그림일기장 is a free lifestyle application designed for iPhone users, allowing them to maintain a digital diary through drawings and photos. Users can easily document their daily experiences by sketching with a pen, utilizing emotion and weather stickers for added context, or capturing moments with photos. The app features a calendar view for monthly summaries of entries, enhancing organization and accessibility.

The application supports a hands-on, analog feel, ideal for those who appreciate a traditional diary experience. It is compatible with Apple Pencil for drawing, offers search functionality, and includes automatic synchronization across multiple devices, including iPad and desktop. Users can also personalize their diary by downloading stickers from the store. A free trial period of seven days is available, with a one-time purchase option for lifetime access.