About
About Budling: Free English Vocabulary Flashcards, Built Solo
Budling is built and maintained by one developer, with AI tools as a coding co-pilot for everything from the spaced-repetition scheduler to the pixel-art pet renderer. No team, no funding round — just a solo builder who wanted a flashcard app worth opening every day, and shipped it as a free, ad-free study tool for anyone learning English vocabulary.
What you get
One app, four ways to study English
Flashcards + spaced repetition
The FSRS algorithm schedules every card right before you'd forget it — no cramming, no wasted review time.
Pixel pet companion
Hatch an egg, then evolve it through five stages by studying. Miss a day and it gets grumpy.
Live head-to-head sessions
Study against a friend in real time — same deck, same clock, whoever knows more wins.
Free vocabulary library
90+ expert-curated sets across CEFR A1–C2, plus a full English grammar reference. No account required to browse.
Found a bug, have an idea, or just want to say hi? Get in touch.