OverPen: Draw on Screen, developed by Karaoglu Studio, provides on-device, real-time annotation for presenters and creators. The app lets users write, draw, and mark up whatever appears on the screen by using a transparent overlay that works regardless of the active application. Key controls include a floating toolbar, ARGB color selection, adjustable pen and eraser sizes, undo/redo, and a notification toggle. It targets educators, content creators, mobile presenters, and technical support professionals who need immediate visual guidance during live sessions.

OverPen enables live annotation directly over any running app

OverPen functions as an overlay drawing tool that places a transparent layer above other apps, so annotations appear without stopping the active workflow. That overlay design reverses the usual capture-then-edit pattern, allowing a draw-then-capture approach for live demonstrations, tutorials, or gameplay. This makes it practical where showing steps in real time matters, because annotations apply instantly to the visible content rather than to a static screenshot.

The drawing workflow supports fast capture and in-session edits

The app bundles drawing controls into a floating toolbar for quick access and includes an integrated screenshot tool to save annotated screens. Users can pick precise colors through ARGB support, change pen and eraser sizes, and correct strokes with undo and redo. A one-tap Clear Screen option removes all marks, which helps presenters reset visuals between explanations without leaving the active app.

The interface grants quick toggles while keeping setup simple

Access to drawing mode is available via a persistent notification toggle and the floating toolbar, so enabling or disabling annotations does not require deep navigation. OverPen does not need root access, it uses the standard display-over-other-apps permission. The color picker and size controls give fine control, a benefit for users comfortable selecting ARGB values but a modest learning step for first-time annotators.

Compatibility and performance align with mobile presentation needs

Built for Android devices, the app integrates with screen recording software to capture drawings in live video sessions and advertises a lightweight overlay that does not interfere with underlying app performance. Because it edits the live display, it avoids extra screenshot-edit cycles and fits workflows where quick visual explanation is the output. The tool suits single-device demonstrations rather than multi-user document collaboration.

OverPen suits mobile presenters who need immediate, single-device visual guidance

OverPen is a practical option for educators, creators, and support staff who require live, on-screen marking during demonstrations. One limitation is that it depends on modern Android overlay support and device compatibility, which may restrict use on older hardware. Given its design and reported reception for simplicity and utility, the app is a good match for anyone producing quick annotated tutorials or live walkthroughs on a single Android device.