Products
SofinWave builds and runs four products of its own: SmartFinTrack, a free personal finance manager; Tử Vi Đẩu Số, which casts and interprets Zi Wei Dou Shu astrology charts with AI; KingNNT Course, an e-learning platform for hands-on AI and programming courses; and KingNNT Blog, where our engineers write about backend and AI agent systems. They are built by the same team, to the same standards, as the software we build for clients.
SmartFinTrack — personal finance management
A place to see where the money actually goes. You log income and expenses against categories, set what each category is allowed for the month, record the assets and investments you hold, and read the whole picture back as reports and charts. It is free, and the interface is available in Vietnamese and English.
- Income and expenses by category
- Monthly budgets and limits
- Assets and investments
- Reports and charts
Tử Vi Đẩu Số — chart casting and AI interpretation
Zi Wei Dou Shu, or Purple Star astrology, places stars into twelve palaces derived from a birth date and time. The tool does that casting automatically — solar or lunar calendar, leap months included — showing the twelve palaces with their major stars and five elements, then producing a detailed AI reading. Casting a chart is free; signing in saves your charts and unlocks the detailed AI reading. Available in Vietnamese and English.
- Chart cast from birth date and time
- Solar or lunar calendar, leap months included
- Twelve palaces, major stars, five elements
- Detailed AI interpretation
KingNNT Course — hands-on AI and programming courses
An e-learning platform for people who want to use AI and code in their actual work rather than read about it. The courses cover applied AI — prompting, AI agents, workflow automation — alongside programming and data, and each one is built around real projects. You learn at your own pace on any device: every course has open lessons to try before buying, a course is bought once and kept for life, and payment is by VietQR or payOS bank transfer, confirmed automatically. The interface is available in Vietnamese and English.
- Hands-on courses built on real projects
- Open lessons to try before buying
- One-time purchase, lifetime access
- VietQR payment, confirmed automatically
KingNNT Blog — a backend engineering notebook
Where our engineers write up what they learn running systems in production: backend architecture, infrastructure, and the tooling around AI agents — protocol changes, framework migrations, observability, and the costs that only show up after launch. The articles are long-form and practical, written for engineers who have to make the same decisions. It is free to read with no account, published in Vietnamese and English with a separate RSS feed for each, and exposes an llms.txt index so AI tools can read it too.
- In-depth articles on backend and AI agent systems
- Published in Vietnamese and English
- A separate RSS feed for each language
- An llms.txt index for AI tools and answer engines
Why we build our own products
Consulting advice is cheap to give and expensive to live with. Running our own applications means we carry the consequences of our own recommendations — the deployment, the bug reports, the cost of keeping something up long after launch. The products are built by the same engineers, on the same stack, under the same standards as client work, which is what makes them evidence rather than decoration.
Frequently asked questions
- Are SofinWave's products free?
- SmartFinTrack is free to use, and casting a chart on Tử Vi Đẩu Số is free. On KingNNT Course the open lessons are free to try; each full course is a one-time purchase with lifetime access. KingNNT Blog is free to read.
- Do I need an account?
- SmartFinTrack requires an account, because it stores your own financial records. Tử Vi Đẩu Số casts a chart without one; signing in lets you save charts and read the detailed AI interpretation. KingNNT Course needs one to enrol in a course and pick up where you left off. KingNNT Blog can be read without one.
- Can SofinWave build something like this for us?
- Yes — that is the consulting business. All of them were built by the same team that takes on client work, using the same architecture and delivery process. Get in touch and describe what you have in mind.
Want something like this built?
The team that built these products takes on client work. Tell us what you are trying to build and we will tell you how we would approach it.
Talk to us