- First launch and stability
- Launch time, splash and loading screens, onboarding, crashes and freezes.
- Core features
- Whether they work and give the right answer, checked against your expected results where provided.
- Navigation
- Tabs, menus, the Back button, returning to the app after leaving it.
- Layout
- Cut-off text, overlapping controls, content under the status or navigation bar.
- Data and progress
- Whether progress, settings and sign-in survive closing and reopening.
- Language and region
- Wrong-language text, currency, dates and time zones for UK users.
- Accessibility
- Screen-reader labels, obvious contrast problems, tap target size.
- Ads, permissions and security
- Test ads left live, ads easily tapped by mistake, unexplained permission prompts, exposed sensitive data.