Loader.io VS TestZeus

Compare Loader.io VS TestZeus and see what are their differences

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Loader.io

Loader.io is a simple cloud-based load testing service

TestZeus

World's first open source vertical testing agent

Landing page //
2021-09-26

Sample test case //
2025-02-22

Testing modern web applications can be difficult, with frequent changes and complex features making it hard to keep up. That’s where Hercules comes in. Hercules is the world’s first open-source testing agent, built to handle the toughest testing tasks so you don’t have to. It turns simple, easy-to-write Gherkin steps into fully automated end to end tests—no coding skills needed. Whether you’re working with tricky platforms like Salesforce or running tests in your CI/CD pipeline, Hercules adapts to your needs and takes care of the details. With Hercules, testing becomes simple, reliable, and efficient, helping teams everywhere deliver better software.

Loader.io

Website: loader.io
Pricing URL: Official Loader.io Pricing
$ Details: -
Platforms: -
Release Date: -

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TestZeus

Website: testzeus.com
Pricing URL: Official TestZeus Pricing
$ Details: freemium
Platforms: Web
Release Date: 2024 November
Startup details
Country: India
State: Karnataka
City: Bangalore
Founder(s): Robin Gupta, Shriyansh Agnihotri
Employees: 1 - 9

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Loader.io features and specs

Ease of Use
Loader.io offers a straightforward and intuitive user interface, making it easy for users to set up and run load tests without a steep learning curve.
Quick Test Setup
With Loader.io, you can quickly set up load tests by simply verifying your website, inputting the target URL, and defining parameters such as duration and the number of clients.
Scalability
Loader.io allows you to scale your tests from a few clients to hundreds of thousands, accommodating different testing needs.
Free Tier
Loader.io offers a free tier that allows users to perform basic load testing, which is great for small projects or initial testing phases.
Integration
Loader.io integrates well with other services and CI/CD pipelines, enabling automated performance testing as part of your development workflow.

Possible disadvantages of Loader.io

Limited Test Duration
The free tier and some lower-tier plans have limitations on the duration of load tests, which might not be sufficient for testing long-running processes.
Complex Scenarios
Loader.io may not support highly complex testing scenarios out-of-the-box, such as tests requiring advanced scripting or multi-step transactions.
Resource Limitations
High concurrency and load levels may require higher-tier plans, which can become costly for larger-scale testing.
Geographic Limitations
There may be limitations on the geographical distribution of clients, which could affect tests intended to simulate traffic from varied regions.
Reporting
While Loader.io provides basic reporting, it may lack the depth and customization options offered by some other performance testing tools, such as detailed analytics and advanced visualization features.

TestZeus features and specs

UI testing
Web testing without code or maintenance

Analysis of Loader.io

Overall verdict

Yes, Loader.io is considered to be a good tool for load testing due to its ease of use, effectiveness, and robust feature set. It offers a free tier which is beneficial for smaller projects or for initial testing needs, expanding to paid plans for more intensive services.

Why this product is good

Loader.io is a useful tool for load testing your web applications. It allows developers and testers to simulate thousands of connections to an application, helping to ensure its reliability and performance under stress. It is cloud-based, simple to set up, and integrates well with various CI/CD tools. Its user-friendly interface and ability to test different scenarios make it a popular choice among many developers and organizations.

Recommended for

Startups and small businesses looking for an easy-to-use load testing tool
Development teams requiring performance testing integration within CI/CD pipelines
Organizations wanting to conduct basic to intermediate level load testing in a cost-effective manner
Projects that need to simulate user activity and web traffic to identify potential bottlenecks

Loader.io videos

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TestZeus videos

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Visual validations using AI agents

Category Popularity

0-100% (relative to Loader.io and TestZeus)

Loader.io

TestZeus

Monitoring Tools

100 100%

Monitoring Tools

0% 0

Automated Testing

0 0%

Automated Testing

100% 100

Website Testing

71 71%

Website Testing

29% 29

Developer Tools

100 100%

Developer Tools

0% 0

User comments

Share your experience with using Loader.io and TestZeus. For example, how are they different and which one is better?

Social recommendations and mentions

Based on our record, Loader.io seems to be more popular. It has been mentiond 22 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.

Loader.io mentions (22)

express server failing after high number of requests in digital ocean droplet with high configuration
I wanted to see how many requests can this server handle, so I have used loader.io and run10k requests for 15 seconds. But it seems 20% percent of request fail due to timeout, and the response time keep increasing. Source: over 2 years ago
Why everyone says PostgreSQL better then mongo?
I ran on the same hardware 5k current get requests through https://loader.io/ tool to the server with each db. Source: over 2 years ago
free-for.dev
Loader.io — Free load testing tools with limitations. - Source: dev.to / almost 3 years ago
How to stress test my website?
We put 50 servers of puppets against 50 http servers and see who wins. Ever had 10,000 in your checkout line at once? loader.io is for posers. Also what if there's 250,000 wanting to join the checkout line. Well we can scale to the moon and not handle that. I recommend a waiting room like Queue It. Source: about 3 years ago
Best Way to Benchmark Web Hosting?
I've used what you said, identical setups (with Wordpress) and some plugins: WordPress Hosting Benchmark tool and WP Performance Tester plus some runs with loader.io. Source: about 3 years ago

TestZeus mentions (0)

We have not tracked any mentions of TestZeus yet. Tracking of TestZeus recommendations started around Feb 2025.

What are some alternatives?

When comparing Loader.io and TestZeus, you can also consider the following products

Loadster - Loadster is a full-featured load testing solution for websites, web apps, and web services.

Tricentis - Tricentis Tosca is an effective end-to-end testing suite for enterprises, providing functional software testing tools.

k6 Cloud - Managed load testing service built on top of the popular open-source project k6.

Katalon - Built on the top of Selenium and Appium, Katalon Studio is a free and powerful automated testing tool for web testing, mobile testing, and API testing.

locust - An open source load testing tool written in Python.

Provar - Provar is a code-free, integrated automation testing tool for Salesforce.

Loadster vs Loader.io

Loadster vs TestZeus

Tricentis vs Loader.io

Tricentis vs TestZeus

k6 Cloud vs Loader.io