# Locust vs Selenium

**Leader by Vioscale score:** Selenium

| Attribute | Locust | Selenium |
|---|---|---|
| **Vioscale score** | 60.6 (43% (low)) | 67.6 (76% (high)) |
| activity.commits_last_30d | 36 | 95 |
| adoption.dependent_repos | 1,883 | - |
| adoption.github_stars | 28,103 | 34,397 |
| adoption.package_downloads_weekly | - | 13,857,103 |
| deployment.options | `{"self_hosted":true}` | `{"self_hosted":true}` |
| description.long | A Python-based tool for performance testing that simulates thousands of concurrent users to stress-test web applications. Tests are written as plain Python code and can run distributed across multiple machines. | Open-source tool that automates web browsers to enable automated testing of web applications, regression testing, and automation of repetitive web-based administrative tasks. Includes WebDriver for robust test automation, IDE for record-and-playback scripting, and Grid for distributed test execution. |
| features.capabilities | `{"languages":"Python","parallel_execution":true}` | `{"languages":"Java, JavaScript, Python, Ruby, .NET","ci_integration":true,"browser_automation":true,"parallel_execution":true}` |
| integrations.count | - | 5 |
| integrations.list | - | `[{"name":"Chrome"},{"name":"Firefox"},{"name":"Edge"},{"name":"Appium"},{"name":"Chrome for Testing (CfT)"}]` |
| language.primary | Python | Java |
| license.spdx | MIT | Apache-2.0 |
| market.availability | - | `{"primaryMarkets":[],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` |
| platform.support | `{"cli":true}` | `{"cli":true,"mac":true,"linux":true,"windows":true}` |
| pricing | `{"type":"open_source","freeTier":true,"sourceUrl":"https://locust.io","retrievedAt":"2026-08-16T21:32:24.662Z"}` | `{"type":"open_source","summary":"Free and open-source (Apache 2.0 license)","freeTier":true,"sourceUrl":"https://www.selenium.dev","retrievedAt":"2026-08-14T11:07:50.782Z"}` |
| pricing.free_tier | yes | yes |
| pricing.model | commercial | open_source |
| pricing.price_level | free | free |
| pricing.transparent | yes | yes |
| release.cadence_days | 10 | 30 |
| release.history | `[{"url":"https://github.com/locustio/locust/releases/tag/2.46.4","date":"2026-08-23T11:40:06Z","type":"stable","version":"2.46.4"},{"url":"https://github.com/locustio/locust/releases/tag/2.46.3","date":"2026-08-01T10:10:38Z","type":"stable","version":"2.46.3"},{"url":"https://github.com/locustio/locust/releases/tag/2.46.2","date":"2026-07-24T19:57:38Z","type":"stable","version":"2.46.2"},{"url":"https://github.com/locustio/locust/releases/tag/2.46.1","date":"2026-07-21T18:53:03Z","type":"stable","version":"2.46.1"},{"url":"https://github.com/locustio/locust/releases/tag/2.46.0","date":"2026-07-19T14:29:10Z","type":"stable","version":"2.46.0"},{"url":"https://github.com/locustio/locust/releases/tag/2.45.0","date":"2026-07-09T08:10:23Z","type":"stable","version":"2.45.0"},{"url":"https://github.com/locustio/locust/releases/tag/2.44.4","date":"2026-06-18T12:24:58Z","type":"stable","version":"2.44.4"},{"url":"https://github.com/locustio/locust/releases/tag/2.44.3","date":"2026-06-12T10:57:24Z","type":"stable","version":"2.44.3"},{"url":"https://github.com/locustio/locust/releases/tag/2.44.2","date":"2026-06-12T10:39:49Z","type":"stable","version":"2.44.2"},{"url":"https://github.com/locustio/locust/releases/tag/2.44.1","date":"2026-06-01T22:32:28Z","type":"stable","version":"2.44.1"},{"url":"https://github.com/locustio/locust/releases/tag/2.44.0","date":"2026-05-11T20:31:38Z","type":"stable","version":"2.44.0"},{"url":"https://github.com/locustio/locust/releases/tag/2.43.4","date":"2026-04-01T20:32:51Z","type":"stable","version":"2.43.4"},{"url":"https://github.com/locustio/locust/releases/tag/2.43.3","date":"2026-02-12T09:46:25Z","type":"stable","version":"2.43.3"},{"url":"https://github.com/locustio/locust/releases/tag/2.43.2","date":"2026-02-01T10:45:39Z","type":"stable","version":"2.43.2"},{"url":"https://github.com/locustio/locust/releases/tag/2.43.1","date":"2026-01-12T19:21:45Z","type":"stable","version":"2.43.1"},{"url":"https://github.com/locustio/locust/releases/tag/2.43.0","date":"2025-12-30T08:49:59Z","type":"stable","version":"2.43.0"},{"url":"https://github.com/locustio/locust/releases/tag/2.42.6","date":"2025-11-29T17:31:00Z","type":"stable","version":"2.