Tectra Systems

Home of programmer John Spahr's computer-related creations!

Welcome to my site!


About Me

Hi, I'm John! I began seriously programming back when I was in 6th grade, and I have worked with many different languages and platforms over the years. I started with C# but I have also spent a lot of time working with Kotlin, Java, Visual Basic, Swift, and JavaScript. I have used these programming skills to write apps for all sorts of platforms, old and new. These include Android, iOS, Windows, Wear OS, Palm OS, webOS, BlackBerry OS, and Windows Mobile!

My hobbies include programming, tinkering with computers, reading, writing blog posts, and spending time with my cats.

Social Stuff

 GitHub  YouTube john [at] tectrasystems [dot] org

What's happening...


This Just In!

Violoncello for iOS is finally here and available for download worldwide on the App Store! It features an intuitive user interface, tons of features, and plenty of customization options. Enjoy!

 Check it out!

Some of my main projects...

Violoncello logo


A powerful text-based browser with lots of features and a sleek user interface. Available for iOS, Android, and Windows, Violoncello can run on all sorts of devices!

 iOS  Android  Windows

Compliment Moi logo

Compliment Moi

A fun app that takes a photo of you and gives you a compliment! You can choose from different compliment lists to keep things interesting.

 iOS  Android  Pebble

TaskNudge logo


Set a single, short-term task for yourself and get reminders every few minutes to complete it. If you have trouble remembering to do a quick task or have difficulty staying focused, you'll likely find TaskNudge helpful!


LifeBoard logo


Meet LifeBoard, your own personal bulletin board! Create quick notes, categorize them, and get stuff done.


PreBook logo


A Facebook progressive web app for Palm/HP webOS that still works today!

 webOS  GitHub Repository

binoc logo


Start something with an image, quote, and intention for yourself.


 More Software

 Jump to top

© John Spahr 2021