Locust vs k6: Which Should You Choose in 2026?
Choosing between Locust and k6 comes down to understanding what each tool does best. This comparison breaks down the key differences so you can make an informed decision based on your specific needs, not marketing claims.
By Toolradar Team · Last updated February 28, 2026 · Methodology
Short on time? Here's the quick answer
We've tested both tools. Here's who should pick what:
Locust
Open-source load testing tool
Best for you if:
- • Locust is an open-source load testing tool written in Python
- • It simulates millions of users with code-based test scenarios
k6
Load testing tool for developers
Best for you if:
- • You want the higher-rated option (8.5/10 vs 7.8/10)
- • k6 is an open-source load testing tool for testing API and website performance
- • It uses JavaScript to script performance tests with developer-friendly workflows
| At a Glance |  Locust |  k6 |
|---|---|---|
Price | Free + Paid | Free + Paid |
Best For | API Tools | API Tools |
Rating | 78/100 | 85/100 |
| Feature | Locust | k6 |
|---|---|---|
| Pricing Model | Freemium | Freemium |
| Editorial Score | 78 | 85 |
| Community Rating | No ratings yet | No ratings yet |
| Total Reviews | 0 | 0 |
| Community Upvotes | 0 | 0 |
| Categories | API ToolsTesting & QA | API ToolsTesting & QA |
How Locust and k6 Compare
Locust
Open-source load testing tool
Free tier available · 78/100 score
k6
Load testing tool for developers
Free tier available · 85/100 score
Who Should Use What?
On a budget?
Both are freemium. Compare plans on their websites.
Go with: Locust
Want the highest-rated option?
Locust: 78/100. k6: 85/100.
Go with: k6
Value user reviews?
Neither has user reviews yet.
Go with: k6
3 Questions to Help You Decide
What's your budget?
Both are freemium. Pricing won't help you decide here.
What's your use case?
Both are api tools tools. Compare their specific features to decide.
How important are ratings?
k6 scores higher: 85/100 vs 78/100.
Key Takeaways
k6
- Higher score: 85/100 vs 78
- Free tier available
- Our pick for this comparison
Locust
The Bottom Line
k6 (85/100) is our pick.
Frequently Asked Questions
Is Locust or k6 better?
k6 scores 85/100 in our evaluation. Both are freemium.
What are Locust and k6 used for?
Locust: Open-source load testing tool. k6: Load testing tool for developers.
What does Locust cost vs k6?
Locust is freemium (free tier + paid plans). k6 is freemium (free tier + paid plans). Visit their websites for detailed pricing.