Timer IC 555 Calculator is a free Android app developed by Peter Ho. It is a basic timer IC for hobbyists and electronic engineers, used to calculate monostable and astable circuits. The app offers various features, including calculating the frequency of astable circuits, calculating component values of monostable and astable circuits, and saving component values in CSV files (Excel files).

The PRO version of the app includes additional features such as selectable preferred values of resistors and capacitors, sharing CSV files with other apps, no limitations, and no ads. The app is easy to use and provides accurate calculations for hobbyists and engineers.

For those who need support, the designated email is available. It is not appropriate to use the feedback area to ask questions, and it is not guaranteed that they will be read.

Overall, Timer IC 555 Calculator is a useful tool for hobbyists and engineers seeking to calculate monostable and astable circuits accurately and efficiently.