Features: • Sound perception self-checks and simple charts • Spectrum analyzer and recorded spectrum • Speech listening activities and audio attention exercises • Chart export (image, PDF) • Firebase-backed account and fair-use limits This app is intended for wellness and educational use. It is not a medical device and does not diagnose, treat, cure, or prevent any disease or hearing condition. For medical concerns, consult a qualified healthcare professional. Use headphones when the app recommends it.