How many devices were used for testing?

The number of devices for testing depends on the context of the task and the project requirements. Usually, to ensure good test coverage, a variety of devices are selected based on the following criteria:

• Different operating systems (iOS, Android, Windows, macOS, etc.)
• Different OS versions
• Different models and manufacturers (to account for hardware differences)
• Different screen sizes and resolutions

For example, for a mobile application, 5-10 devices often suffice, covering the main platforms and versions. Emulators and simulators are sometimes used to extend coverage.

If the question pertains to a specific project, the exact number of devices should be determined based on an analysis of the target audience and quality requirements.