We build the apps
we use ourselves

Cut, merge, rearrange and split PDFs on macOS — locally.

Native PDFKit-based app. Drag pages, multi-select, rotate, split, merge — files never leave your Mac.

Keep your Mac awake — for exactly as long as you need.

Menu-bar app that prevents sleep and the screen saver. Pick a duration, work in peace; when the timer runs out your Mac returns to its normal energy settings.

Smart hydration tracker that adapts to weather and activity.

Calculates your daily hydration goal from weather and activity data, then nudges gently — no streaks, no guilt, no account required. Trinki Pro (one-time purchase) adds the Apple Watch app, widgets, and Apple Health.

Digital receipt & reimbursement tracker for German private health insurance.

OCR scanner for receipts, automatic categorisation, reimbursement tracking — built around the PKV / Beihilfe workflow. 100% offline. Free for the first 10 receipts; one-time IAP unlocks unlimited.

Roll the dice on dinner — recipe shuffler for indecisive cooks.

Add what you'd actually eat, roll the dice, settle the dinner debate in seconds. Stop scrolling, start cooking.

Local pollen forecast paired with an allergy symptom diary.

Hyper-local pollen forecast plus a daily symptom log so you can spot which species actually affects you.

Voucher and gift-card manager — never let one expire.

Track gift-cards and vouchers with balance, expiry date, and reminders before they lapse.

Mechanical watch accuracy logger and rate tracker.

Log daily rates for your mechanical watches, see drift trends over time, compare across your collection.

Tennis rules explained the way they're actually played.

60 club-court scenarios — serves, scoring, doubles, line calls — in 3–5 minute sessions with animated court diagrams. Fully offline, English and German.

Quitting smoking starts in your head.

Psychological support while you quit: the KLAR path walks you through 22 beliefs in four phases, and when a craving hits, the SOS mode has breathing and reappraisal ready. Everything stays on your iPhone. Free to start, Full Access is a one-time purchase.

A noir mystery you solve by typing.

Every case hands you a few threads and a fictional terminal. You enter commands and draw your conclusions from what people left behind. The cases are written by hand, not generated. The prologue is free; every further case is a single purchase.

Crack one intercepted message a day.

At midnight a fresh cryptogram is waiting, and behind it sits the next chapter of an espionage story told season by season. A puzzle takes two to four minutes. The daily puzzle stays free; the Field Kit is a one-time purchase that unlocks the archive and unlimited practice.