A popular Android app for high-resolution audio spectrum analysis that can help visualize frequencies at the edge of the infrasonic range. ⚠️ Important Warnings
Depending on your specific needs, here is helpful information and resources related to infrasound software: 1. Tone & Signal Generators
A free, open-source audio editor. You can use the "Generate" -> "Tone" feature to create frequencies as low as 1 Hz. It is widely considered the standard for basic frequency generation and analysis.