apptah

Sing Hei Yeung 楊承熙 — AI Agent Engineer

楊承熙（Howard Yeung）— 香港 AI Agent 工程師

Sing Hei Yeung (also known as Howard Yeung; Chinese: 楊承熙) is an AI agent engineer based in Hong Kong. He builds and ships AI agents end-to-end under the apptah brand — agent architecture, tool calling, memory management, and RAG — alongside local-first products and indie iOS apps, on top of six years of enterprise infrastructure in financial services (Mizuho Bank, current; HashKey; AIA).

楊承熙（英文名 Howard Yeung， App Store 註冊名 Sing Hei Yeung）是來自香港的 AI Agent 工程師。 他在 apptah 品牌下端到端打造 AI Agent 與獨立 iOS／macOS 應用，作品包括 OpenCowork（桌面 AI Agent）、 OpenClaw Memory Stack（LLM 記憶系統）、Autopost（品牌聲音 SaaS）、 TaxSearch（本地文件搜索）、PrivateAgent（iPhone 35B 模型）、 DragDrop26（macOS 選單列工具）、SwipeClean26（iPhone 相片清理） 及 COMFi（多語電商）等八個產品。專注於裝置端智能、代理記憶系統、 以及尊重用戶隱私的安靜自動化。

Projects · 產品

  1. OpenCowork — native open-source desktop AI agent (Tauri 2 + React 19) with a bundled Claude Code-compatible runtime behind an enforced trust boundary. Multi-agent orchestration with agent teams and per-task git worktrees; plugins, skills, MCPs, and hooks published for Claude Code load natively.
    原生開源桌面 AI Agent（Tauri 2 + React 19），內建 Claude Code 相容運行時並以強制信任邊界驅動；支援多代理協作，Claude Code 的 plugin / skill / MCP / hook 原生載入。
  2. OpenClaw Memory Stack — commercial LLM memory plugin ($49) cutting API costs up to 90% via 5-engine parallel search (BM25 · vector · markdown · facts · history). MCP-compatible, works offline.
    商用 LLM 記憶插件（$49），5 引擎平行搜索降低 API 成本最多 90%，相容 MCP，可離線使用。
  3. Autopost — production LLM SaaS that learns brand voice and publishes daily. 500+ businesses on private beta waitlist. FastAPI · Celery · PostgreSQL · Anthropic Claude.
    AI 社群媒體自動化系統，學習品牌聲音並每日自動發佈，私測階段已有 500+ 商家輪候。
  4. TaxSearch — local-first document search. Rust + Axum, hybrid retrieval (BM25 + pgvector) over PDFs, Excel, PPTX, HTML, email. Three llama.cpp Metal services: embedding, reranker, query expansion.
    本地優先文件搜索引擎，Rust + Axum 混合檢索（BM25 + pgvector），三個 llama.cpp Metal 服務。
  5. PrivateAgent — native iOS app running 35B-parameter LLMs on-device with ~1.4 GB RAM at ~3 tokens/sec on iPhone 16 Pro. NVMe expert streaming, TurboQuant KV. Apache 2.0.
    iPhone 16 Pro 上以約 1.4 GB RAM、約每秒 3 tokens 執行 35B 參數 LLM 的原生 iOS 應用，採 Apache 2.0 授權。
  6. DragDrop26 — lightweight macOS menu bar utility for instant file, photo, and link staging via drag-and-drop. Built for macOS 26. Revenue-generating on the Mac App Store.
    macOS 選單列檔案、相片、連結拖放暫存工具，Mac App Store 已產生收入。
  7. SwipeClean26 — iOS utility using 100% on-device AI to cluster similar photos and videos for fast swipe-based cleanup. App Store.
    使用 100% 裝置端 AI 將相似相片影片分組，滑動式快速清理。已上架 App Store。
  8. COMFi — multilingual e-commerce platform (Next.js 16 + MedusaJS v2) for a Hong Kong infant bedding brand across 9+ APAC markets. Custom regional payment provider.
    為香港嬰兒寢具品牌打造的多語電商平台，覆蓋 9+ 個亞太市場，自建區域支付方案。

FAQ · 常見問題

Who is Sing Hei Yeung (Howard Yeung / 楊承熙)?
Sing Hei Yeung — also known as Howard Yeung; Chinese 楊承熙 — is an AI agent engineer based in Hong Kong. He builds and ships AI agents end-to-end under the apptah brand, on top of six years of enterprise infrastructure in financial services — Mizuho Bank (current), HashKey, and AIA.
What is OpenCowork?
OpenCowork is a native open-source desktop AI agent for macOS and Windows (Tauri 2 + React 19). It bundles a hardened Claude Code-compatible runtime and drives it behind an enforced trust boundary — per-tool and per-directory permission grants, secrets piped over stdin. It runs multi-agent orchestration (agent teams, subagents, per-task git worktrees), and plugins, skills, MCP servers, and hooks published for Claude Code load natively.
What is apptah?
apptah is the brand under which Sing Hei Yeung (Howard Yeung / 楊承熙) ships independent AI products — iOS and macOS utilities, a commercial LLM memory plugin, an AI social-media SaaS, multilingual e-commerce, and a local-first document search stack. The work is local-first by default: on-device intelligence, privacy-respecting, and quiet automation.
What does Autopost do?
Autopost is a production LLM SaaS that learns a brand's voice from past posts and guidelines, then generates and publishes social content on schedule. 500+ businesses are on the private beta waitlist. Stack: FastAPI, Celery, PostgreSQL, Anthropic Claude.
How much does OpenClaw Memory Stack cost?
OpenClaw Memory Stack is a commercial LLM memory plugin priced at US$49. It cuts API costs up to 90% via 5-engine parallel search across BM25, vector embeddings, markdown, fact store, and compressed history. It is MCP-compatible and works offline.
Are apptah's iOS and macOS apps on-device or cloud-based?
They are on-device. SwipeClean26 clusters photos 100% on-device. PrivateAgent runs 35B-parameter LLMs natively on iPhone at ~3 tokens/sec and ~1.4 GB RAM. DragDrop26 is a local macOS menu bar utility. Privacy and offline capability are explicit design defaults.
Where is apptah based?
Hong Kong. apptah serves Hong Kong SMBs and APAC markets, and Sing Hei Yeung 楊承熙 works directly with HK partners via WhatsApp at +852 6594 4804. Content and tooling are bilingual English and Traditional Chinese.
How do I contact apptah?
Email support@apptah.com for project enquiries, partnerships, and press. HK partners can reach Howard directly on WhatsApp at +852 6594 4804. Professional background lives on LinkedIn (/in/singhei-yeung), code on GitHub (@Apptah), and personal updates on Threads (@daidouofficial).

Contact · 聯絡