuration with the new environment.

(1)3.0 out of 5

Alibaba Cloud Server Load Balancer (SLB) distributes traffic among multiple instances to improve the service capabilities of your applications. You can use SLB to prevent single point of failures (SPOFs) and improve the availability and the fault tolerance capability of your applications. Promotions: EIP is now available in Alibaba Cloud's international regions. Alibaba Cloud also offers 15% discount for EIP service in the Hong Kong region.

(2)3.0 out of 5

Alteon VA is a fully-featured Alteon application delivery controller (ADC), packaged as a virtual load balancer running on virtualized server infrastructure.

(1)5.0 out of 5

(1)4.0 out of 5

FUJITSU ETERNUS® Management Software

(1)4.5 out of 5

FastlyLayer 7 load balancer allows you to define content-aware routing decisions while ensuring instant convergence and failover. Unlike DNS-based solutions, you get immediate and granular control. We also provide improved performance and cost savings over ADCs, especially during flash traffic.

(1)4.0 out of 5

Load balance traffic among your servers to improve uptime and easily scale your applications by adding or removing servers, with minimal disruption to your traffic flows

(1)4.5 out of 5
Entry Level Price:$3,995

The Enterprise VA R20 delivers awesome load balancing power at an incredible price. This virtual appliance offers unrestricted throughput and bandwidth. You’ll probably never need to upgrade the license, but if you do, we provide a seamless upgrade path.

Select Grid® View
G2 Grid® for Load Balancing
Filter Grid®
Filter Grid®
Select Grid® View
Check out the G2 Grid® for the top Load Balancing products. G2 scores products and sellers based on reviews gathered from our user community, as well as data aggregated from online sources and social networks. Together, these scores are mapped on our proprietary G2 Grid®, which you can use to compare products, streamline the buying process, and quickly identify the best products based on the experiences of your peers.
High Performers
AWS Elastic Load Balancing
BIG-IP Cloud Edition
Google Cloud Load Balancing
Azure Load Balancer
Azure Traffic Manager
Micro Focus Silk Performer
Citrix ADC
Charles Proxy
Market Presence

Learn More About Load Balancing

What is Load Balancing Software?

Load balancing software is designed to allow websites and applications to run, unfaltering, through hundreds, thousands, and even millions of simultaneous connections. By considering numerous rules, methods, and conditions, load balancing solutions work to ensure no servers within a server cluster or server pool become overloaded.

Traffic makes load balancing necessary. As servers experience higher traffic, response times can begin to slow down, resulting in a worse end-user experience. Also, continuous strain on servers can cause permanent hardware damage, meaning downtime might lead to hardware repair or replacement costs (in addition to other downtime-related revenue losses). Load balancing helps to mitigate the likelihood of these issues, acting as a gatekeeper for incoming server connection requests to ensure no single server or server pool gets overloaded.

Because server failures can still happen even with load balancing in place, most solutions will either offer backup solutions in conjunction with load balancing or they’ll be designed to integrate with backup solutions seamlessly. This is an extra layer of protection for companies’ server stacks and data.

Key Benefits of Load Balancing Software

  • Distributes server load equally across a server pool
  • Scales server use and balancing with demand
  • Ensures connection performance and reliability

Why Use Load Balancing Software?

The higher the traffic coming into a company’s website, applications, or servers, the more beneficial it is for the company to have some sort of load balancing solution in place.

Smooth Functionality — This is the reason load balancing software exists. By equally distributing server load over several members of the server pool, load balancing solutions create smoother functionality in server access, webpage loading, and application interactions.

Dynamics — Load balancing software is built for handling dynamic needs. Low traffic time? Connections are handled only by the servers that are absolutely necessary to have online dealing with requests. Influx of high traffic? Bring servers online to help handle the stress and equally distribute the incoming connections so that end-user experiences are all fluid and without disruption.

End-User Satisfaction — Nothing drives end users away from your website or application quite like having a bad user experience. Slow loading, slow responses, and page failures can dissuade users from returning and make your company’s employees reluctant to use your company’s own infrastructure. Load balancing solutions help smooth the overall user experience, preventing these frustrations.

Who Uses Load Balancing Software?

Load balancing software will be used mainly by server administrators and IT teams that get involved with server traffic handling. Because the software is specifically focused on mitigating server traffic, load balancing solutions don’t have much use outside these teams.

Kinds of Load Balancing Software

Load balancing methods focus less on specific types of software and more on specific ways to distribute traffic. The typical load distribution methods are as follows.

Random Assignment — As the name suggests, random assignment takes an incoming connection and assigns it from the client side to a server from the server pool. This distribution relies on the mathematical law of large numbers, which implies that, when a large enough volume randomly assigns values among a set, the distribution of that volume will be about equivalent.

Round Robin — In this method, every server in the server pool has its own IP address but each is uniquely linked to a master IP address for server calls. When a server call is made, that call is assigned through the master IP address to a unique server in order, yielding the "round robin" name.

Source IP Hash — IP hashing relies on the IP address from the incoming request to determine which server handles the connection. Server assignment depends on the number of servers available and rules surrounding the hash key that is generated by the IP hashing software.

Least Connection — Another self-explanatory name, the "least connection" method of load balancing takes into account the number of connections to each server as opposed to the active server workload. Incoming connections to the server pool are assigned automatically to the server with the least number of active connections.

Load Balancing Software Features

These are core features for all load balancing software.

Request Distribution — Uses one or more distribution methods to equally allocate connection requests among several servers.

Scaling — Adapts the number of servers being used for load distribution based on the amount of incoming traffic.

Additional Load Balancing Features

These features may not apply to all load balancing solutions but are offered by some.

DDoS Protection — Offers security settings to help prevent distributed denial of service (DDoS) attacks on a company’s servers.

Asymmetric Load Distribution — Allows companies to manually denote some servers to take a lesser share of the load. This is beneficial if a company is using older servers alongside newer ones or if the overall health of some servers is not as great as that of others.

Server Health Monitoring — Runs periodic checks on application servers to verify the overall functionality of each. This helps make sure that well-functioning servers take the brunt of traffic, if need be.

Potential Issues with Load Balancing Software

Asymmetric Balancing — Certain methods of load balancing can lead to an unequal distribution of traffic. IP hashing, for example, can strain certain servers over others because of the call sources for connection requests. Round robin might create undue strain on certain servers due to average connection resource consumption being higher on some servers in the list than others. Each method has the possibility of presenting with an occasional unbalancing.

Improper Scaling — Underscaling and overscaling balancing needs can create different issues. Obviously, when fewer servers are being used than are necessary, there is an overall slower end-user experience and the potential to harm physical infrastructure. When overscaled, though, more resources are being used than would be required, which can cause energy waste.