Just a few little things...

Berlin Live transit map with real-time bus, tram, and train departures pinned to stops
Berlin Live
Real-time public transit map for Berlin. See live bus, tram, U-Bahn, and S-Bahn departures pinned directly to stops on the map — find the next ride home at a glance.
EdSearch visual canvas with educational videos and articles arranged around a search query
EdSearch
Visual discovery tool for educational content. Search any topic and explore related videos, articles, and resources arranged on a connected canvas instead of a flat list of links.
Chronoscope history explorer showing the Byzantine Empire and connected historical figures
Chronoscope
Browse history through interconnected events, people, and empires. Click any node to see its place in the timeline and read the linked Wikipedia article in a side panel.
Spanish vocabulary trainer showing the word la bolsa with German translation
Spanisch Vokabeln
German-to-Spanish vocabulary trainer organized by school class and unit. Daily "word of the moment" surfaces vocabulary from your decks, and a clean review interface keeps practice focused.
AI flashcard app with illustrated cards and spaced repetition
AI FlashCards
AI-powered flashcard maker that turns any topic into a study deck. Built-in spaced repetition helps students memorize vocabulary, definitions, and key facts. Works on desktop and mobile for studying anywhere.
Interactive timeline of AI history with people, products, and organizations
Timeline
Build interactive timelines for history projects and presentations. Add events, group them by era or category, and filter by date range. Export the finished timeline as a PDF poster or share it as a link.
Printable maze puzzle with start and finish markers
Maze Generator
Generate printable mazes for kids in four difficulty levels. Each maze comes with a themed shape and a solution page. Perfect for early learning worksheets, brain teasers, and rainy-day activities.
Word search puzzle — letter grid with hidden words to find
Word Search
Create printable word search puzzles in seconds. Pick a topic or paste your own vocabulary list and get a word find puzzle ready for print. Great for spelling practice, ESL lessons, and classroom activities.
Crossword puzzle generator — example grid with across and down clues
Crossword Generator
Free online crossword puzzle maker for teachers. Enter any topic and AI generates words, clues, and a ready-to-print crossword grid. Export as PDF for classroom worksheets and homework.

Aleksey Kolupaev — technology leader based in Berlin. Over a decade of CTO experience scaling startups and building engineering teams. These days I vibecode small tools for educators on the side.