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1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minuteSanity testing commonly means a quick, narrow check that a changed build or feature is coherent enough for deeper testing. Regression testing checks whether a change has introduced or exposed defects in software that was not changed. The key difference is the question each test answers—not a fixed test count or mandatory sequence. “Sanity testing” is used inconsistently across teams, while the regression-testing purpose is defined in the ISTQB glossary.
What is the difference between sanity testing and regression testing?
| Aspect | Sanity testing (common usage) | Regression testing |
|---|---|---|
| Main question | Does the changed build or area seem functional enough to continue testing? | Did the change cause defects in behavior that was not changed? |
| Scope | Usually narrow and quick, often centered on a recent change; the team defines the scope. | Selected existing tests, ranging from targeted checks to broad coverage, based on risk and impact. |
| Typical trigger | A new build, fix, or change needing an initial check. | A software, configuration, or data change that could affect existing behavior. |
| Outcome | A decision about whether deeper testing is worthwhile. | Evidence that important existing behavior still works after the change. |
| Execution | Often manual, but may be automated. | Manual or automated; automation can make repeated checks faster and more repeatable. |
The sanity-testing column describes common industry usage, not a universal ISTQB category or prescribed process. Teams should state what their “sanity check” covers rather than assume everyone uses the term the same way.
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When should I use sanity testing?
Use a sanity check when a changed build or feature needs a fast initial assessment before spending time on deeper testing. Keep it focused on the relevant change and the basic conditions needed to proceed. For example, after a small update to a sign-in page, a team might check that the page loads and that the changed sign-in interaction works before running a broader test plan.
A passing sanity check is not evidence that unrelated features still work. It is a gate for deciding whether to continue, not a substitute for regression coverage. Because scope is team-defined, record which checks are included and what a pass means in your process.
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When should I use regression testing?
Run regression tests after a software, configuration, or data change that could affect existing processes. The goal is to detect defects introduced or uncovered in unchanged areas. ISTQB defines regression testing as change-related testing aimed at finding those defects; Microsoft Learn recommends considering it after relevant changes and before a production change.
Regression testing can be manual or automated. It is not limited to the changed feature: choose existing tests that provide evidence about the behavior at risk. A test that checks only the new or fixed behavior may be useful, but that alone does not establish that neighboring or dependent behavior remains intact.
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How do confirmation testing and regression testing differ?
Confirmation testing checks whether a specific reported defect was fixed, typically by repeating the steps that reproduced it. Regression testing checks for collateral defects in unchanged areas. A fix can pass confirmation testing and still introduce a side effect elsewhere, so both purposes may matter when resolving a bug.
They are distinct test purposes even when they use the same test suite: ISTQB notes that confirmation tests can be added to an automated regression bed. See the ISTQB Test Automation Engineer syllabus.
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Is sanity testing the same as smoke testing?
There is no universal distinction established by the cited standards sources. Organizations use “sanity” and “smoke” inconsistently, and the consulted sources do not define a formal, universal boundary between them. In practice, teams may use either label for an initial check, but the reliable way to understand a process is to ask what it tests, how broad it is, and what decision follows a pass or failure.
Does regression testing retest everything?
No. Regression testing does not inherently require rerunning every test. Its scope can be broad, risk-prioritized, focused on affected areas, or a combination. Microsoft Learn describes four practical approaches:
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- Broad coverage: test nearly all processes. This offers wider coverage but costs more to run and maintain.
- Business-impact prioritization: protect the processes whose failure would matter most.
- Change-focused testing: target areas affected by the change. This takes less effort but cannot establish that unrelated areas are unaffected.
- Combined strategy: protect critical processes while increasing testing around changed features.
Choose according to risk and available test time. A change-impact assessment can help identify affected areas, but a narrowly targeted suite should not be presented as proof that every unrelated behavior is safe.
How should teams automate regression testing?
Automate progressively, beginning with high-value, frequently repeated business processes and expanding coverage as the suite and maintenance capacity grow. Microsoft’s guidance says automation can improve speed, coverage, and repeatability while reducing human-error risk. Automation is not automatically cheaper: teams still need to design, maintain, and run the tests.
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Microsoft’s Dynamics 365 tooling guidance lists options including Microsoft Playwright, Selenium, the Regression suite automation tool, and third-party tools. The right choice depends on the application, environment, test design, and ability to maintain the suite; the cited sources do not establish one universally best tool. See Microsoft Learn’s regression-testing tooling guidance.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Capture visual evidence with ScreenshotNeo
For teams whose regression checks include page appearance, ScreenshotNeo is a screenshot API that can capture a page as an image or PDF; it is a capture service, not a replacement for choosing and running regression tests. Its API can return clean screenshots after removing supported consent banners, newsletter popups, and chat widgets, which may help when those overlays would otherwise obscure the page. The steps can be turned off. Its response headers identify the page verdict and whether the shot was billed; bot checks, CAPTCHAs, blank pages, timeouts, failed loads, and cache hits are not billed.
For example, this cURL request captures a page as WebP. Replace the sample URL with the page you need to capture and set your API key:
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpSee the ScreenshotNeo API documentation for request options and response details. Other available options include full-page capture with lazy images loaded, CSS-selector element capture, dark mode, device presets or custom viewport dimensions, retina scale, PDF settings, custom CSS and JavaScript, selector or network-idle waits, request blocking, cookies and headers, timezone and geolocation, caching, signed image links, asynchronous jobs with signed webhooks, bulk capture, and a usage API. Select only the options your capture workflow needs.
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curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpCookie banners, popups, and chat widgets are removed before the shot; bot checks, blank pages, and failed loads are never billed. An MCP server provides the take_screenshot, get_page_info, and capture_pdf tools for AI agents and MCP clients. The Free plan includes 1,000 screenshots a month with no card; paid plans start at $5 for 3,000. Sign up for free.
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