Fourteen apps. Ninety days. One system.

I'm Evgeny — I build focused, useful apps for iPhone, iPad and Mac, and I write about how.

Browse the apps How I build them
10
apps live on the App Store
14
built in ninety days, Q1 2026
30+
languages per app

EXAM PREP

Study for a real licence.

Patente Nautica
Italy's boating licence — 1,470 official questions in 29 languages, offline, synced via iCloud.
Exam prep iPhone · iPad · Mac
Quiz Patente
Italy's driving-licence theory test, question by question.
Exam prep
CSCS Card Quiz
The UK construction-site health, safety and environment test.
Exam prep
CCSE 2026 Study Guide
Spain's constitutional and cultural knowledge test for citizenship.
Exam prep
Fischerprüfung Bayern 2026
The Bavarian fishing-licence exam.
Exam prep
Citizenship Test Germany 2026
The Einbürgerungstest, with the current official question set.
Exam prep
French Civic Exam Quiz 2026
France's civic knowledge exam for residency and citizenship.
Exam prep

UTILITIES

Small tools that do one job.

Wattora
Track energy use and cost, offline, on every device.
Utility
eXpense — Money Tracker
Expenses without a subscription or an account.
Utility
Interval Timer — Focus & HIIT
Focus sessions and interval training, one timer.
Utility
Tempus Time — Work Hours Log
Log working hours and export them, nothing else.
Utility

Four more are built and in review. All apps on the App Store →

HOW I BUILD

The system behind the speed.

Fourteen apps in ninety days wasn't speed for its own sake — it was a system. Using Claude Code as the primary development tool: 45-minute focused sessions (94% success rate across 297 tracked sessions), structured context saves that give the model persistent memory between sessions, one shared Swift package behind every app for analytics, crash reporting and monetisation, and pre-flight checklists that cut App Store rejections in half.

922 commits, 14 apps, 3 months. I build the apps and the system that builds them.

The workflow on GitHub

SUPPORT

Something not working?

Write to eg@techconcepts.org with the app name and your device. I reply within a day. Each app's privacy policy is linked from its App Store page.