What Is Regression Testing? A Pre-Release Testing Checklist for Web and Mobile Apps
New release, old bugs coming back? Learn what regression testing is, how it differs from other testing types, and use this pre-release checklist to ship web and mobile apps with confidence.
Table of Contents
Quick answer: Regression testing checks that features which already worked still work after a code change, update or bug fix. It is run before every release to catch bugs that new code accidentally reintroduces. A practical approach is to test critical user flows on every release, the areas touched by the change, and a mix of real devices and browsers. QuickHire QA and testing support provides on-demand testers for regression and release testing.
Most production bugs are not in the new feature. They are in something old that the new feature quietly broke. Regression testing exists to catch exactly that.
What is the difference between regression, functional and smoke testing?
Testing type | Question it answers | When to run it |
|---|---|---|
Functional testing | Does the new feature work as specified? | When a feature is built |
Regression testing | Did the change break anything that worked before? | Before every release |
Smoke testing | Does the build basically work at all? | Right after each build or deployment |
Cross-device testing | Does it work on the devices and browsers users have? | Before releases with UI changes |
Release testing | Is this exact build ready for users? | On the final release candidate |
What should a regression test cover?
You do not need to retest everything every time. Focus on:
Critical flows: sign-up, login, search, checkout, booking and payments.
Changed areas: every screen and API touched by the release.
Connected areas: features that share code, data or components with the change.
Past bugs: issues that were fixed before and could return.
Pre-release testing checklist for web and mobile apps
Smoke test the build: app opens, pages load, login works.
Run functional tests on the new features against requirements.
Run regression tests on critical flows and changed areas.
Test on real devices: at least one recent iPhone, one Android phone and major desktop browsers.
Check forms, validation and error messages with wrong inputs.
Test slow networks and offline behaviour on mobile.
Verify emails, notifications and third-party integrations.
Confirm analytics and tracking still fire.
Log every bug with steps, expected result, actual result and screenshots.
Retest fixed bugs and sign off the release.
Should regression testing be manual or automated?
Both have a place. Automate stable, repetitive flows that run on every release, like login and checkout. Keep manual testing for new features, visual checks and edge cases that change often. Many small teams start manual, then automate the flows they test most.
How much testing do you need before a release?
Match testing to risk. A text change needs a quick smoke test. A payment or login change needs full regression on critical flows and multiple devices. If a release can affect revenue or user data, test more, not less.
What if you do not have a QA team?
Many startups rely on developers testing their own code, which misses bugs. On-demand testers fill that gap before important releases. QuickHire QA and testing support services cover bug testing, regression, functional, cross-device and release testing for web and mobile apps, with clear bug reports your developers can act on. Fixes can then be handled through on-demand technical support.
Frequently asked questions
What is regression testing in simple words?
Regression testing means rechecking features that already worked after any code change, to make sure the change did not break them.
What is the difference between regression testing and retesting?
Retesting confirms that a specific bug is fixed. Regression testing checks that the fix, or any other change, did not break other parts of the app.
How often should regression testing be done?
Before every release. The depth depends on risk: small changes need a focused check, while changes to payments, login or core flows need broader coverage.
Can regression testing be automated?
Yes. Stable, repetitive flows like login and checkout are good candidates for automation. New features and visual checks usually still need manual testing.
How much does on-demand QA testing cost?
QuickHire QA and testing support starts at ₹1,250 per hour. Fixing the bugs found is a separate engagement.
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