Apps by Stefan Hollekamp

Vintage Clock Screensaver – turning idle time into watch time

Vintage Clock Screensaver turns your Mac into an elegant clock – with a vintage-inspired analog watchface (“Classic Clock”) and a modern digital flip-clock design. Perfect for multi-monitor setups, studios, offices, or as a stylish always-on display on your desk.

Two looks, one screensaver

• Classic Clock: Analog watchface with clean typography, date, time zone, weather, sunrise/sunset, moon phase, and optional zodiac / constellation details.
• FlipClock: Modern flip clock with 2D and 3D rendering engines, smooth animations, and highly legible digits.

Classic Clock in detail

• 12- or 24-hour time, plus UTC mode for developers and remote teams
• Multiple time zones – ideal when you work with clients or collaborators around the world
• Date with weekday, using your macOS region and locale (e.g. 26/11 vs 11/26)
• Weather integration with location, temperature (°C/°F), conditions, sunrise/sunset, and moon phase
• Zodiac and astronomy: current sign, optional constellations and subtle animated stars
• Refined visuals: light/dark themes, custom accent and background colors, “radium” glow details, smooth high-quality hand animations

FlipClock in detail

• Choose between a crisp SwiftUI 2D engine and a Metal-accelerated SceneKit 3D engine
• 12- or 24-hour format, optional seconds
• UTC mode, time-zone abbreviation, and location label
• Full date below the clock, automatically formatted to your region
• Scales from small to huge – works on MacBook, ultra-wide, or large studio displays
• Realistic flip animations, adjustable shadows and brightness, optional subtle flip sounds

Built for multi-display setups

• Use every display with its own configuration
• Different time zones and locations per screen
• Modes for All displays, Main only, External only, or Custom selection
• Layouts tuned for ultra-wide, side-by-side, or stacked monitor arrangements

Performance and power

• Low-power mode with reduced frame rate when running on battery
• Optional reduction of non-essential animations to save energy
• Smooth 60 FPS animations when plugged in, depending on your Mac

The app in the Mac App Store

This macOS app installs and manages the included FlipClock screensaver on your system:

• Guided installation of the screensaver
• Simple configuration for Classic Clock and FlipClock
• Info view with version details and update information

Whether you use it as a studio clock, office companion, or simply a beautiful screen to look at while you work: Vintage Clock Screensaver brings a carefully crafted, customizable, and fully native macOS clock screensaver to your Mac.

DriveBar keeps every external SSD, USB drive, hub, and dock visible at a glance.

The lightweight menu bar app shows every connected device with real-time link speed, power, and cable quality hints, so you instantly know whether your gear performs as promised. Plug drives into different ports and see the negotiated USB or Thunderbolt speed update live right in the menu bar.

Speed & cable quality insight

• Reads the actual negotiated USB or Thunderbolt speed (USB2 480 Mb/s up to Thunderbolt 40 Gb/s)
• Highlights slow or mis-wired cables, adapters, and ports before they ruin a transfer
• Use it while hot-swapping ports to confirm the fastest path for your external SSDs

All your external volumes

• Lists every mounted external volume with size information directly under the device
• Filters internal system volumes, simulators, and helper mounts to keep the overview clean
• Gives one-click access to open a volume in Finder or reveal it quickly

Clean before you unplug

• Removes hidden .DS_Store files on demand to keep shared drives tidy
• Combines cleanup and eject in a single action for client deliveries
• Ideal when handing drives to Windows or Linux users who do not want metadata clutter

Safe eject with feedback

• Safe-eject volumes right from the menu bar, optionally with confirmation
• Warns you when a process still uses the disk and can retry with a forced eject
• Shows a discrete notification once an eject succeeds, so you know it is safe to unplug

Made for the menu bar

• Lives entirely in the menu bar with a compact, information-dense layout
• Optional colored status icons provide at-a-glance hints for drive state and link quality
• Launch at login and stay out of the way – no windows cluttering your desktop

Privacy & sandbox

• Uses Apple’s system APIs and sandbox to inspect only connected storage devices and mounted volumes
• No analytics, accounts, or external data transfer – everything stays on your Mac

If you rely on external SSDs, USB sticks, Thunderbolt docks, or pro media drives, DriveBar is the tiny utility that keeps performance, cleanup, and safe eject only one click away.

