Code Testing tools — Technology data 2026 | Stack Overflow Developer Survey

Question

Which tools for code testing, reliability, and maintainability have you done extensive development work in over the past year? Which do you want to work in over the next year? If you worked with the tool and want to continue to do so, please check both boxes in that row.

scale
Optional
v2026.1

Data

	Respondents	Percent
ESLint	3,935	37.1%
Postman / Newman	3,453	32.6%
pytest	2,972	28.0%
Playwright	2,642	24.9%
JUnit	2,274	21.4%
Jest	2,205	20.8%
Vitest	2,053	19.4%
SonarQube / SonarCloud	1,990	18.8%
Sentry	1,472	13.9%
Selenium	1,272	12.0%
Datadog	1,180	11.1%
xUnit.net	1,132	10.7%
NUnit	921	8.7%
Cypress	869	8.2%
Testcontainers	827	7.8%
Other	696	6.6%
JaCoCo	635	6.0%
CodeRabbit	605	5.7%
BrowserStack	576	5.4%
Codecov	553	5.2%
Mocha	545	5.1%
CodeQL	539	5.1%
Snyk Code	538	5.1%
Cucumber	508	4.8%
k6	391	3.7%
New Relic	387	3.6%
RSpec	387	3.6%
Semgrep	252	2.4%
TestNG	240	2.3%
Robot Framework	226	2.1%
Graphite	223	2.1%
Appium	203	1.9%
Canary	162	1.5%
Greptile	130	1.2%
DeepSource	121	1.1%
Qodo	109	1.0%
PHPUnit	88	0.8%
Sourcery	88	0.8%
Ellipsis	82	0.8%
Bruno	60	0.6%
GoogleTest	56	0.5%
MSTest	47	0.4%

Use this data

Citation

Response data is released under the ODbL 1.0, which asks that you attribute it.

Stack Exchange Inc. (2026). “Code Testing tools”. Stack Overflow Developer Survey 2026. Licensed under ODbL 1.0. https://survey.stackoverflow.co/2026/technology/data/code-test

JSON

Structured for code, with the question, the year and the source url alongside the numbers.

