SheldonTek Co., Limited · Hong Kong · est. 2022
AI tools, software and explainer videos, built to be checked.
We write software that turns sources and data into clear explanations. We use it on our own channel, and we build the same kind of tools and videos for clients.
Models draft quickly. Code checks the facts. People sign off.
Watch our work
Made end to end with NarratorForge: sources, script, synthetic narration, code-drawn animation and subtitles. The video loads from YouTube only when you press play.
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What we build
Three kinds of work, all running on the same code base.
AI tools with checks built in
Language models draft. Our code checks quotes, numbers and output files before anything moves on.
Data analysis and visualisation
We clean the data, analyse it and draw charts in code, so every figure can be traced back to a row.
Sourced explainer videos
Education and business-history videos with code-drawn animation, in English and Chinese.
Products
Things we have built and run ourselves. Each link goes to the live product.
AI media
NarratorForge
An AI-assisted pipeline for sourced, bilingual explainer videos: from saved sources to script, narration, code-drawn animation and subtitles, with an automated pronunciation check and other quality gates. One set of scene code renders landscape and vertical versions.
Laws of Wealth
Our YouTube channels, made with NarratorForge: short histories of merchants, markets and economic ideas, in English and in Chinese. History and principles only, not investment advice.
English channel · @LawsofWealth Chinese channel · @sheldon7568
Bilingual Explainer Kit In development
A toolkit for making Cantonese and English explainer videos side by side. Not released yet.
Merchants of East and West
A free ebook of 24 business principles from merchants in China and Europe, in Chinese and English. PDF on GitHub.
AI tools
Sheldon TTS
A text-to-speech web service with multiple voices and languages, including Chinese and English.
Invokera
Turns an API you own into a hosted MCP server and REST tool endpoints that Claude, Cursor and other AI agents can call.
Utilities
CrossPrice
Compares the total cost of a product across shops, including shipping and tax, and flags which ones ship to your address.
SpaceSentinel
A free disk clean-up guide for Windows, Mac, iOS and Android, plus a one-click Windows cleaner. Everything runs locally; nothing is uploaded.
Services
Tell us what you need and roughly when. We reply with a fixed scope and a quote.
AI tool development
Assistants, document processing and agent tools built around your workflow, with code that checks what the model produces.
- Working tool with automated tests
- MCP or REST endpoints if other AI agents need to call it
- Notes on running cost, limits and data handling
Software development, testing and maintenance
Websites, web apps, internal tools and automation. We also take over existing code: add tests, fix bugs and keep it running.
- Source code in your repository
- Test suite, deployment and a short handover guide
- Ongoing maintenance on an agreed scope
Custom video
Ads and promos, science and educational explainers, birthday and event videos. You approve the script before anything is rendered.
- Script in English and/or Chinese, sourced for explainers
- Landscape 16:9 and vertical 9:16 MP4
- Subtitle files (SRT); synthetic voice or your own recording
Data analysis and visualisation
From a spreadsheet, a database or a public dataset to clean data, analysis and clear charts, with a short written summary.
- Charts (SVG/PNG), a dashboard or an interactive page
- Cleaned data and the code that produced it
- Scheduled updates if the source data changes
Also on request: voice-over and subtitles in several languages, and translating a website or app into several languages, as on this site.
How an engagement runs
- Discovery callGoal, audience, constraints, deadline.
- Fixed-scope quoteWritten scope, deliverables and timeline.
- MilestonesYou review each stage before the next one starts.
- Handover and supportFiles, code and notes, plus a support period set in the quote.
How we make a video
Six steps. You see the work at each one.
- BriefGoal, audience, deadline.
- Sources and scriptEvery claim tied to a source.
- StoryboardWhat appears on screen, scene by scene.
- ProductionCode, narration, animation.
- ReviewAutomated checks, then yours.
- DeliveryFiles, code and notes.
What you can check
No client logos or invented metrics. These numbers are public.
Narration in our videos is synthetic, and every description says so.
Start with an email
A few lines on what you need is enough.
- Address
- Unit 1104A, 11/F, Kai Tak Commercial Building,
317–319 Des Voeux Road Central, Hong Kong - Company
- SheldonTek Co., Limited 謝爾頓科技有限公司