ACalcM is an advanced calculator app developed by ACCESS K.K. It is an extended version of ACalc, offering a unique list feature where numbers and operators used in calculations are stored and can be edited individually. Users can swipe buttons to change their positions, enhancing ease of use.

The app includes in-app purchases for iPhone users to remove ads, activate the "multifunctional" mode, and customize designs. New functions like the % button and single-digit delete button have been added, along with design customization options. ACalcM also offers features like memory function for complex calculations, row insert function for detailed editing, e-mail function for sharing results, and a rounding function for precision in calculations.