Sonic Wave is a speaker tester and stereo tester app designed for iPhone users. With this app, you can easily adjust the tone frequency by swiping your finger up and down, ensuring clear sound output from your speaker. Additionally, you can test your phone's decibel levels and hertz with a simple click, making it a handy utility for audio enthusiasts.

The app offers subscription options, including a weekly subscription priced at $2.99 and a monthly subscription at $7.99. Users should note that pricing may vary in different countries, and charges will be converted to the local currency. Subscriptions auto-renew unless canceled 24 hours before the current period ends. Users have the flexibility to manage their subscriptions through their iTunes account settings.