Picture of Jonas Sannewald
Jonas Sannewald
Nobody likes redundancies
For this reason, I show my apps and projects on this website mainly with pictures. If you need more information about the app or the project, you can find a detailed description on the App Store or on GitHub - the information there is always up-to-date.
Swift
Java
JavaScript
PHP
TypeScript
HTML
CSS
ZSHELL (zsh)
You can hire me 🙌🏻 (Bachelor of Science in computer science with distinction: 1.2). Just contact me and describe your project as detailed as possible. While I prefer the above languages/technologies, I am open to other modern technologies as well. Please also describe your integrated frameworks and other dependencies, because these are crucial for me to accept projects. Although I develop software in other areas, I currently focus on server-side Swift and app development (macOS, iOS, iPadOS, watchOS, tvOS) using Swift and Xcode.
My Blog
Latest Articles
Because I live in Germany, some articles are not written in English. But don't worry, you can easily translate them with DeepL. An overview of all my articles is available here: blog.sannewald.com.
My Projects
Latest Activities
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Contributions in the last year
714 total
14 Jul 2024 – 15 Jul 2025
Longest streak
18 days
8 Jun 2025 – 25 Jun 2025
Current streak
0 days
Last contributed on 11 Jul 2025
Stalking? Social research? Anyway, you can track my latest activities on Gitstalk.
macOS App
Timezone Flags
Coworkers or friends abroad? Just take a look at the menu bar of your Mac and you get the local time!
App Store
Main window Dark mode Search feature Add item with single flag Add item with multiple flags Same flag types in menu bar Different flag types in menu bar Flag alternatives in menu bar 12 hours and 24 hours format Optional details
App Icon
This app is developed exclusively by me in my leisure time. There is no company with monetization intention behind this app, so it can be offered for free. The development of updates depends heavily on how much time I can spend besides my jobs, studies, and other hobbies.
Safari App Extension
URL Detector
Annoyed that Safari only recognizes URLs with "http://" and "https://"? URL Detector extends Safari to detect all URLs on any web page!
App Store
Main window Dark mode All features Example with space Example without scheme Example with wrong scheme Example without server Popover with information Warning for wrong URLs Copy all URLs feature
App Icon
This app is developed exclusively by me in my leisure time. There is no company with monetization intention behind this app, so it can be offered for free. The development of updates depends heavily on how much time I can spend besides my jobs, studies, and other hobbies.
iOS App
TrashMail.com
Manage your TrashMails from everywhere in the world. The app implements all functionalities of the TrashMail.com backend.
App Store
Dark mode Search feature TrashMail details 1 TrashMail details 2 iOS14 widget Overview tab 1 Overview tab 2 User tab 1 User tab 2 Settings tab
App Icon
I developed this app as part of my activities as a working student. Please contact Aionda GmbH for pricing and support. Any updates after 28 February 2022 were not performed by me. Since this date, I am no longer responsible for the development of the app.
macOS App
CalendarShare
Need a better way to find appointments with others? Export your available, occupied, or both time slots in just seconds.
App Store
Dark mode Export to clipboard Export to mail app Export as txt file Content of txt file Export as ics file Import ics file to calendar Delete events feature
App Icon
I developed this app as part of my activities as a working student. Please contact Aionda GmbH for pricing and support. Any updates after 28 February 2022 were not performed by me. Since this date, I am no longer responsible for the development of the app.
App
Coming Soon
Xcode App Icon Xcode
// The next app is already in the pipeline 🙌🏻
// But there is still a lot to do...
for i in 0..<∞ {
    print("TODO: Feature Request #\(i)")
}
// Unfortunately, it's !false 😉
Contact
Feedback? Need Help?
🤘🏻
One more thing...
I offer all my software for free (except software I have developed for external companies). If you use my software and want to support me, you can donate a small amount via PayPal. However, I would be happier if you help sustainably. Emergency services (e.g. Fire Departments and Emergency Medical Services) are always looking for volunteers. Neither money nor time? No problem, then just be tolerant.