Dont bother

You can get an accurate calculation of your bonds at the US Treasury Website. The Treasury website is accurate easy to use and provides much more information about your bonds than the app.

I bought the app before I saw the website - dont make the same mistake.

You can do better with the US Treasury Website and not have to endure an endless flurry of useless spam like emails from the app. Bad deal in my opinion to be avoided.

Javier rover about Savings Bond Calculator