Sumigi: Learn Accounting

Accounting quiz application with ~700 questions, topics, and answer PDFs; designed for CPA/CFA exam preparation and deepening knowledge in finance and accounting.

Ray.Exam PDD is a simple and convenient application for preparing for the traffic police examination.

Mobile app for learning English from scratch, based on grammar, vocabulary, listening, and interactive exercises including trainer and detective stories. Free basic version with optional paid subscription.

An app for parallel reading of books in two languages (original + translation) with built-in translator, dictionary, and voice playback support for learning foreign languages through natural reading.

An app for learning foreign languages through gamified mini-lessons with flashcards, illustrations and audio, supporting 55+ languages, but frequently experiencing bugs with subscription synchronization, audio and performance.

Premium VPN is more than a standard free VPN—a fast service without ads for YouTube and social networks in Russia.

App with 2500+ lectures on culture, history, science and other topics, featuring memorization techniques (tests, quizzes, gamification) and offline access, but with stability, support and refund issues.

Water intake tracking app with reminder system, game characters, and Apple Health integration; core functionality is free, but many additional features require a paid subscription.