We build and ship apps people use every day
Van Lang Technologies designs, builds and operates its own mobile apps for language learning, productivity, personal finance, fitness and factory inspection. They're published on the App Store and Google Play under our company name.
See our apps Contact usApps built and published by Van Lang
Every app is designed, developed, released and supported in house, from product design and native modules to store releases and over-the-air updates.
Learning
Learn Chinese with Music & HSK
Learn Mandarin through real songs, with time-synced lyrics, pinyin, instant word meanings and HSK practice.
QuickVocab: English Vocabulary
Read English articles at your CEFR level, look up words in built-in English–Vietnamese and English–English dictionaries, and study them as flashcards.
Học Tiếng Hàn Qua Nhạc
Learn Korean through songs, with synced lyrics, romanized pronunciation, Vietnamese translations, and tap-a-word meanings with TOPIK levels.
VLReader: Highlight & Listen
Offline reader for PDF, EPUB, Office, FB2 and CBZ, with highlights, a notebook for each document, Markdown export and read-aloud.
Productivity & lifestyle
Hourly Chime: Custom Interval
A chime at your chosen interval during the active hours and weekdays you set. Works on phones and watches, with no ads.
VLPlay: Practice Video Player
All-format video player built on libVLC, with A-B repeat, slow-down to 0.25×, mirror mode and bookmarks with notes for practice.
Fit Penguin
Turns workouts into a game: 1,300+ exercises with step-by-step instructions and looping form animations, queued into your own sessions.
Lịch Vạn Niên Chữ To
Vietnamese lunar calendar in large type, designed for older users, with good-day and auspicious-hour lookups and read-aloud.
Mochi Pop: Puzzle Journey
Casual block puzzle with a 40-level Journey mode, in-app purchases and rewarded ads. Game logic ships over the air.
Finance & business
Phân tích Kỹ thuật
Stock technical analysis for Vietnamese investors: interactive charts, RSI, MACD and Bollinger Bands, AI-assisted forecasts and watchlists.
VL Expense
Offline expense tracker with monthly budgets and a daily safe-to-spend amount. On Android it can capture transactions from bank notifications automatically.
Checksheet HB
Equipment inspection app for maintenance teams and factories. It replaces paper checksheets with digital checks verified by GPS location and on-site photos.
One small team, one shared product platform
Our apps share a common stack and release pipeline. That lets a small team ship new products and updates quickly while keeping them reliable on both platforms.
Cross-platform apps
React Native / Expo with custom native modules (libVLC, notification listeners, speech), shipping to iOS and Android from one codebase.
Over-the-air updates
JS and content updates reach users within hours without store resubmission. Native changes go through versioned runtimes.
Offline-first & private
Most of our apps work fully offline and keep user data on the device. No account is required.
Cloud & edge
APIs, content and AI features run on serverless and edge infrastructure, including Cloudflare Workers.
Products for factories and financial services
Our team comes from manufacturing, banking and payments. We turn that domain knowledge into software products like Checksheet HB, and into tailored deployments for industrial and financial customers.
Factory operations
Digital checksheets, production progress, quality (NCR/CAPA), maintenance with MTBF/MTTR, inventory and traceability.
IoT & computer vision
Sensor, meter and PLC data via gateways (MQTT, Modbus, OPC-UA), live dashboards, and vision-based defect inspection.
Fintech platforms
Digital lending, payments and e-wallets, credit information, API gateways, fraud and AML data, all built for audit and high availability.
Builders with deep domain experience
Engineers and advisors with backgrounds in banking, payments, automotive, industrial equipment and EPC engineering.
Lê Hữu Trí
Full-stack and cloud (AWS Certified SA). Builds and ships the company's apps; previously worked on e-wallets, payment gateways, blockchain, smart city and computer vision.
Bùi Văn Kiên
PMP. 15+ years across mechanical engineering, production management and IT, covering banking, payments, securities and credit information systems.
Nguyễn Đình Liệu
12+ years in embedded, IoT, AUTOSAR/ASPICE automotive ECUs, industrial metrology and computer vision.
Trần Đức Cường
15 years on LNG, refining and petrochemical EPC projects. His pipe stress automation tools are used across JGC group companies.
Nguyễn Văn Dương
Mission-critical trading, payments and AML/fraud platforms, with a focus on high availability, performance and cloud scaling.
Phạm Đức Thành
Former CTO in fintech and payments. Advises on platform architecture and engineering leadership.
Get in touch
For product support, partnerships or business enquiries:
GitHub
Office
No. 9, Alley 1/34/1 Phan Dinh Giot Street, Phuong Liet Ward, Hanoi, Vietnam