Procedure checker is this app for Standard Operating Procedures (SOP app). Procedure checker prevents unfinished work or careless mistakes by doing daily routine from housekeeping to work as follows. 1. Record daily routine procedures 2. Perform each step of the procedure and check the step with checklist 3. Correct a more efficient procedure Using the procedure checker has the following advantages. · Prevent unfinished work or careless mistakes · Improve the routine's way of doing it efficiently · Not tired because it is not necessary to determine the procedure