# OCMP Command [GstarCAD 2027](Help%20System/GSTARCAD/2027/Index.md) → [Commands](Help%20System/GSTARCAD/2027/Commands/(Commands).md) → [O](Help%20System/GSTARCAD/2027/Commands/O/(O).md) ## Function Description: As we know the drawing compare function in GstarCAD can be used to compare similar drawings containing nearly number of drawn objects to each other, especially to compare different versions of revision drawings. Drawing compare can make comparisons between two similar drawings (Old DWG and New DWG) and generate them as separate files. After pressing "COMPARE" button within "CompareDwg" dialog box, the program will generate and open \_old and \_new. dwg files, where you can see the differences between drawings. Drawing Compare can find out differences (drawn objects) and show the result with different colors, e.g. if a line is modified, removed or newly drawn, it will be displayed in different colors. But there is something else that drawing compare could not accomplish so accurately. Drawing compare can't insert and show the compared objects on the current drawing working space that you are working at real time. Besides, drawing compare can't show the details of how the objects were located before they were modified. So the details are very important when comparing objects. Now the new and innovative Graphic Compare tool can do more. It does not only compare two drawings with similar objects geometry and find out the differences but also display the details of any change at the current workspace of your drawing in real time, e.g. if a line is modified, only the changed part of the line is displayed in different color. The unchanged part remains unchanged. The [Graphic Compare dialog box](Help%20System/GSTARCAD/2027/Commands/03%20Dialog%20Boxes/O/OCMP%20Dialog%20Box.md) is displayed. ## Command Access: > **Icon:** ![](Help%20System/GSTARCAD/2027/assets/60a015fff8afeefa5e815a0ce3ca4648350ee1abfd2622419a6ae913bf95d667.png) > **Menu:** Express > Drawing Tools > Graphic Compare > **Ribbon:** Express > Drawing > Graphic Compare > **Toolbar:** / > **Command:** OCMP > **Alias:** / **Command Prompts: /** --- **Related Tasks：** - [To Work With Express Tools (GstarCAD 2026)](../../../2026/Commands/01%20Procedures/To%20Work%20With%20Express%20Tools.md) --- [Original help](https://www.gstarcad.net/help/GstarCAD_2027_en-US/detail/commandReferences_O/OCMP.html) · © Gstarsoft Co., Ltd.