Software Design Studio & Digital Product Lab

Engineering Software That Ships.
From Zero-Knowledge Vaults to Cloud Platforms.

Treasure Island is a software design and full-stack engineering studio. We architect production web platforms, native Rust & Tauri desktop applications,Chrome Extensions trusted by thousands, and applied AI systems—shipping both our own public products and bespoke software for ambitious teams.

Explore Shipped Products ↓Discuss a Software Project →
Windows Store AppFree • Tauri + Rust
Grid Cache — Encrypted Photo Vault

apps.microsoft.com ↗

Chrome Web Store1,000+ Active Users
Ximalaya Downloader — Batch Audio

chromewebstore.google.com ↗

Chrome Web StoreFree • Google Messages
MAID — Message Aid & Archiver

chromewebstore.google.com ↗

Cloud & Agent SaaSv2 Flagship + v1 gush.email
doggy.email — Crypto & Agent Mail

doggy.email ↗

7+Live Products & Apps
1,000+Chrome Store Users
Web • Rust • AIFull-Spectrum Stack
Zero-TrustPrivacy-First Engineering

✦ From Our Product Lab

Shipped Products & Live Platforms

We don’t just design software on paper—we ship, maintain, and scale our own commercial applications across the Microsoft Store, Chrome Web Store, and global cloud edge.

apps.microsoft.com ↗Desktop App
Microsoft Store • Free App

Grid CacheZero-Knowledge Encrypted Photo Vault for Windows

A zero-knowledge, multi-partition encrypted desktop photo vault for Windows. Every visual pattern lock derives an isolated cryptographic key—there is no global master password or unencrypted index on disk.

PlatformWindows Store
EncryptionAES-256-GCM
ArchitectureZero-Knowledge
LicenseFree Download
  • Zero-knowledge multi-partition architecture where each pattern opens its own independent vault
  • Hardware-accelerated Rust cryptography (AES-256-GCM encryption + local SQLite storage)
  • Lightweight native Windows desktop footprint built on Tauri v2 and React 19
  • Published as a free native application on the official Microsoft Store
Tauri v2RustAES-256-GCMSQLiteReact 19TypeScript
Get on Microsoft Store ↗Inquire / Feedback ↓
chromewebstore.google.com ↗Chrome Extension
Chrome Web Store • Free Extension

MAID — Message AidProductivity & Archiving Suite for Google Messages

A Manifest V3 Chrome extension engineered for Google Messages (messages.google.com) that adds structured SMS/MMS archiving, smart pagination across long histories, and in-browser AMR audio playback.

PlatformChrome Web Store
Target AppGoogle Messages
Execution100% Local
PriceFree
  • Seamless integration into Google Messages web client with non-intrusive controls
  • Batch export and structured backup of SMS/MMS threads with rate-limit-aware pagination
  • Client-side AMR audio decoding and ZIP packaging for multimedia attachments
  • Strict privacy-first design—all message processing executes 100% locally in your browser
Chrome MV3TypeScriptAMR CodecJSZipPlaywright E2E
View on Chrome Web Store ↗Inquire / Feedback ↓
chromewebstore.google.com ↗Chrome Extension
Chrome Web Store • 1,000+ Users

Ximalaya DownloaderBatch Audio Album Downloader & Deduplicator

A widely adopted Chrome extension trusted by 1,000+ active users to batch-download purchased audio albums from Ximalaya with automatic page traversal and local file deduplication.

Active Users1,000+ Users
StoreChrome Web Store
DeduplicationSmart Local Scan
PriceFree
  • Trusted by over 1,000 active users on the official Chrome Web Store
  • One-click batch downloading with automatic scrolling and multi-page album pagination
  • Smart local file scanning that automatically skips previously downloaded tracks
  • Clean, intuitive React popup & side-panel UI with real-time queue progress
Chrome MV3ReactCryptoJSStream AutomationPostCSS
View on Chrome Web Store ↗Inquire / Feedback ↓
doggy.email / gush.email ↗Cloud & Web Platform
Live SaaS Platform • v2 & v1

doggy.email & gush.emailCrypto-Native Webmail & Programmatic Email for AI Agents

Full-stack cryptographic email ecosystem. Originally launched as gush.email (v1, still serving active users) and architected into doggy.email (v2)—combining passwordless wallet signature login, Cloudflare Pages SPAs, WildDuck mail microservices, and programmatic APIs for AI agents.

