lœrn
Offline flashcards for your own learning material. Bring in content from wherever it is useful — including AI tools of your choice — without making a built-in AI service part of lœrn's ongoing costs.
Focused software.
Fair by design.
Jetzt & Dahanna is an independent one-person software studio. We build small, thoughtful applications with clear purposes — and use technology only where it makes the product better.
Small software, deliberately made
We start with what a product actually needs. Sometimes that means an on-device solution, sometimes an external service — and often it means keeping things simpler. The result should be useful, understandable, and straightforward to run and price.
sudøku
A clean Sudoku experience with fresh puzzles generated directly on your device, useful local statistics, and an interface designed around solving.
Technology with restraint
Sometimes the right technology is AI. Sometimes it is an on-device algorithm. Sometimes the best decision is not to add another service at all. We choose based on what makes the product useful, understandable, and sustainable.