We craft mobile apps people open every day

Arpi Labs is an independent studio making its own mobile products.

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Our apps

WordsUp

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WordsUp
English vocabulary trainer

A vocabulary learning app for Russian-speaking learners of English. A spaced-repetition algorithm adapts to how you actually remember, so every session is spent on the words that need it most.

Thousands of words in curated thematic packs, custom words with automatic translation and transcription, exercises, streaks, and detailed progress stats.

Spaced repetition Curated word packs Progress & rewards Works offline

Available on Android

WordsUp home screen
How we build

Everything in-house

Mobile development

Our apps are built with modern cross-platform tooling — they start fast, work offline, and keep improving with every release.

Product design

Interfaces designed around platform conventions and real usage: clear navigation, careful typography, delightful details. The people who design are the same people who build.

Backend & infrastructure

APIs, payments, analytics, and over-the-air updates — the invisible machinery that keeps our apps reliable at scale.

Contact

Let's talk

Questions about our apps, feedback, or support — we read everything and reply personally.

arpilabs@gmail.com