Independent founder & developer

I build practice-testapps that help peopleactually pass.

A founder building a growing family of focused exam apps. I set the standard; specialists who know each field build the questions.

Explore the apps Work with Trieu

0live apps,
more coming

Certification & entrance exams across many industries.

Now building

HVAC app

Made to pass

Trieu Ly

Designs · builds · ships every app

01Why I build this

Good prep shouldn’t costa fortune.

“Ten years ago I left development for marketing. A $35 course changed my life.”

That $35 taught me what good teaching is worth — and how little it should cost. Since then, exam prep has only grown more expensive, often needlessly.

I believe good prep shouldn’t be a luxury. That’s why I build these apps: serious practice at a fair price — founder-led, with specialists who write the questions and sit the real exams themselves.

Trieu LyFounder & developer

02The collection

A growing body ofwork.

One app, one exam — each a self-contained product, made by the same hands.

HVAC Prep

Practice mode

Question 4 of 25Practice set

A technician removes refrigerant from an appliance for service. What is the correct next step?

ARecover the refrigerant into an approved cylinder

BVent it slowly to the atmosphere outdoors

CAdd it to the low-side of the system

DStore the charged system without recovery

Explanation after you answerNext

Flagship appLive

HVAC technician certification · practice built for the trade

HVAC Certification App

The certification every HVAC tech needs, done properly. Written by people who know the trade, and we sit the real exam ourselves — so the practice mirrors the actual test.

Mirrors the real exam
Answer, then a clear why
Study on the job, on your phone
Written & reviewed by specialists

Start a practice test

Also in the collection

A growing collection of certification & entrance-exam practice apps.

More focused apps are already live, each built to the same standard. New ones join as they’re ready.

More coming

More on the workbench — one well-made exam at a time.

Suggest an exam

03Where AI comes in

Smart where it helps,honest everywhere.

AI never invents the exam. Inside the apps, it becomes a tutor that stays up with you until you pass.

Not AI slop

The questions aren’t invented. They’re earned.

Our specialists build every question, learned from the official certification for each field. AI never writes the exam — people who know the trade do.

AI’s one job here

It studies how each exam is set — patterns, emphasis, traps — so we can predict what’s likely to come up and aim your practice there. Pattern-finding, not fabrication.

Experts build & reviewAI sharpens relevance

Exclusive feature

An AI Tutor, built in.

Not a bolted-on chatbot — a patient teacher inside every app. It spots what trips you up and explains it until it lands.

~0%

Less than a 1:1 human tutor

Latest LLMs

Runs on the newest models, and upgrades as better ones ship.

Remembers your misses

Tracks what you got wrong and drills it until it sticks.

Teaches, not just marks

Explains the why and critiques your thinking — not just right or wrong.

Open 24 / 7

On call at 2am or between shifts. Always there.

AI Tutor

Online 24/7

Latest LLM

Reviewing a question you missed earlier

I picked B — venting it outdoors. Why is that wrong?

Good instinct to ask. Venting releases refrigerant into the air — that’s exactly what the rules forbid. The correct move is to recover it into an approved cylinder.

Remember it this way: recover, don’t release. Want a quick follow-up to lock it in?

Ask your tutor anything…

04How we build

Real people, sitting thereal exams.

No content farm — every question is expert-built, exam-checked, and made to a standard I won’t compromise.

Not a soulless generic app

We buy and sit the real exams ourselves.

Our specialists register and take the real certification as candidates — the pacing, the wording, the pressure. Then we build the practice to match, so you rehearse the exam you’ll actually sit.

Specialists, per field

Multi-industry experts write and review every question — each exam handled by someone who works in that field. Nothing scraped, nothing generic.

Reviewed, every question

Every question is checked against the official certification, then read again by an expert. Exam-accurate, not a best guess.

Founded and led by Trieu Ly.I set the standard and answer for it; a specialist bench builds the questions. One vision, many expert hands.

And in the app itself

Fast & light

Opens in a blink, even on cheap phones and slow signal. No spinners.

Reliable when it counts

Steady and dependable — built for the night before the exam, not just demo day.

Made for the phone in your hand

Mobile-first, because that’s where people study — on a break, between shifts.

Readable for everyone

Real contrast, honest type sizes, keyboard-friendly. It works however you read.

Nothing in the way

One calm screen, one job: the question in front of you. No clutter, no dark patterns.

06The through-line

One standard, kept steady

Founder-led vision, specialist-built questions, a real exam behind every app. Same care, first question to last.

05Why trust Trieu

A real maker witha point of view.

Three reasons they keep coming back — no hype, just how the work is made.

One name behind it

A founder who stakes his name on every app, backed by specialists who write the questions. One standard, real people you can reach.

Written by people who know

Experts author each exam and we sit the real test ourselves — so it matches what you’re walking into, not a generic knock-off.

Made and maintained

Live products, kept current. When an exam changes, a real team answers.

Live apps shipped

Questions human-reviewed

∞

Pick your exam.Start practicing.

Start a practice test — or reach out to partner or request a new exam. Either way, you’re talking to the founder.

Explore the apps Work with Trieu