Flagship v2doggy.email
Legacy v1gush.email
Auth ModelWallet Signature
Agent ReadyREST & Webhooks
  • Passwordless cryptographic authentication using Bitcoin & Dogecoin wallet signatures (BIP32/BIP39/secp256k1)
  • Programmatic REST & webhook APIs enabling autonomous AI agents to send, receive, and parse email
  • Distributed architecture with Cloudflare Pages edge frontends and Express / WildDuck mail servers
  • Continuous evolution from gush.email (v1 live platform) to the upgraded doggy.email (v2 monorepo)
React 19Cloudflare PagesNode.js / ExpressWildDuck IMAPBitcoin/Dogecoin Crypto
Launch doggy.email (v2) ↗Visit gush.email (v1) ↗
backthen.photo ↗Cloud & Web Platform
Live Web App • Bilingual

Backthen Photo (想當年)Multilingual Collaborative Photo Preservation Platform

A collaborative archival platform designed for families and communities to preserve, annotate, and share vintage and milestone photographs across generations in English and Chinese.

Live URLbackthen.photo
Cloud StorageAWS S3 Presigned
AI EngineCloud Vision API
LanguagesEN / 繁體中文
  • Frictionless guest participation via Supabase Anonymous Auth and reusable invite claim links
  • Direct-to-cloud media pipeline using AWS S3 presigned URLs and client-side image optimization
  • Automated photo tagging and optical analysis powered by Google Cloud Vision AI
  • Seamless English and Traditional Chinese internationalization (i18next)
ReactViteSupabase Auth & DBAWS S3Google Cloud Visioni18next
Visit backthen.photo ↗Inquire / Feedback ↓
japu.app ↗Cloud & Web Platform
Live Web App • japu.app

Japu — Family Tree SystemInteractive Multi-Clan Genealogy & Lineage Graph App

An interactive full-stack genealogy visualization platform that renders complex multi-generational family trees and cross-clan marriage networks with fluid pan-and-zoom graph navigation.

Live URLjapu.app
DatabaseTurso (libSQL)
VisualizationInteractive Graph
ArchitectureFull-Stack SPA
  • Interactive lineage graph engine supporting multi-family trees and cross-clan marriage links
  • Includes curated classical genealogical datasets (such as Dream of the Red Chamber clans) out of the box
  • Low-latency edge persistence powered by Node.js, Express, and Turso (libSQL / SQLite)
  • Responsive state management with React, Zustand, family-chart, and Tailwind CSS
Reactfamily-chartZustandTurso / libSQLNode.js / ExpressTailwind CSS
Explore japu.app ↗Inquire / Feedback ↓
tax-gpt.ca ↗Applied AI Platform
Live AI App • tax-gpt.ca

TaxGPT CanadaAI-Assisted Canadian Tax Consultation & Research Platform

An applied AI consultation web application tailored for navigating Canadian tax regulations, deductions, and structured tax scenarios with conversational precision.

Live URLtax-gpt.ca
AI ModelGoogle Gemini
BackendFirebase Cloud
DomainCanadian Tax
  • Domain-tuned conversational assistant powered by Google Gemini GenAI models
  • Structured chapter-by-chapter tax guidance and scenario breakdowns for Canadian filers
  • Serverless backend orchestrated with Firebase Cloud Functions and Express APIs
  • Fast, accessible React + Vite interface designed for clarity on desktop and mobile
Google Gemini AIFirebase FunctionsReactExpressTailwind CSS
Launch tax-gpt.ca ↗Inquire / Feedback ↓

✦ Software Design & Architecture

What We Architect & Build

Our software design practice spans four core engineering disciplines—combining clean systems architecture, modern cryptography, and intuitive user interfaces.

01
React & AstroCloudflare EdgeSupabase & TursoREST & Microservices

Full-Stack Cloud & SaaS Platforms

End-to-end architecture of resilient web applications—from reactive frontends (React 19, Astro, Vite) to distributed backends (Node.js, Express, FastAPI, Cloudflare Workers) and edge databases (Supabase, Turso/libSQL, Firebase, S3).