CursorX keeps your cursor where it matters when a dialog appears.

This lightweight menu bar app detects system and app dialogs and moves your mouse to the default or cancel button, so you can confirm or dismiss with a single click instead of hunting across the screen.

Save time and effort

• No more long mouse movements to reach Save, OK, or Cancel
• Cursor jumps directly to the active button – one click and done
• Reduces repetitive arm and wrist movement throughout the day

Smart dialog targeting (including Adobe)

• Improved Photoshop and Illustrator Save-button detection
• Cloud/toolbar false matches are reduced with context-aware filtering
• Reliable fallback logic when default/cancel attributes are missing

App filter modes

• Exclude: CursorX runs everywhere except listed apps
• Whitelist only: CursorX runs only in listed apps
• One shared app list for both modes

Keyboard shortcut

• Global toggle shortcut: Cmd+Shift+X
• Shortcut is customizable in Settings
• Shown in the menu and Settings for quick reference

Custom button words

• Add your own words for better app-specific detection
• Includes extra consent keywords like agree to, agree &, and i agree
• Checks both AX title and AX description attributes for broader compatibility

Cursor effect

When the cursor reaches its target, CursorX can show a short visual effect so you always know where it is.

• Three effect types: Shrink & Bounce, Ripple, Color Flash
• Configurable duration, size, and color
• Effect appears shortly after the cursor arrives

Special support for Apple apps

For Mail, TextEdit, and Notes, CursorX can move the cursor into the text field instead of a button.

• Mail: Reply/compose flow → cursor into the message body
• TextEdit: New window → cursor into the editor
• Notes: New note → cursor into the editor

More options

• Choose target button: default (OK, Save) or cancel
• Configurable delay (0–3 seconds) before movement
• Optional return to original cursor position after clicking
• Optional launch at login

MenuBarCalc – the calculator that lives where you work

No more switching apps or hunting for the Calculator. MenuBarCalc sits in your macOS menu bar and is always one click (or keyboard shortcut) away. Just open it and start typing.

Why MenuBarCalc?

MenuBarCalc is designed for people who calculate all day – developers, students, engineers, creatives – and don’t want to break their workflow just to crunch a number.

Key features

• Instant access via the macOS menu bar – no app switching
• Supports basic math, advanced functions, and constants like π and e
• Full calculation history: review, copy, or export as CSV
• Optional floating window for side-by-side work
• iCloud sync so your history is available on all your Macs
• Keyboard navigation: use ↑/↓ to insert previous results
• Modern, native macOS design with customizable accent colors
• Privacy first: no data leaves your device unless you use iCloud

Perfect for

Students, engineers, developers, finance, and anyone who needs quick calculations without leaving their current app or breaking focus.

Open, type, press Return – that’s it. MenuBarCalc makes math on your Mac effortless.

SyncTaskBar – the to-do app that gets out of your way

Tired of task apps that feel more like work than help? SyncTaskBar is built for speed, simplicity, and staying focused. No accounts, no clutter – just the fastest way to capture what matters.

Whether you’re commuting, working, or brainstorming on the go, SyncTaskBar is always ready. With a single tap, you can create, organize, and complete tasks in seconds.

Core features on iOS

• Tap to add & edit – capture your thoughts instantly
• Drag & drop to reorder tasks with intuitive gestures
• Optional reminders with alarms shown clearly under each task
• Color customization so you can pick a theme that feels right
• iCloud sync to keep your list in sync across your Apple devices
• Minimal interface – no forced fields, tags, or complex views

Designed for less noise

SyncTaskBar is built for people who want to capture and check off tasks without being overwhelmed by features. Whether it’s a quick reminder or a simple list for the day, this app focuses on speed and clarity.

It’s the to-do app for those who want control – without distractions.

