Testing · head to head
k6 vs Notepad++
k6
Testing
Load testing tool with JavaScript tests on a Go runtime, now owned by Grafana Labs
- From
- Free
- Rated
- -
Notepad++
Developer Tools
Free, lightweight source code and text editor for Windows
- From
- Free
- Rated
- -
The short version
- Each has a real cost: k6 tests run on a JavaScript engine embedded in Go rather than on Node.js, so npm packages, Node built-ins and existing shared test utilities generally do not work without being bundled to plain JavaScript, and often not even then.; Notepad++ windows-only, with no official native macOS or Linux build.
- They diverge on capability: k6 covers JavaScript test scripts, Notepad++ covers Syntax Highlighting.
- Prices and features above were last checked on 30 August 2026.
Where they differ
Only the attributes on which k6 and Notepad++ actually diverge.
Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated).
What each one covers
Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.
Only in k6
- JavaScript test scripts
- Thresholds and checks
- Protocol coverage
- Browser module
- Executors
- xk6 extensions
- Metrics output
- Kubernetes operator
Only in Notepad++
- Syntax Highlighting
- Tabbed Editing
- Plugin System
- Regular Expression Search
- Function List
What people use each for
The jobs each tool is most often brought in to do.
k6
- Gating a deployment pipeline on a threshold such as 95th percentile latency under a defined arrival ratenot Notepad++
- Generating tens of thousands of requests per second from a small number of machines without a load generator fleetnot Notepad++
- Testing gRPC and WebSocket services with the same tooling and thresholds used for HTTP endpointsnot Notepad++
- Correlating a load test against existing dashboards for an organisation already running Grafana and Prometheusnot Notepad++
Notepad++
- Quick editing of code and config files on Windowsnot k6
- Batch find-and-replace across multiple files with regexnot k6
- Lightweight alternative to a full IDE for scriptingnot k6
- Viewing and editing logs or large text filesnot k6
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
k6
- Tests run on a JavaScript engine embedded in Go rather than on Node.js, so npm packages, Node built-ins and existing shared test utilities generally do not work without being bundled to plain JavaScript, and often not even then.
- The open source binary runs on a single machine, so distributed load requires the Kubernetes operator or the cloud service, and the operator is infrastructure your team has to run and debug.
- The AGPL-3.0 licence on the core requires legal review at any company that intends to embed k6 in a product it distributes or offers as a service, which is a slower path than a permissively licensed tool.
- There is no result storage in the open source tool, so trend history means standing up Prometheus, InfluxDB or Grafana Cloud before load testing produces anything comparable over time.
- Since the Grafana Labs acquisition the roadmap serves the Grafana observability stack, so a buyer choosing k6 as a standalone tool should expect the standalone experience to receive less investment than the cloud and dashboard integration.
- Grafana Cloud billing is by virtual user hour, so a long soak test at modest concurrency costs far more than its peak load suggests, and cost planning has to be done in virtual user hours rather than in test runs.
Notepad++
- Windows-only, with no official native macOS or Linux build.
- Lacks built-in debugging or project/build management found in full IDEs.
- Plugin quality and maintenance varies since they are community-contributed.
- No built-in version control integration beyond what plugins provide.
Pricing, plan by plan
k6
Free- k6 OSSFree
- AGPL-3.0 licence
- Full test engine, no virtual user limits
- Runs on one machine unless distributed yourself
- Grafana Cloud free tierFree
- Includes a monthly allowance of virtual user hours
- Hosted test results and dashboards
- Shared with the rest of the Grafana Cloud free tier
- Grafana Cloud k6$undefined/month
- Billed by virtual user hours consumed
- Load generation from multiple regions
- Retained test history and comparison
Notepad++
Free- FreeFree
- Full editor and plugin ecosystem, no paid tiers
Which should you pick?
Choose k6 if
- You need javascript test scripts.
- You want to start without paying.
- You work on Windows, macOS, Linux, Docker, Kubernetes.
- You also want thresholds and checks.
Choose Notepad++ if
- You need syntax highlighting.
- You want to start without paying.
- You work on windows.
- You also want tabbed editing.
Questions people ask
- Is k6 or Notepad++ better?
- Neither clearly leads. k6 starts at Free and Notepad++ at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, k6 or Notepad++?
- k6 starts at Free and Notepad++ at Free.
- Does k6 or Notepad++ run on more platforms?
- k6 runs on Windows, macOS, Linux, Docker, Kubernetes. Notepad++ runs on windows.
- Can I use k6 for free?
- Both have a free tier, so you can try either at no cost before committing.
- What is k6 best used for?
- k6 is most often used for gating a deployment pipeline on a threshold such as 95th percentile latency under a defined arrival rate, generating tens of thousands of requests per second from a small number of machines without a load generator fleet, testing grpc and websocket services with the same tooling and thresholds used for http endpoints, correlating a load test against existing dashboards for an organisation already running grafana and prometheus. Of those, gating a deployment pipeline on a threshold such as 95th percentile latency under a defined arrival rate and generating tens of thousands of requests per second from a small number of machines without a load generator fleet are not what Notepad++ is typically brought in for.
- What can k6 do that Notepad++ cannot?
- k6 covers JavaScript test scripts, Thresholds and checks, Protocol coverage, Browser module. Notepad++ covers Syntax Highlighting, Tabbed Editing, Plugin System, Regular Expression Search.
Answered from the vendors’ own pages
k6: Can I use npm packages in a k6 test?
Usually not. Scripts run on a Go-embedded JavaScript engine with no Node.js runtime, so packages depending on Node built-ins fail and pure JavaScript libraries must be bundled first.
Notepad++: Is Notepad++ free?
Yes, Notepad++ is free and open-source software distributed under the GNU General Public License, with no paid tiers.
Sourcek6: Is k6 free?
The core tool is free under AGPL-3.0 with no virtual user limits. Grafana Cloud k6 is a paid service billed by virtual user hours, with a free monthly allowance.
Notepad++: What license does Notepad++ use?
Notepad++ is licensed under the GNU General Public License v2.0 (GPLv2), meaning its source code is freely available and modifiable under GPL terms.
Sourcek6: Does the Grafana acquisition affect the open source tool?
The tool remains open source and maintained, but investment is directed at making it a data source for Grafana, so standalone use is supported rather than prioritised.
Notepad++: Which operating systems does Notepad++ support?
Notepad++ runs exclusively on Microsoft Windows; there is no official native build for macOS or Linux.
Sourcek6: Can k6 replace a browser testing tool?
No. The browser module measures page-level metrics under load, but functional browser testing belongs in Playwright or a similar tool.
Notepad++: How do I install plugins in Notepad++?
Plugins are installed and managed through the built-in Plugins Admin (plugin manager), which lists community plugins available for download and update.
SourceNotepad++: Where can I get help or documentation for Notepad++?
Official documentation is at the User Manual site, and community support is available through the Notepad++ community forum and GitHub issue tracker.
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