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.

The lightweight menu bar app detects system and app dialogs and instantly 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 the Save, OK, or Cancel button
• Cursor jumps directly to the active button – one click and you are done
• Reduces repetitive arm and wrist movements throughout the day

Cursor Effect

When the cursor reaches its target, CursorX shows 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 moves the cursor into the text field instead of a button.

• Mail: When replying → cursor into the email body
• TextEdit: New window → cursor into the editor
• Notes: New note → cursor into the editor

Excluded apps

You can exclude specific apps (e.g. System Settings, Safari) so CursorX stays inactive when you prefer.

Reliable detection

• Recognizes buttons in multiple languages (DE, EN, FR, ES, IT, NL)
• Fallback to Close button or position (right = action, left = cancel) when no default is found
• Works with standard dialogs, sheets, and typical macOS windows

More options

• Choose target button: default (OK, Save) or cancel
• Configurable delay (0–3 seconds) before movement
• Optional return to original 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 – a portable chroma key screen in your pocket

Smart GreenScreen transforms your mobile into a fully customizable chroma key screen – ideal for professionals in film, video, and virtual production environments. Whether you’re shooting on set, streaming, or creating VFX shots, this tool provides a clean and flexible backdrop in any color you choose.

Features

• Custom background color – choose green, blue, or any color you need
• Built-in VFX markers – select from commonly used markers and place them freely
• Adjust marker size and position to fit your shot
• Keyboard control – use a Bluetooth keyboard to turn the screen on/off remotely
• Minimal, full-screen output – distraction-free and optimized for filming

Smart GreenScreen is built for professionals who need a portable, reliable chroma key solution on iOS – with zero clutter, zero fuss, and maximum control. Designed for simplicity and reliability, it supports optional tracking markers, full color control, and remote toggling via Bluetooth keyboard.

Base64 Toolbox is built for convenience and speed, allowing users to streamline encoding and decoding processes without additional complexity.

Overview

Quickly Base64-encode entire files (including images such as JPGs and PNGs) with a single click from Finder, and easily format encoded images for use in CSS or web pages.

Encode or decode text directly inline within compatible applications (e.g., text editors, programming IDEs), or transfer text to the Base64 Toolbox interface to view both encoded and decoded representations side by side.

For decoding Base64-encoded data, binary data is displayed in hexadecimal, with an option to reveal any printable characters—an essential feature for reverse-engineering encoded data structures.

When decoding Base64-encoded images, the app automatically recognizes image data and displays the actual image rather than just decoded bytes.

Originally created by John Bowers as Base64Anywhere.

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.