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JetStream 2

Free#44 of 72 in PC Benchmark Software

JetStream 2: A focused browser benchmark with broad JavaScript and WebAssembly workload coverage. Ranked #44 of 72 in PC Benchmark Software by our editors (5.1/10); pricing: Open source; best for browser JavaScript and WebAssembly testing.

5.1/10Editor score

Visit JetStream 2

JetStream 25.1 Visit JetStream 2

At a glance

Editor score
5.1 / 10
Pricing
Open source
Best for
Browser JavaScript and WebAssembly testing
Paid from
Free
Workload areas
JavaScript, WebAssembly, Web Workers, Promises, async iteration, Unicode regular expressions, JavaScript parsing, simulations
Founded
2019
Facts checked
22 Sep 2026

Where it wins
- 64 subtests cover JavaScript, WebAssembly, workers, async, and parsing.
- A geometric-mean score provides one summary result across the suite.
- Command-line execution supports repeatable benchmark automation.
Where it doesn't
- Web-only scope limits it to browser and JavaScript-engine performance.
- It is not designed to measure general PC hardware performance.
- Scores from JetStream 2.1 and 2.2 are not comparable with other versions.

Our verdict on JetStream 2

JetStream 2 is an open-source, browser-based benchmark suite from WebKit for evaluating JavaScript and WebAssembly performance. It suits developers, browser engineers, and teams comparing browser or JavaScript-engine behavior rather than measuring general PC hardware. The suite contains 64 subtests spanning JavaScript parsing, simulations, Unicode regular expressions, Web Workers, Promises, async iteration, DataView workloads, and WebAssembly execution. Results are combined into a single score using a geometric mean, while individual tests provide more specific measurements.

Its main strength is workload depth within a narrow browser-performance focus. JetStream 2 separates startup, worst-case, and average-case JavaScript measurements, and also covers WebAssembly startup and runtime performance. That range gives buyers more than one headline number when investigating how an engine handles different execution patterns. Command-line benchmark execution adds a practical route for automation, while the web platform keeps the benchmark aligned with browser-based testing. The published deployment is cloud-based, and documentation and community channels provide the listed support options.

The trade-off is scope. JetStream 2 does not cover broad PC hardware benchmarking, and its web-only delivery makes it a specialist choice rather than a general desktop benchmark. Version discipline also matters: the unversioned URL now serves JetStream 3.0, while the official JetStream 2.2 page remains available at a versioned URL; JetStream 2.1 and 2.2 scores should not be compared with other JetStream versions. Choose JetStream 2 for browser JavaScript and WebAssembly analysis with detailed subtests and command-line execution. Choose an alternative for whole-system PC measurements or cross-version score comparisons.

Your product? Our editors can test JetStream 2 in depth and publish a review, labelled as paid · from $149/mo →

JetStream 2 pricing

Plans Open sourceFree Free to use — no paid tier required for the core job.

See plans on browserbench.org

JetStream 2 fact sheet

Free plan	Not verified
Paid from	Free
Workload areas	JavaScript, WebAssembly, Web Workers, Promises, async iteration, Unicode regular expressions, JavaScript parsing, simulations
Operating systems	Not verified
Comparison database	Not verified
Result export formats	Not verified
Custom test profiles	Not verified
CLI or automation	Yes
Deployment	Cloud
Platforms	Web
Support	Docs, Community
Pricing	Open source
Website	browserbench.org
Facts checked	22 Sep 2026

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Featured on iTechGuides

JetStream 2 is listed in our PC Benchmark Software directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

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Last updated 7 Oct 2026 · How we research and update