The short answer
A snore app helps describe the night. A sleep study helps answer a clinical question.
The value of consumer recording is organisation: what was captured, when it happened, whether it repeated and what the recording could not measure.
Snore recording app
A phone app may capture sound, event timing and user-entered notes. With permission, some apps can place wearable movement, sleep timing or wellness context beside the recording. Results depend on phone position, room noise, coverage and the app's methods.
Home sleep apnoea test
A home test may record breathing-related signals such as airflow, breathing effort, oxygen saturation, pulse, position or snoring, depending on the device and pathway. A trained service selects, checks and interprets the test.
Laboratory sleep study
A laboratory study can record a wider set of physiological signals under a clinical protocol. The appropriate test depends on the concern, health history and professional assessment.