EXPLAIN THE CODE
You shipped it. You cannot explain it.
Copilot autocompletes, you accept. Tests pass. A reviewer asks why and your brain blanks. The answer was never yours — you borrowed the reasoning.
Stop copying AI answers.
Start building real developer skills.
Prepzio is a pocket-sized practice coach for juniors who ship with AI every day — then freeze when asked to explain their code, debug without paste, or walk through a solution in an interview. Five minutes of guided practice. Hints, not handouts. An Independence Score (0–100) tracks how independent you are getting — with a simple Level (L1–L5) underneath.
Private beta · Summer 20260–2 yrs experience · self-taught & bootcampIndependence Score 0–100 + Level L1–L5Learning coach — not a cheat tool
Early-stage, honestly
We're currently interviewing the first 100 AI-using junior developers to shape Prepzio.
Built from early conversations with self-taught and bootcamp juniors who use ChatGPT, Copilot, or Cursor while learning. No inflated user counts on this page — just problems we keep hearing in those calls.
The honest part
AI made you faster. Did it make you better?
Most junior devs today use AI every day. A smaller group still struggles to explain a basic loop without help. Both can be true.
DEBUG & INTERVIEW
You paste fixes. You cannot trace them live.
Something breaks. You ask AI, apply the patch, move on. In a screen share or whiteboard round you cannot isolate the bug or rebuild the logic without help.
NO COMPASS
You do not know what to fix.
You finish a tutorial. You feel productive. You still do not know whether you are growing, plateauing, or just borrowing answers — until the next interview.
Sample practice question · JavaScript · Junior level
See how Prepzio coaches — not answers
Most AI tools give you the answer. Prepzio asks you to think first. Try a real practice question below.
Three things we built first
Not another LeetCode. A practice coach that watches how you think.
Independence Score + Level
Independence Score (0–100) is your main trend — higher means less paste, more real understanding. AI Dependency Level (L1–L5) is the simpler weekly label underneath. Same ladder, two views. No competing numbers.
Socratic practice, not answers
Hints ladder up: direction → sub-problem → mini example. You explain in your own words, debug your own reasoning, and practice saying it out loud for interviews. The AI asks better questions — it does not hand you the script.
7-day personal roadmap
After your first session, Prepzio drafts a 7-day plan of 5-to-15-minute practices targeting your weakest two rubric criteria. Re-assess on day 7. Adjust. Repeat.
Inside the app
Four screens. One loop. Built to be the shortest path between “I copied that” and “I understood that”.
Preview UI from the private beta build — layout and copy may change. The practice loop (question → hints → rubric → roadmap) will not.
DAY 3 / 7STREAK 3
Today · Debugging
Find the bug before the AI does.
5 min · 1 question · 1 reflection
▶ Start practice
WEEK 1 · ROADMAP
Independence Score
78/ 100
AI Dependency Level: L4/5
Home
Independence Score (0–100) + Level on home. One daily focus.
Q 1 / 102:14
Debugging · Junior
Why does this return undefined?
function total(items) {
items.forEach(i => {
return i.price;
});
}HINT · 1 / 3
What does forEach's return value actually do?
YOUR ANSWER
forEach ignores returns — total returns nothing…
Need a hintSubmit
Session
Question → attempt → hint ladder → reflection. Then submit.
RUN COMPLETE
Session · rubric
You explained it. Nice.
Per-criterion dots · this session only
Problem understanding
Independent attempt
Debugging approach
Explanation clarity
AI dependency
NEXT STEP
Try the same bug pattern in a `.map` next session.
Feedback
Rubric-scored, not just right/wrong. Specific next step.
WEEK 15–15 MIN / DAY
Your 7-day plan
Built from your assessment, not the catalog.
- D1Problem reading
- D2OOP basics
- D3Debugging without AI
- D4REST / API basics
- D5Explain it back
- D6Mixed practice
- D7Re-assessment
7-day roadmap
Generated from your weak rubric criteria. 5–15 min/day.
How it works
Five to eight minutes from sign-up to your first real practice rep.
No tutorial maze. No tutorial-finished-but-still-confused feeling. You meet the product the way you meet a coach: it asks, it watches, it gives you something to work on tomorrow.