Smart GreenScreen is a cross-platform Chroma Key app with tracking markers and high-resolution PNG export for professional VFX and film production.

It instantly replaces any chosen background color with another hue and can overlay precise tracking markers for camera work. Run it on macOS in windowed or fullscreen mode, or take it on set with the fullscreen iOS version when you need a portable keyed backdrop for video production, livestreaming, video conferencing, or camera tracking.

Greenscreen / Chroma Key

• Swap a background color (e.g. green) for any other tone in real time.
• Tune RGB and brightness independently for the background and markers.
• Choose from 25 presets when speed matters.
• "Slider for marker" toggles whether the sliders control the background or marker color.
• Press Tab to toggle the greenscreen on/off (black fill when it is off).
• Overlay PNGs with alpha to composite graphics on top of the keyed output.

PNG Export (HD to 8K + Custom)

• Export the current greenscreen scene as PNG, including markers and overlays.
• Preset sizes from HD up to 8K.
• Custom width/height input for exact pixel sizes.
• iOS export supports Share sheet (including AirDrop) and Files/iCloud save.
• macOS export uses a native save dialog.

Tracking Markers

• Four marker types: Cross (simple crosshair), Triangle (target with triangle, circles, plus), Checkerboard (circle divided into quadrants), and Circle+Cross (circle with a center cross).
• Drop up to 12 markers simultaneously and resize them between 3-25% of the screen.
• Adjust stroke width (2-12) for cross-style markers.
• Invert colors with one tap for better contrast on set.
• Add, move, and delete markers with dedicated modes; Move shows a hand icon, Delete shows a red X so you always know the active mode.
• Default marker color is black (0,0,0) on first launch to stay visible over a green background.

Overlay Workflow

• Collapsible Overlay section in Settings.
• Base overlay image with transparency: Load and Remove controls.
• Import additional floating PNG overlays with alpha support.
• Position floating overlays freely like markers.
• Delete floating overlays via Delete mode, and remove the base overlay with its dedicated delete action.

Keyboard (iOS)

• Optional on-screen keyboard for blind typing on the greenscreen.
• "Show keyboard" plus "On marker tap only" makes the keyboard appear after tapping a marker and hide with Enter.
• Tab toggles the greenscreen on/off (also works with external keyboards, matching macOS behavior).
• Disable suggestions and autocorrection for a distraction-free typing area.

Opening the Menu

• macOS: Shift+Click or Cmd+M. The title bar can auto-hide when the pointer leaves the window and reappear on hover for a cleaner stage view.
• iOS: always-available three-finger tap, optional multi-tap (3-10 taps) when "Open menu with multi-tap" is enabled, plus an alternative 6-second long press.

Settings

• Settings save automatically so your setup is ready each session.
• Reset reverts every value to factory defaults.
• Collapsible sections (Colors, Marker, Overlay, Keyboard Setup, Presets, PNG Export) keep controls organized, complete with icons on sliders and action buttons.

Technical Details

• Built entirely with SwiftUI for responsive performance.
• Localized in DE, EN, ES, FR, IT, JA, PT, RU, and ZH.
• Settings persist as JSON files inside Application Support.
• macOS version supports auto-hiding title bars along with windowed and fullscreen modes.
• iOS version runs fullscreen, hides the status bar, and adapts to notches and varying screen sizes.

Target Audience

• Video production and post-production teams.
• Livestreamers needing quick chroma-key backgrounds.
• Video conferencing setups that require branded or tracked screens.
• Camera tracking workflows that depend on precise marker placement.
• Presenters who type directly on the greenscreen (especially with "on marker tap only" keyboard mode).

What's New (Recent Updates)

• PNG Export: added high-resolution export from HD to 8K plus custom pixel size input.
• iOS Export: choose between Share sheet (AirDrop etc.) and Files/iCloud export.
• macOS Export: native save dialog for fast local export workflows.
• Overlay section: now fully collapsible like other Settings categories.
• Floating overlays: import transparent PNG overlays, place them freely, and manage them with Move/Delete workflow.
• Overlay image controls: dedicated remove action added for quicker cleanup.
• Keyboard and marker UX polish: clearer modes, clearer labels, and improved Settings layout consistency.