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  "question": "Code Testing tools",
  "dataId": "CodeTest",
  "asked": "Which tools for code testing, reliability, and maintainability have you done extensive development work in over the past year? Which do you want to work in over the next year? If you worked with the tool and want to continue to do so, please check both boxes in that row.",
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      "response": "ESLint",
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    {
      "response": "Postman / Newman",
      "count": 3453,
      "pct": 0.326
    },
    {
      "response": "pytest",
      "count": 2972,
      "pct": 0.28
    },
    {
      "response": "Playwright",
      "count": 2642,
      "pct": 0.249
    },
    {
      "response": "JUnit",
      "count": 2274,
      "pct": 0.214
    },
    {
      "response": "Jest",
      "count": 2205,
      "pct": 0.208
    },
    {
      "response": "Vitest",
      "count": 2053,
      "pct": 0.194
    },
    {
      "response": "SonarQube / SonarCloud",
      "count": 1990,
      "pct": 0.188
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    {
      "response": "Sentry",
      "count": 1472,
      "pct": 0.139
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    {
      "response": "Selenium",
      "count": 1272,
      "pct": 0.12
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    {
      "response": "Datadog",
      "count": 1180,
      "pct": 0.111
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    {
      "response": "xUnit.net",
      "count": 1132,
      "pct": 0.107
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      "response": "NUnit",
      "count": 921,
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      "response": "Cypress",
      "count": 869,
      "pct": 0.082
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      "response": "Testcontainers",
      "count": 827,
      "pct": 0.078
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      "response": "Other",
      "count": 696,
      "pct": 0.066
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    {
      "response": "JaCoCo",
      "count": 635,
      "pct": 0.06
    },
    {
      "response": "CodeRabbit",
      "count": 605,
      "pct": 0.057
    },
    {
      "response": "BrowserStack",
      "count": 576,
      "pct": 0.054
    },
    {
      "response": "Codecov",
      "count": 553,
      "pct": 0.052
    },
    {
      "response": "Mocha",
      "count": 545,
      "pct": 0.051
    },
    {
      "response": "CodeQL",
      "count": 539,
      "pct": 0.051
    },
    {
      "response": "Snyk Code",
      "count": 538,
      "pct": 0.051
    },
    {
      "response": "Cucumber",
      "count": 508,
      "pct": 0.048
    },
    {
      "response": "k6",
      "count": 391,
      "pct": 0.037
    },
    {
      "response": "New Relic",
      "count": 387,
      "pct": 0.036
    },
    {
      "response": "RSpec",
      "count": 387,
      "pct": 0.036
    },
    {
      "response": "Semgrep",
      "count": 252,
      "pct": 0.024
    },
    {
      "response": "TestNG",
      "count": 240,
      "pct": 0.023
    },
    {
      "response": "Robot Framework",
      "count": 226,
      "pct": 0.021
    },
    {
      "response": "Graphite",
      "count": 223,
      "pct": 0.021
    },
    {
      "response": "Appium",
      "count": 203,
      "pct": 0.019
    },
    {
      "response": "Canary",
      "count": 162,
      "pct": 0.015
    },
    {
      "response": "Greptile",
      "count": 130,
      "pct": 0.012
    },
    {
      "response": "DeepSource",
      "count": 121,
      "pct": 0.011
    },
    {
      "response": "Qodo",
      "count": 109,
      "pct": 0.01
    },
    {
      "response": "PHPUnit",
      "count": 88,
      "pct": 0.008
    },
    {
      "response": "Sourcery",
      "count": 88,
      "pct": 0.008
    },
    {
      "response": "Ellipsis",
      "count": 82,
      "pct": 0.008
    },
    {
      "response": "Bruno",
      "count": 60,
      "pct": 0.006
    },
    {
      "response": "GoogleTest",
      "count": 56,
      "pct": 0.005
    },
    {
      "response": "MSTest",
      "count": 47,
      "pct": 0.004
    }
  ]
}

Markdown

A formatted table, ready to paste into a document, an issue or a prompt.

|  | Respondents | Percent |
| --- | ---: | ---: |
| ESLint | 3,935 | 37.1% |
| Postman / Newman | 3,453 | 32.6% |
| pytest | 2,972 | 28.0% |
| Playwright | 2,642 | 24.9% |
| JUnit | 2,274 | 21.4% |
| Jest | 2,205 | 20.8% |
| Vitest | 2,053 | 19.4% |
| SonarQube / SonarCloud | 1,990 | 18.8% |
| Sentry | 1,472 | 13.9% |
| Selenium | 1,272 | 12.0% |
| Datadog | 1,180 | 11.1% |
| xUnit.net | 1,132 | 10.7% |
| NUnit | 921 | 8.7% |
| Cypress | 869 | 8.2% |
| Testcontainers | 827 | 7.8% |
| Other | 696 | 6.6% |
| JaCoCo | 635 | 6.0% |
| CodeRabbit | 605 | 5.7% |
| BrowserStack | 576 | 5.4% |
| Codecov | 553 | 5.2% |
| Mocha | 545 | 5.1% |
| CodeQL | 539 | 5.1% |
| Snyk Code | 538 | 5.1% |
| Cucumber | 508 | 4.8% |
| k6 | 391 | 3.7% |
| New Relic | 387 | 3.6% |
| RSpec | 387 | 3.6% |
| Semgrep | 252 | 2.4% |
| TestNG | 240 | 2.3% |
| Robot Framework | 226 | 2.1% |
| Graphite | 223 | 2.1% |
| Appium | 203 | 1.9% |
| Canary | 162 | 1.5% |
| Greptile | 130 | 1.2% |
| DeepSource | 121 | 1.1% |
| Qodo | 109 | 1.0% |
| PHPUnit | 88 | 0.8% |
| Sourcery | 88 | 0.8% |
| Ellipsis | 82 | 0.8% |
| Bruno | 60 | 0.6% |
| GoogleTest | 56 | 0.5% |
| MSTest | 47 | 0.4% |

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