You can unlock the Premium version of the app using the Unlock Premium action from the action menu.

The Premium access is granted to the account, not the device. You can use it on any device with the same account.

The Premium version offers you the following features:

No ads.
Full screen with a translucent navigation bar (Android 5.0+) and using the camera cutout area (Android 9+).
Unlimited access to built-in fractal types.
Unlimited access to built-in paint modes.
Unlimited access to image filters.
Creating any number of custom fractal types and paint modes (limited to one custom fractal and one custom paint mode in the free version).
Rotating and stretching the image for all fractal types (available only for Mandelbrot Set in the free version).
Julia mode for all fractal types that support it (available for only for Mandelbrot Set in the free version).
Rendering and saving images with a custom resolution up to 4k (limited to your device screen resolution in the free version). This is an experimental feature. On Android versions earlier than 7.0, the resolution is limited to 2k (or the device screen resolution if it is higher).
Supersampling (smoother image at the cost of slower rendering).
Premium built-in spots in the gallery.
Transfering custom content to another device.

Thank you for supporting MandelBrowser.