Limed Feature DEMO of PAID SUBSCRIPTION APP
This app only lets you select frequencies in units of 10, (ex. 500, 510, 520hz) starting at around 300hz (less than that is locked out) and lots of other features are locked unless you pay for the "Pro" Version, which by "pro" means unlocking basic app functionality. I don't know if the pro version will let you select a frequency such as 213hz or if it is also limited to units of 10. I am guessing the pro version would be a good app, and I would be willing to pay a one time fee to make the app functional, but I am not willing to pay a subscription, merely to unlock basic functionality of an app. One great feature of this app developer is the data is not collected. This is something that people would be willing to pay for. But again, for most people, probably only a one time fee, rather than a subscription
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