Build engines.
Learn how they work. Bring ideas to life.
A hands-on engineering simulator where builders, makers, and curious minds assemble real engines, learn how every part works, and celebrate every successful simulation — solo or side by side.
Step 1
Choose an engine
V8, V10, V12 or dirt bike
Step 2
Build it with AI guidance
Every part explained
Step 3
Simulate performance together
Hear it run, see it work
Plans from just $4.99/mo — new lower pricing · Secure encrypted checkout · Cancel anytime
Built with purpose — for every creative mind. YouBuildItAI began as a father & son project by Darrance and Aiden Tezino, and grew into a platform for all builders. Every subscription funds Aiden's early college fund and fuels a love of STEM.
Read Our StoryHow it works
Four steps from beginner to builder
Choose Your Build
Pick an engine, dirt bike, or vehicle project — from a starter 85cc bike to a V10.
Drag & Drop Parts
Snap pistons, carburetors, suspension, and wiring into place piece by piece.
Learn How Each Part Works
Every component comes with plain-English explanations of what it does and why it matters.
Complete Builds & Earn Badges
Finish builds, run simulations, level up, and collect achievement badges.
From Digital Builds to Real Repairs
The skills you master in the simulator now work on your actual vehicle. Diagnose real problems, pull exact specs, and run your repair like a pro.
Real-Vehicle Diagnosis
Describe any symptom on your actual car and get ranked causes plus a step-by-step repair plan.
Reference Guides
Warning lights, fuse boxes, fluid capacities, torque specs, and maintenance schedules for your exact vehicle.
Drag-and-Drop Repair Board
Pull repair steps, articles, and videos onto a live board and track your fix from start to finish.
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What's inside
A complete virtual shop class
Drag & Drop Builder
Assemble engines, dirt bikes, and vehicles part by part with snapping placement and instant feedback.
AI Build Coach
A built-in assistant guides your next step, explains mistakes, and keeps you moving.
Part Encyclopedia
Tutorials and part-level explanations: what it does, how it works, why it matters.
Diagnostic Lab
Take real repair work orders — scan codes, test circuits, and fix faults like a shop tech.
Build Challenges
Timed and accuracy challenges with XP, streaks, and a leaderboard.
Premium Build Library
Engines, dirt bikes, dream cars, turbo and suspension setups — all unlocked with your plan.
Subscriber-only access
What you unlock
Everything below is behind the paywall — one subscription opens the whole workshop.
V8, V10 & V12 Engine Builds
Full assembly with pistons, camshafts, timing chains & exhaust valves
Members onlyDirt Bike Builder
Swap suspensions, power units, wheels & tires with live performance stats
Members onlyDiagnostic Lab
Real repair work orders with scanner, multimeter & oscilloscope tools
Members onlyAI Build Coach
Step-by-step guidance, mistake explanations & upgrade advice
Members onlyDream Car & Vehicle Assembly
Full-vehicle builds from chassis to body panels
Members onlyChallenges, XP & Leaderboards
Daily challenges, badges, rare part unlocks & rankings
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Why subscribe?
Three pillars of the experience
Unlimited Engine Builds
V8, V10, V12, dirt bikes & full vehicle assemblies. As many builds as you can dream up — no caps, no limits.
Advanced AI Simulation Tools
Real-time physics, diagnostic lab, ECU tuning, drag strip & aero lab. Your AI Coach explains every decision.
Father–Son Learning Modules & Challenges
Guided lessons, daily challenges, badges & leaderboards built for two people to learn and build side by side.
This is not a toy — it's a learning platform.
Designed for engineering curiosity, bonding, and real-world mechanical understanding. Every build teaches how an engine actually works — compression, ignition, timing, airflow.
Worth every dollar for the memories and skills created.
The difference
Free vs Premium
Free gives you a tour. Premium gives you the whole workshop.
| Feature | Free | Premium |
|---|---|---|
| Engine builder access | ||
| AI Build Coach & guidance | ||
| Simulation & diagnostics | ||
| Dirt bike & vehicle assembly | ||
| Drag strip, aero lab & ECU tuning | ||
| Father–son challenges & badges | ||
| Daily challenges & leaderboards | ||
| Build gallery & sharing |
From $4.99/mo · Cancel anytime
Loved by families
What builders are saying
"My 12-year-old and I built a V8 together on a Saturday morning. He now explains camshafts to his grandpa. Worth every penny."
Marcus T.
Father of two
Why YouBuildItAI works
Not a game. Not a textbook. Real shop skills.
Most build apps let you pick colors and rims. YouBuildItAI makes you assemble the machine yourself, understand every part, and diagnose what's wrong when it doesn't run.
A safe place to mess up
Drop a piston, wire something backwards, blow a fuse — then undo it and try again. No broken parts, no wasted money.
Learning built into every part
Unlike car configurator games, every component teaches you what it actually does in a real machine.
Real diagnostics, not just assembly
Run simulations, read live telemetry, and troubleshoot faults with scanner and multimeter tools — skills real shops use.
Coaching, not just clicking
The AI Build Coach encourages you, suggests the next step, and explains mistakes without judgment.
Who this is for
Built for the next generation of builders
High school students
Explore automotive tech before committing to a trade program — and show up to shop class ahead of everyone.
Shop class beginners
Practice assembly and diagnostics at home so real tools feel familiar, not intimidating.
Young riders & mechanics
Learn how your dirt bike or first car actually works so you can maintain and upgrade it yourself.
Every subscription supports a distraction-free learning environment with no ads and no chat with strangers — just building and learning, for creators of every age and background.
Why this app exists
Built by a Father & Son, for Every Builder
We didn't just build an app — we built time together. YouBuildItAI started as an intentional father-son project: a way to share a love of engineering and spark STEM creativity. But it grew into something bigger — a platform for every creative mind who wants to build. Every subscription still goes toward my son Aiden's early college fund, and every subscriber joins a community that believes engineering is for everyone. When you subscribe, you're not feeding a corporation — you're helping builders everywhere create, one build at a time.
— Darrance & Aiden Tezino, Creators of YouBuildItAI
Read the full storyStarted with Bonding
Built side by side — a father and son learning, designing, and problem-solving together.
STEM Through Creativity
Proof that engineering skills grow from curiosity, play, and building things you care about — for everyone.
Aiden's College Fund
Every subscription directly supports an early college fund for a young builder’s future — and fuels the platform for all.
Why subscribe today
Every day you wait is a build you didn't finish
Instant access
Your full workshop opens the second checkout completes — no waitlist, no setup.
The library keeps growing
New build kits, scenarios, and AI coaching ship regularly. Lock in today’s price before plans expand.
Join 1,200+ builders
Climb the same leaderboards, take the same daily challenges, and earn badges from day one.
Trust & safety
Subscribe with confidence
Secured by Stripe
Payments run entirely through Stripe. Your card details never touch our servers.
Cancel anytime
Monthly billing with no contracts, no hidden trial gates, no surprise annual charges.
Your data stays private
No ads, no selling your info. Your subscription is what funds the platform.
Built for real learning
Every tool mirrors real shop equipment and workflows — not arcade shortcuts.
One plan. The whole workshop.
Your subscription keeps YouBuildItAI ad-free, funds new build kits and AI coaching, and unlocks every tool the moment you sign up. Plans now start at just $4.99/month — cancel anytime.
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See it in action
A build, start to finish
Drag pistons, camshafts & timing chains into place — together.
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Your first build is waiting.
Subscribe now and open the full workshop — every builder, the Diagnostic Lab, and your AI coach.
Subscribe NowPlans from just $4.99/mo · Secure encrypted checkout · Cancel anytime