42.6"},{"url":"https://github.com/locustio/locust/releases/tag/2.42.5","date":"2025-11-20T16:28:32Z","type":"stable","version":"2.42.5"},{"url":"https://github.com/locustio/locust/releases/tag/2.42.4","date":"2025-11-20T11:27:05Z","type":"stable","version":"2.42.4"},{"url":"https://github.com/locustio/locust/releases/tag/2.42.3","date":"2025-11-15T10:32:37Z","type":"stable","version":"2.42.3"}]` | `[{"url":"https://github.com/SeleniumHQ/selenium/releases/tag/nightly","date":"2026-08-26T00:14:38Z","type":"prerelease","version":"nightly"},{"url":"https://github.com/SeleniumHQ/selenium/releases/tag/selenium-4.47.0","date":"2026-08-10T18:00:07Z","type":"stable","version":"selenium-4.47.0"},{"url":"https://github.com/SeleniumHQ/selenium/releases/tag/selenium-4.46.0","date":"2026-07-11T00:47:53Z","type":"stable","version":"selenium-4.46.0"},{"url":"https://github.com/SeleniumHQ/selenium/releases/tag/selenium-4.45.0","date":"2026-06-16T13:59:48Z","type":"stable","version":"selenium-4.45.0"},{"url":"https://github.com/SeleniumHQ/selenium/releases/tag/selenium-4.44.0","date":"2026-05-12T23:58:59Z","type":"stable","version":"selenium-4.44.0"},{"url":"https://github.com/SeleniumHQ/selenium/releases/tag/selenium-4.43.0","date":"2026-04-10T06:52:53Z","type":"stable","version":"selenium-4.43.0"},{"url":"https://github.com/SeleniumHQ/selenium/releases/tag/selenium-4.42.0","date":"2026-04-09T11:53:47Z","type":"stable","version":"selenium-4.42.0"},{"url":"https://github.com/SeleniumHQ/selenium/releases/tag/selenium-4.41.0","date":"2026-02-20T15:57:35Z","type":"stable","version":"selenium-4.41.0"},{"url":"https://github.com/SeleniumHQ/selenium/releases/tag/selenium-4.40.0","date":"2026-01-18T23:53:16Z","type":"stable","version":"selenium-4.40.0"},{"url":"https://github.com/SeleniumHQ/selenium/releases/tag/selenium-4.39.0","date":"2025-12-06T22:53:26Z","type":"stable","version":"selenium-4.39.0"},{"url":"https://github.com/SeleniumHQ/selenium/releases/tag/selenium-4.38.0","date":"2025-10-25T05:01:29Z","type":"stable","version":"selenium-4.38.0"},{"url":"https://github.com/SeleniumHQ/selenium/releases/tag/selenium-4.37.0","date":"2025-10-18T05:02:55Z","type":"stable","version":"selenium-4.37.0"},{"url":"https://github.com/SeleniumHQ/selenium/releases/tag/selenium-4.36.0","date":"2025-10-02T15:37:23Z","type":"stable","version":"selenium-4.36.0"},{"url":"https://github.com/SeleniumHQ/selenium/releases/tag/selenium-4.35.0","date":"2025-08-12T15:44:30Z","type":"stable","version":"selenium-4.35.0"},{"url":"https://github.com/SeleniumHQ/selenium/releases/tag/selenium-4.34.0","date":"2025-06-29T18:25:54Z","type":"stable","version":"selenium-4.34.0"},{"url":"https://github.com/SeleniumHQ/selenium/releases/tag/selenium-4.33.0","date":"2025-05-23T17:42:58Z","type":"stable","version":"selenium-4.33.0"},{"url":"https://github.com/SeleniumHQ/selenium/releases/tag/selenium-4.32.0","date":"2025-05-02T20:34:32Z","type":"stable","version":"selenium-4.32.0"},{"url":"https://github.com/SeleniumHQ/selenium/releases/tag/selenium-4.31.0","date":"2025-04-05T02:49:03Z","type":"stable","version":"selenium-4.31.0"},{"url":"https://github.com/SeleniumHQ/selenium/releases/tag/selenium-4.30.0","date":"2025-03-21T22:33:48Z","type":"stable","version":"selenium-4.30.0"},{"url":"https://github.com/SeleniumHQ/selenium/releases/tag/selenium-4.29.0","date":"2025-02-20T12:14:50Z","type":"stable","version":"selenium-4.29.0"}]` |
| reliability.status_page | - | yes |
| security.scorecard | 4.8 | 2.7 |
| security.vulnerabilities | `{"count":1,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=pypi&package_name=locust&per_page=100","last_12m":0,"max_severity":"MODERATE"}` | - |

## Capabilities (Testing Tools)

| Capability | Locust | Selenium |
|---|:--:|:--:|
| **Core** |  |  |
| Test types | - | - |
| Browser automation | - | ✓ |
| Built-in assertion library | - | - |
| Languages | Python | Java, JavaScript, Python, Ruby, .NET |
| **Isolation** |  |  |
| Mocking / stubbing | - | - |
| **Techniques** |  |  |
| Snapshot testing | - | - |
| **Performance** |  |  |
| Parallel execution | ✓ | ✓ |
| **Insight** |  |  |
| Code coverage | - | - |
| **DX** |  |  |
| Watch mode | - | - |
| **Ops** |  |  |
| CI integration | - | ✓ |

*Source: Vioscale. Generated 2026-09-01T17:23:54.577Z. "-" = undocumented, not absent.*