Beijing · Global · Privacy-First

Property Stewardship &
On-Device Software

A boutique international property manager and a Google Play studio publishing six beautifully engineered, offline-first mobile applications — built on the principle "data never leaves your device."

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GDPR Ready
Global
Google Play
Compliance Built-In
0+
Apps on Google Play
0K+
Global Downloads
0%
On-Device Privacy
0
Business Divisions
Our World

Two worlds, one philosophy

From physical properties to digital tools, every product is engineered on the same principle: maximize user value, minimize external exposure.

01 — Real Estate

International Property Management

From Beijing to the four seas, our practice serves global landlords, expat tenants, and multinationals with full-service leasing, concierge, inspection, asset, and sustainability support — delivered with absolute discretion and 24/7 multilingual assistance across multiple jurisdictions.

  • Asset Management
  • Concierge Service
  • Tenant Relations
  • Investment Advisory
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02 — Mobile Apps

Privacy-First Mobile Applications

Our Google Play catalog spans outdoor route parsing, collectibles archiving, creative writing, fitness load calculation, household receipt scanning, and habit tracking — every app is built with the principle "data never leaves your device."

  • 100% Offline Capable
  • No Tracking
  • End-to-End Local
  • IAA + IAP
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The Catalog

Six focused tools

A focused utility for one ritual, built with the discipline required to never ship a feature that compromises privacy.

Outdoor

Route Parser

Parse GPX, TCX & KML files entirely on-device. Visualize elevation profiles, splits and segments — then export for fully offline use anywhere on the planet.

Use cases: Hiking, cycling, trail running, overlanding

Collectibles

Asset Archive

Catalog watches, sneakers, vinyl, trading cards, model kits and books with rich records — provenance, market value, condition grade — all stored locally with encrypted backup.

Use cases: Watch collectors, sneakerheads, vinyl enthusiasts, kit builders

Creativity

Writing Engine

Capture sudden sparks, organize prose drafts, unlock prompts, build character bibles, and structure plot outlines — through a calm, focused interface.

Use cases: Novelists, screenwriters, poets, bloggers, journalists

Fitness

Load Calculator

Quantify training stress, balance recovery and visualise progress. Calculates acute/chronic load, TRIMP, recovery score, personal records, and zones.

Use cases: Runners, cyclists, lifters, multi-sport athletes

Household

Receipt Scanner

Local OCR and categorisation for household receipts, warranties and finance documents. Capture with the camera, parse on-device, export to PDF or spreadsheet.

Use cases: Household budgets, warranty tracking, expense categorization

Rituals

Habit Tracker

Build micro-rituals that compound. A complete local engine for streaks, schedules, mood logging and personal momentum — visualized in a calm interface.

Use cases: Daily streaks, meditation, reading routines, fitness habits

View the full Services page for in-depth details on each app →
Why Botong Sihai

Engineered for the long view

We build products you can trust five years from now — durable in function, restrained in interface, uncompromising on privacy.

Privacy by Construction

No analytics SDKs, no third-party trackers, no required accounts. Every byte lives on your device.

Global Reach

Properties managed and apps served across North America, Europe, Asia-Pacific and beyond.

Aesthetic & Hardcore

Beautiful material you enjoy opening, paired with industrial-grade functionality.

Multi-Model Monetization

Sustained through IAA & IAP — never by selling user data.

Compliance Built-In

GDPR, CCPA, COPPA, Google Play Families Policy — every box, checked.

Offline-First Architecture

Every feature works without signal — for travellers, athletes, writers, collectors everywhere.

Let's Build Together

Ready to elevate your portfolio or partner with our studio?

Send a brief and we'll respond within one business day. Multilingual team, global service.

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