02
Tauri v2 & RustAES-256-GCMZero-KnowledgeWeb3 / Wallet Auth

Native Desktop & Cryptographic Security

High-performance, small-footprint desktop applications built with Tauri v2 and Rust, paired with zero-knowledge encryption (AES-256-GCM) and non-custodial blockchain identity (BIP32/BIP39 wallet signatures).

03
Manifest V3DOM & Content ScriptsLocal Media ProcessingChrome Web Store

Browser Extensions & Workflow Automation

Manifest V3 Chrome extensions engineered for deep web-app augmentation, media stream extraction, local deduplication, audio codec transcoding, and seamless Chrome Web Store distribution.

04
Google Gemini & LLMsCloud Vision & OCRAI Agent APIsRAG & Automation

Applied AI & Intelligent Agents

Practical AI systems that solve real domain problems—combining Google Gemini, Cloud Vision, and programmatic agent APIs with clean, human-centric interfaces and predictable guardrails.

✦ How We Deliver

From System Design to Production Scale

Every application we build follows a disciplined software engineering lifecycle focused on clarity, security, and rapid iteration.

01

System & Data Architecture

We define clear data models, security boundaries, and API contracts upfront—selecting the right runtime whether that is Cloudflare Workers, Turso/Supabase, or local Rust/SQLite.

02

Iterative Full-Stack Engineering

We build with modern, type-safe toolchains (TypeScript, React 19, Astro, Rust, Tauri v2) and automated end-to-end verification so features ship predictably without regression.

03

Privacy & Cryptographic Rigor

From zero-knowledge AES-256-GCM vaults (Grid Cache) to wallet-signed authentication (doggy.email), we protect sensitive user data by design.

04

Store & Cloud Edge Launch

We handle complete production rollout—including Microsoft Store and Chrome Web Store compliance, global edge CDN deployment, OAuth verification, and ongoing evolution.

✦ Technical & Product FAQ

Frequently Asked Questions

Answers about our public store applications, live cloud platforms, and custom software design engagements.

Are Grid Cache, MAID, and Ximalaya Downloader free to download and use?

Yes. Grid Cache is available as a free native Windows application on the official Microsoft Store, and both MAID (Message Aid for Google Messages) and Ximalaya Downloader (trusted by 1,000+ users) are available as free extensions on the official Chrome Web Store.

How do doggy.email and gush.email relate to each other?

gush.email was our version 1 cryptographic webmail platform and continues to run and serve its existing user base at https://gush.email. doggy.email (https://doggy.email) is our upgraded version 2 full-stack architecture—expanding passwordless Bitcoin and Dogecoin wallet authentication with a modernized React 19 client, WildDuck microservices, and programmatic REST/webhook email APIs built specifically for AI agents.

What types of custom software design and engineering projects do you take on?

We partner with founders, teams, and organizations to design and build full-stack web and cloud platforms (React, Astro, Node.js, Cloudflare Workers, Supabase, Turso), native cross-platform desktop applications (Tauri v2 & Rust), custom Manifest V3 Chrome extensions, and applied AI workflows (Google Gemini, Cloud Vision, and autonomous agent tooling).

How do you approach privacy and cryptographic security in your software?

Security is engineered at the data-model layer rather than bolted on later. Whether designing zero-knowledge multi-partition AES-256-GCM encryption in Grid Cache, 100% local client-side message processing in MAID, or non-custodial wallet signature authentication in doggy.email, we minimize server trust and protect user data by default.

How can I report feedback on a product or discuss a new software project?

Use the inquiry form below to reach our engineering team directly. Select whether you are reaching out about custom software architecture, a desktop/extension/AI build, or feedback on one of our shipped products, and we will respond within 1–2 business days.

✦ Connect With Treasure Island

Start a Software Conversation

Whether you want to architect a new software platform, build a custom desktop app or browser extension, or share feedback on one of our live products, send us a note below.

Direct Engineering Communication

Speak directly with the software architect and builder behind every product in our lab.

Production-Proven Across Platforms

Shipped and verified on Microsoft Store, Chrome Web Store, Cloudflare Edge, AWS, and Firebase.

Prompt Response

We review every inquiry and respond within 1–2 business days with clear next steps.

Quick links to our live applications:

doggy.email ↗gush.email ↗tax-gpt.ca ↗japu.app ↗backthen.photo ↗
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