Cherkalka is a three-in-one app that combines note-taking, photo editing, and action extension capabilities. Designed for iPhone users, this app is a great tool for quickly jotting down notes or sketching on photos without the need to launch a heavy notepad application.

The app includes a built-in photo editor that allows users to make notes directly on photos right from the Photos app, eliminating the need to switch between multiple apps. Additionally, Cherkalka offers an action extension feature, which enables users to handle pictures from any app that supports this functionality and easily share the results. It's worth noting that not all apps are compatible with receiving the edited image after pressing the Done button, but the photo editor within Cherkalka can be used in such cases.

Cherkalka offers a range of features, including the ability to draw and erase, adjust the width and color of the pencil as well as the note, share created pictures, utilize existing photos, store and duplicate notes, and even eliminate palm touches when using a stylus. The full version of the app provides additional features such as resizing notes, moving and rotating layers of strokes and background, scaling the current note view, changing the width and color of the pencil in the photo editor and extension, syncing notes via iCloud, and the option to exclude the app logo on exported pictures.