AR Kalka

Place a reference image over your camera preview and trace it onto paper. Your drawing surface and the reference appear together on the display. AR Kalka does not project an image onto the paper. Secure your phone or tablet above the drawing surface. The app shows you how to mount it, including with things you already have at home. Choose a pattern or import your own image. Move, rotate and resize the overlay to fit. Adjust its opacity so you can see both the reference and the paper. Use outline mode with adjustable detail, line width and color, a grid and the camera light where your device has one. Touch lock prevents accidental movement. Projects and image settings are saved on your device. After you mark its four corners, the app can track a flat drawing surface. Tracking needs visible detail and good lighting. If the app loses the surface, it hides the overlay and lets you align it again. The phone still needs a stable mount. Try every drawing tool free with ten patterns and save one project with each of them. The full version lets you import your own images, use the complete library of 100 included patterns and save multiple projects. It is a one-time purchase with no subscription or advertising. Google Play shows the current price before you buy. Your images and projects stay on your device. The drawing tools do not need an internet connection or an AR Kalka account. Purchases and restores go through Google Play and need an internet connection. To restore, you need the same Google account you used for the purchase. The app does not provide cloud backup, so keep a separate copy of important source images. AR Kalka runs on phones and tablets, and the interface is available in 15 languages.