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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
7th
Average Rating
7.6
Reviews Sentiment
7.9
Number of Reviews
2
Ranking in other categories
Regression Testing Tools (9th)
ReadyAPI Performance
Ranking in Load Testing Tools
10th
Average Rating
8.0
Reviews Sentiment
6.8
Number of Reviews
8
Ranking in other categories
Performance Testing Tools (10th)
 

Mindshare comparison

As of December 2025, in the Load Testing Tools category, the mindshare of k6 Open Source is 4.5%, up from 2.9% compared to the previous year. The mindshare of ReadyAPI Performance is 2.6%, up from 1.1% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Load Testing Tools Market Share Distribution
ProductMarket Share (%)
k6 Open Source4.5%
ReadyAPI Performance2.6%
Other92.9%
Load Testing Tools
 

Featured Reviews

ArtemCheremisin - PeerSpot reviewer
Performance Test Engineer at BETBY
Lighter on the RAM and has native Grafana support
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. Recently, I had a case where I was using another tool, and there wasn't enough memory for it because it required more RAM. k6 Open Source, on the other hand, is lighter and doesn't have a UI, which is beneficial. An engineer I was training could use k6 Open Source scripts even without my help. The tool is more efficient and has native support with Grafana, as both are developed by the same company. This integration enhances monitoring and loss ratio tracking. Thanks to its intelligent GUI, k6 Open Source's design is simpler, particularly for complex scenarios. When we need to manage hundreds of thousands or millions of transactions per minute, the solution becomes a game-changer compared to JMeter.
Mahendra Andhale - PeerSpot reviewer
Test Manager at a computer software company with 1,001-5,000 employees
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."
"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."
"We find the product to be scalable."
"It's like a centralized interface that allows us to increase the quality of our APIs."
"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."
"The performance and reporting of this solution have been its most valuable features."
"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."
"We can scale."
"he initial deployment process is easy."
 

Cons

"One area where k6 could improve is by introducing a GUI similar to JMeter."
"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."
"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."
"The solution’s interface could be improved."
"I'd not sure if they have the same level of documentation for performance and security testing."
"I want the solution to be able to monitor Apache Kafka activity as well."
"The client-side scripting mostly isn't needed for performance testing, however, if implemented, it would enhance the tool."
"It is very slow sometimes."
"We need some time to understand and configure the solution."
 

Pricing and Cost Advice

Information not available
"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."
"ReadyAPI Performance’s pricing is reasonable."
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Top Industries

By visitors reading reviews
Computer Software Company
16%
Financial Services Firm
10%
Manufacturing Company
8%
Media Company
7%
Financial Services Firm
17%
Media Company
11%
Retailer
11%
Performing Arts
9%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
No data available
By reviewers
Company SizeCount
Small Business2
Midsize Enterprise1
Large Enterprise5
 

Questions from the Community

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.
What is your primary use case for ReadyAPI Performance?
The primary use case is to conduct server-side performance tests, scalability tests, and endurance tests using SoapUI and Load UI.
 

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: December 2025.
879,259 professionals have used our research since 2012.