Ghoul Fluids vs Doodle Spark

A spooky, glowing liquid light show! Ghoul Fluids is an interactive camera effect that turns people into swirling, spectral energy. Using Jos Stam's stable fluid simulation and image segmentation, the app detects your movement in real-time and pushes digital "dye" around the screen, creating a mesmerizing, ghostly trail that follows you. Perfect for: Halloween Displays: Connect your iPad to a TV or projector to create a haunted mirror that reacts to Trick-or-Treaters (they won't care though). Parties: Set it up in a corner and watch guests play with their digital silhouettes. Visual Art: Create trippy, responsive visuals just by waving your hands. Features: Real-Time Simulation: Smooth, shader implemented fluid dynamics that react instantly to your motion. Camera-Screen Mode: See the real world with the simulation to tune your setup perfectly. Privacy First: Everything runs locally on your device. No video is ever recorded or sent to the cloud.

Doodle Spark is the perfect drawing app for little ones. With just a touch, toddlers can paint rainbow trails across the screen, tap to burst colorful fireworks, and watch their creations glow and sparkle. Designed from the ground up for young children — no menus, no ads, no distractions. Just a clean black canvas and endless color. Settings for parents stay out of the way behind a faint gear that only opens when it's pressed and held. Built-in Guided Access support lets parents lock the screen to Doodle Spark with a triple-click, so little hands stay safe and the fun never gets interrupted. Features: Rainbow brushstrokes that follow every finger Tap anywhere to burst a colorful firework Smooth glowing strokes that gently fade away Draw with up to 5 fingers at once Works in any orientation — turn the device and the drawing stays put Guided Access ready — lock to the app in seconds No ads, no accounts, no subscriptions, and no internet needed to draw Doodle Spark Plus (optional one-time purchase): Draw & Save mode keeps drawings on screen so you can save them to Photos Pick a single line color or keep the rainbow Choose the line thickness Plus is offered only in the parent settings, and buying it needs a parental check. Can be shared with your family through Family Sharing Doodle Spark is designed to be completely distraction-free. There are no pop-ups, no notifications, and nothing to accidentally navigate away from. Just hand it to your toddler and let their imagination run wild.