Huge expansion: your pocket polyglot gym now carries 6,000 vocabulary cards, 19 study languages, and 342 translation directions.

ENRURO is Language HIIT: an offline vocabulary gym for your brain.
HIIT = High-Intensity Interval Training.

Not a slow course. Not a noisy app that keeps begging for attention. A short, focused vocabulary workout where your brain actually sweats:
• Offline learning with an accessible local library
• No account
• No ads
• No notifications
• No content subscriptions; optional tips are entirely up to you
• One-time purchase for lifetime access to the expanded deck

Inside: 6,000 carefully prepared vocabulary flashcards across 19 study languages: English, Russian, Romanian, Spanish, French, Brazilian Portuguese, German, Italian, Filipino, Dutch, Polish, Swedish, Norwegian Bokmål, Danish, Japanese, Korean, Traditional Chinese (Taiwan), Simplified Chinese, and Traditional Chinese (Hong Kong). Choose from 342 translation directions and train the pairs that matter to you.

Real-life vocabulary. Real brain training. Make your brain sweat — with respect for your own pace.

THE LANGUAGE HIIT IDEA
Linear courses are useful when you start from zero. ENRURO works differently: it mixes CEFR A1–C2 levels like high-intensity interval training for memory.
• A1–A2 = warm-up
• B1–B2 = working sets
• C1–C2 = tough reps with idioms, subtle meaning, and false friends
• This creates the right mental load

HOW IT WORKS
• Try to translate each flashcard yourself; don’t rush to flip it
• Read the example; semantic links help memory work harder
• Be honest with yourself: choose “Learn” or “Know”
• Use Undo if you make a mistake
• Move at your own pace

Simplicity here is not poverty — it is discipline. Nothing gets in your way. Just the card, memory, and an honest decision.
There is no AI to help or interfere with your workout. That is intentional: the effect comes through personal effort. Your desire and self-discipline are the core of your training.

GALLERY — 70 MASCOTS
The mascot is inspired by my cat Jeeves, a Russian Blue. Inside the app, he became Enruro — a quiet companion for a little emotional support.
In the Library section, there is a button where you can see the real-life prototype.
The mascot wears national costumes with recognizable symbols and offers visual tributes to remarkable people from different countries. The collection lives in the Gallery.
For the first 100 cards you learn, a new image unlocks every 10 cards. After that, one new mascot unlocks for every 100 cards you learn.
The collection can feature only a small fraction of humanity’s remarkable figures, but I wanted it to show how different people are, how brilliant they can be, and how much we can build together in the future.

A personal note: I believe people on our planet can be friends and communicate, and language barriers should be overcome. With this app, I want to contribute at least a little to mutual understanding between different peoples. When you have learned all 6,000 cards, the most important image unlocks in the Gallery — one that represents the shared destiny of all humanity 🌍.

Why there is no voiceover (TTS): I deliberately did not add speech synthesis because ENRURO is offline-first: it should work anywhere, without internet, and stay lightweight.
If I ever decide to add TTS, it will be a separate app or an optional setting.

ENRURO is a personal project by a solo developer. I gave it everything I could, and I truly hope it will be useful, pleasant, and not boring.

Respectfully,
Andrei

Andrei Enruro

Additional Information