Base64 Toolbox is a macOS utility for developers, designers, and anyone working with Base64. Encode and decode files and text directly from Finder or from any app.

Encode Files in Seconds

• Base64-encode entire files via drag & drop or right-click in Finder
• Supports images (JPG, PNG, GIF, TIFF) and other file types
• Images are displayed directly in the app for immediate checks
• Output formatted for HTML, CSS, XML, or URL (data URIs)

System-Wide Encoding

• Use macOS Services: "Base64Encode" and "Base64Decode" from the Finder context menu
• Encode or decode text directly in other apps such as TextEdit, Xcode, or VS Code
• No need to copy into the app – everything stays integrated in the system

Clear View of Encoded and Decoded Data

• Side-by-side view of encoded and decoded content
• Automatic detection and display when the data is an image
• Hexadecimal view for binary data with optional printable characters
• Ideal for debugging and analyzing Base64 structures

Simple and Fast Workflow

• Drag & drop for files
• One-click copy to clipboard
• Formatted output for HTML, CSS, XML, and URL
• Save decoded data to a file with a single click

Who Is Base64 Toolbox For?

• Developers embedding data URIs in HTML/CSS
• Designers embedding images in web pages
• Admins inspecting or editing Base64 data
• Anyone who needs a fast, clear Base64 tool

Technical Details

• Native macOS app
• Sandbox compliant
• Uses macOS Services for system-wide integration

Smart App Screensaver brings studio-quality visuals to any Mac in just a few clicks.

Install once and choose between three fully customizable scenes, each tuned for buttery-smooth playback on both Intel and Apple Silicon machines. Whether you want meditative motion, cinematic ambiance, or a design icon on your display, this app keeps every screen fresh.

Neuronal Noise

Immerse yourself in a living visualization of brain activity. Animated pulses travel across an abstract neural network for a colorful, ever-changing look.

• Adjust color palette, brightness, and animation speed for the perfect mood
• Runs lean so laptops stay cool, even during long focus sessions
• Ideal for science exhibits, mindfulness corners, or creative backdrops

Drizzle Dreams

Turn any photo into a cinematic rain scene. Layered droplets, mist, and reflections respond to your settings in real time.

• Load custom background images, from landscapes to product shots
• Control rain density, blur, and fog with intuitive sliders
• Multi-monitor aware, so every display can have its own weather

FlipClock

A faithful homage to Braun’s iconic flip clocks, rendered with a modern 3D engine for crisp typography and smooth flips.

• Switch between 12/24-hour formats, toggle AM/PM, seconds, and date
• Resize and dim the clock to match the room lighting or monitor size
• Pick your preferred language for numerals and labels

Built for long sessions

• Optimized Metal and Core Animation pipelines keep frame rates steady
• Per-display preferences let you dedicate specific scenes to specific monitors
• Low-power safeguards reduce render intensity on battery

From meditative neurons to rain-drenched photography and a timeless flip clock, Smart App Screensaver makes every idle moment look intentional.

Explore the sky like never before – with sound.

UAP Whistle is a professional-grade tone generator created for researchers, skywatchers, and audio explorers. Inspired by viral concepts and built with precision, this tool allows you to generate ultra-specific frequencies, fine-tune tones, and share your experiments with the world.

Whether you’re observing the night sky, testing sound systems, or experimenting with audio frequencies, UAP Whistle gives you full control and high accuracy.

Features

• Generate exact tones (e.g. 7,438 Hz) with real-time frequency control
• Fine-tune and mix multiple tones independently
• Visual tone feedback via oscilloscope-style display
• Record your audio sessions for review or sharing
• Save, load, and share your tone settings across devices
• Export tones as audio files and loop them on any system
• Connect with a growing community of skywatchers

More than just a sound toy – UAP Whistle is a research tool for curious minds. Use it, test it, report your findings – and maybe even help uncover something extraordinary.