Tandem

The challenge

Client

Our own product

Industry

Personal apps

Location

Kazakhstan

Year

2026

Our role

Idea, design, development

Build an app for a couple that lives on the phone like a native one, works offline and reliably protects personal data - without publishing it in the App Store.

What we built

• Mood check-ins and topics that close with a written resolution
• Recurring tasks and letters to the future
• Food diary with a barcode scanner
• Offline mode, push and Telegram notifications
• Supabase with row-level security (RLS) and database verification scripts
• Interface in three languages

Technologies

• React 19
• Vite
• Tailwind 4
• TanStack Query
• Supabase
• PWA
• Web Push

Services involved

• Mobile apps (PWA)
• Web apps and CRM
• UI/UX design
• Trilingual websites

Related articles

• September 28, 2026 · 4 min read

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