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ReadyAPI Performance vs k6 Open Source comparison

 

Comparison Buyer's Guide

Executive SummaryUpdated on Jan 6, 2025

Review summaries and opinions

We asked business professionals to review the solutions they use. Here are some excerpts of what they said:
 

Categories and Ranking

k6 Open Source
Ranking in Load Testing Tools
9th
Average Rating
7.6
Reviews Sentiment
7.9
Number of Reviews
2
Ranking in other categories
Regression Testing Tools (10th)
ReadyAPI Performance
Ranking in Load Testing Tools
11th
Average Rating
8.0
Reviews Sentiment
6.8
Number of Reviews
8
Ranking in other categories
Performance Testing Tools (10th)
 

Mindshare comparison

As of May 2025, in the Load Testing Tools category, the mindshare of k6 Open Source is 3.9%, up from 1.2% compared to the previous year. The mindshare of ReadyAPI Performance is 1.4%, up from 0.9% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Load Testing Tools
 

Featured Reviews

NalinGoonawardana - PeerSpot reviewer
Offers good scalability and has the ability to integrate with various systems and services
One area where k6 could improve is by introducing a GUI similar to JMeter. While k6 is a powerful tool for performance testing, it leans heavily towards coding. Having a GUI, even if it is a low-code approach, could make it more accessible to a broader audience. It would be beneficial to strike a balance where basic tasks can be performed graphically through a user-friendly interface, while still allowing the flexibility for more complex operations through code, similar to how JMeter operates. This could enhance the user experience and make k6 more approachable for those who may not be as comfortable with scripting.
Mahendra Andhale - PeerSpot reviewer
Open-source and flexible but needs client-side scripting
It's an open-source tool and supports a lot of plugins and custom code, which allows integration with other tools like Azure and AWS. Also, the APIs tested with SoapUI can be directly used, avoiding the need to create collections like in Postman. The client-side scripting, if incorporated, would provide a complete solution for performance tests. It can handle user distribution and transaction throughput distribution effectively.

Quotes from Members

We asked business professionals to review the solutions they use. Here are some excerpts of what they said:
 

Pros

"The tool's big advantage is that it is more performance-test oriented for experienced testers who know what they are doing. In a normal working setup, performance engineers frequently work with DevOps and development teams. For these teams, k6 Open Source's syntax is much simpler and easier to understand and apply in the working process."
"The standout feature of k6 is its strong focus on API performance testing."
"ReadyAPI automation can help us validate the functionality of most web services, allowing us to find out the exact number of defects before deployment to the user interface."
"It stores good reports, as in, improved reports if compared with the SoapUI. It also has in-built security. You just need to switch and check the security testing. My team has never used it, but I know ReadyAPI provides those facilities as well."
"he initial deployment process is easy."
"It's an open-source tool and supports a lot of plugins and custom code, which allows integration with other tools like Azure and AWS."
"The performance and reporting of this solution have been its most valuable features."
"We find the product to be scalable."
"It's like a centralized interface that allows us to increase the quality of our APIs."
"We can scale."
 

Cons

"One area where k6 could improve is by introducing a GUI similar to JMeter."
"I want the solution to be able to monitor Apache Kafka activity as well."
"This solution could be improved by offering artificial AI testing in addition to API testing. For example, we would like to have machine learning testing because when test applications, manual work could be completed automatically using this functionality."
"We need some time to understand and configure the solution."
"The solution’s interface could be improved."
"This is an area for improvement with the tool. We unnecessarily use JMeter for some website testing, which we would like to avoid by introducing this tool for API and load testing because it provides load testing features."
"It is very slow sometimes."
"I'd not sure if they have the same level of documentation for performance and security testing."
"The client-side scripting mostly isn't needed for performance testing, however, if implemented, it would enhance the tool."
 

Pricing and Cost Advice

Information not available
"ReadyAPI Performance’s pricing is reasonable."
"This solution operates on a licence basis and the usage and cost varies according to the use case. It is more expensive if you include access to the learning center. On average it costs approximately 800 Euros."
"We find the cost to be affordable."
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Top Industries

By visitors reading reviews
Computer Software Company
21%
Financial Services Firm
11%
Manufacturing Company
10%
Media Company
8%
Financial Services Firm
25%
Government
10%
Manufacturing Company
8%
Insurance Company
8%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
No data available
 

Questions from the Community

What do you like most about k6 Open Source?
The standout feature of k6 is its strong focus on API performance testing.
What needs improvement with k6 Open Source?
One area where k6 could improve is by introducing a GUI similar to JMeter. While k6 is a powerful tool for performance testing, it leans heavily towards coding. Having a GUI, even if it is a low-co...
What is your primary use case for k6 Open Source?
k6 Open Source is a powerful tool, especially for API-level performance testing. Its integration capabilities and ease of use make it promising for a wider audience.
What do you like most about ReadyAPI Performance?
It's like a centralized interface that allows us to increase the quality of our APIs.
What is your experience regarding pricing and costs for ReadyAPI Performance?
Load UI is mostly free, and the pricing for the pro version is very affordable compared to other tools like LoadRunner.
What needs improvement with ReadyAPI Performance?
The client-side scripting mostly isn't needed for performance testing, however, if implemented, it would enhance the tool.
 

Also Known As

Load Impact
LoadUI NG Pro
 

Overview

 

Sample Customers

rackspace, salesforce.com, IBM, servicenow, Nasdaq, JWT
Mercedes-Benz, Adobe, Hilton Hotels, The Home Depot
Find out what your peers are saying about ReadyAPI Performance vs. k6 Open Source and other solutions. Updated: April 2025.
850,028 professionals have used our research since 2012.