Stefan Oltmann

Stefan Oltmann

Building apps with Kotlin 🚀
#95098413 followers3 following
#1,739Last month
23 KP
>10,000All time
23 KP

About

Kotlin developer. Multiplatform enthusiast. Builder of practical software.

Badges

Tastemaker
Tastemaker
Gone streaking 10
Gone streaking 10
Gone streaking
Gone streaking
Gone streaking 5
Gone streaking 5

Maker History

  • PixelSafe
    PixelSafeFree open-source tool to hide data within PNG images
    Apr 2026
  • Mines+
    Mines+No guessing. Just logic. Solvable Minesweeper.
    Apr 2026
  • EXIF Viewer
    EXIF ViewerDive into image metadata, all the way down to raw hex.
    Apr 2026
  • MapsNotIncluded - ONI Seed Browser
    MapsNotIncluded - ONI Seed BrowserEasily find the best maps for Oxygen Not Included
    Apr 2026
  • Thumbnail Fixer Pro
    Thumbnail Fixer ProRepair & enhance embedded thumbnails
    Apr 2026
    • 🎉
    Joined Product HuntMarch 3rd, 2026

Forums

Stefan Oltmann•

2mo ago

Mines+ - No guessing. Just logic. Solvable Minesweeper.

Mines+ is a beautiful, fair Minesweeper game built for pure logic. Every board is solvable without guessing, so no 50/50 losses. Enjoy a clean modern design, customizable difficulty, dark and light mode, offline play, and no data collection.
Stefan Oltmann•

2mo ago

MapsNotIncluded - ONI Seed Browser - Easily find the best maps for Oxygen Not Included

The tool allows a large database of maps to be quickly searched using complex criteria, making it easy to discover interesting maps. Each map’s properties are presented in a clear and visually appealing way, enabling quick overviews and easy comparisons. It's free for everyone.
Stefan Oltmann•

1mo ago

PixelSafe - Free open-source tool to hide data within PNG images

Steganography allows you to conceal information in plain sight, making it invisible to the casual observer. With PixelSafe, you can embed any file into a screenshot, with optional encryption. Works fully offline, with all data processed locally on your device.
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