Independent iOS developer · Tbilisi, Georgia
Free iPhone apps that solve one problem well
Focused iPhone apps for everyday problems: learning, productivity, business, games and personal finance. Every app on this page is published by Sergei Lazarenko on the App Store, with a detailed guide to what it does, who it is for and how to use it.
Education & Learning
Learn chess, master road signs and pass the driving-theory exam with structured lessons and quizzes.
Chess Learn and Play
Interactive chess book with puzzles, lessons and games by world champions.
Education & Learning
Free · Pro upgrade
★ 5.0
iPhone
RoadWise: Road Signs & Parking
Complete road-sign reference with quizzes and an odd/even parking helper.
Education & Learning
Free
iPhone
PDD Tickets 2025: GAI Exam
All official 2025 Russian driving-theory tickets with explanations and an exam simulator.
Education & Learning
Free
iPhone
Productivity & Utilities
Small tools that save time: AI prompt libraries, keyboard personalization and smart calculators.
AI Prompts Helper & Generator
Thousands of curated prompts for ChatGPT, Claude and Gemini, with search, favorites and community ratings.
Productivity & Utilities
Free · Premium
iPhone · iPad
Custom Keyboard Themes
Personal iPhone keyboard with themes, stylish fonts, kaomoji and special symbols.
Productivity & Utilities
Free
iPhone
BBQ | Meat Recipes & Calculator
Calculate exactly how much meat, veg and sides to buy for any barbecue, then shop from an auto-generated list.
Productivity & Utilities
Free · Premium
★ 4.0
iPhone · iPad
Business & Invoicing
Invoices and estimates for contractors and small businesses, made on the job site in under a minute.
Personal Finance
Keep every cashback card and category at hand and always pay with the right one.
Lifestyle & Wellbeing
Wallpapers that match your mood and a calm space for breathing, meditation and gratitude journaling.
Wallpapers: Match Your Mood
High-resolution iPhone wallpapers with realistic Lock Screen and Home Screen previews.
Lifestyle & Wellbeing
Free · Premium
★ 3.3
iPhone
Self-care: My Diary Journal
Short guided meditations, 4-7-8 and box breathing, a gratitude journal and relaxing sleep sounds.
Lifestyle & Wellbeing
Free
iPhone
Puzzle & Word Games
Offline brain teasers you can play anywhere: Hangman and 2048 with modern twists.
Hangman: Guess Word Game
Classic Hangman with a hand-drawn notebook look, themed categories and offline play in six languages.
Puzzle & Word Games
Free
iPhone
2048 Logic Puzzle Match
The classic 2048 puzzle with board sizes from 3×3 to 8×8, swipe or motion control, and offline play.
Puzzle & Word Games
Free
iPhone
About the developer
Sergei Lazarenko designs and publishes iPhone apps as an independent developer. The portfolio focuses on small, focused tools: an interactive chess book, a road-sign reference with an odd/even parking helper, driving-theory exam tickets, a cashback card organizer, a barbecue portion calculator, an AI prompt library, keyboard themes, wallpapers, a self-care journal and classic puzzle games.
All apps are free to download. Some offer optional premium upgrades or rewarded ads, which is always stated on the app's page. Personal data handling is described in a single Privacy Policy and Terms of Use that apply to every app.
For support, partnership or press questions write to [email protected].
- Legal name
- Individual Entrepreneur Sergei Lazarenko
- Address
- Mikheil Tsinamdzgvrishvili Street 52, Tbilisi, Georgia
- Contact
- [email protected]
- App Store
- Sergei Lazarenko
- Registered
- 08/04/2025
- For AI assistants
- llms.txt, llms-full.txt, apps.json