- STEP 01
4-step profile
Experience, goal, AI tools, weak areas. No LinkedIn URL, no recruiter pitch.
~2 min - STEP 02
Independence assessment
A real junior problem. You explain. You attempt. We measure how you reach for help — then give you an Independence Score (0–100) and Level (L1–L5).
~2 min - STEP 03
Skill baseline
Two quick questions — one MCQ, one short text — across your weakest area.
~1 min - STEP 04
Result + day 1 practice
Three strengths, three gaps, a 7-day roadmap, and your first guided session.
~5 min
The rubric
Eight signals. One picture of how you actually code.
Instead of one binary “got it / missed it”, every session is scored across eight junior-growth signals. Independence Score (0–100) is your overall trend. AI Dependency Level (L1–L5) is the simpler weekly snapshot — same direction, different scale. The dots below are session rubric only — not your Independence Score.
- Problem understanding
- Independent attempt
- Conceptual correctness
- Explanation clarity
- Debugging approach
- AI dependency
- Reflection quality
- Interview readiness
Session #042 · rubric only
Debugging without AI
Problem understanding
Independent attempt
Debugging approach
Explanation clarity
AI dependency
NEXT STEP · TRY THE SAME BUG PATTERN INSIDE A `.MAP`.
Where it fits
Not a ChatGPT replacement. Not a LeetCode grind.
Prepzio is the practice layer on top of the AI you already use, sized for juniors who want to stay independent, not faster at copying.
| ChatGPT / Copilot | LeetCode / similar | Prepzio | |
|---|---|---|---|
| Gives you the answer | Instantly. | After you give up. | Only as a last resort. With friction. |
| Measures how you think | No. | Pass or fail. | 8-criteria rubric per session. |
| Junior-level scope | Anything. | Hard skews heavily. | Built for 0–2 yrs of experience. |
| Daily 5-min loop | Up to you. | 30+ min puzzles. | Mobile-first, fits a coffee break. |
| Tracks independence | No. | No. | Independence Score 0–100 + Level L1–L5. |
Built for
If you finished a course and still feel borrowed, this is for you.
Bootcamp graduate, 4 months in
You finished a JS bootcamp, ship features with Copilot, but freeze on basic interview questions. You need to rebuild the fundamentals you skipped while moving fast.
Self-taught, year one
You learned by reading and ChatGPT. You can build small projects but cannot explain why your code works. Recruiters keep asking "walk me through your solution".
CS student, hunting first role
You have the theory but freeze in live coding. AI usage during coursework eroded your independent problem-solving muscle. You want it back before your next internship round.
Honest answers
Frequently asked, before you ask.
Have you talked to real junior developers?
Yes — that is what we are doing right now. We are interviewing AI-using juniors (self-taught, bootcamp, and early-career) to validate the problem and shape the first practice flows. The waitlist helps us invite the next cohort for beta. We do not publish user counts we do not have.
What happens after I join the waitlist?
Your email is saved. We send at most one short product update per month. When the private beta opens (target: summer 2026), waitlist members get invites in join order. Beta is free. Founder pricing applies if you subscribe later. You can unsubscribe or request deletion anytime.
Are the app screens on this page real?
They are accurate previews of the private beta UI — built from the same flows we are shipping (home, session, rubric feedback, 7-day roadmap). They are not live app screenshots yet. Visual polish may change; the practice loop will not.
Is this another LeetCode clone?
No. LeetCode rewards finding the right answer fast. Prepzio rewards how you think — your hint usage, your reasoning, and how clearly you can explain a solution. A junior who can explain a working `for` loop is more hireable than one who memorised quicksort.
Will the AI just give me answers?
It is built not to. Prepzio uses a Socratic hint ladder — direction first, then a smaller sub-problem, then a related mini example. You can always tap "Show solution", but doing so is friction-full and lowers your Independence Score over time.
How do Prepzio scores work?
Independence Score (0–100) tracks how independently you think over time — higher is better. AI Dependency Level (L1–L5) is a simpler label for the same growth ladder: L1 means you mostly copy AI answers, L5 means you can handle a fresh problem on your own. Session rubric dots (1–5 per criterion) score a single practice only; they are not your Independence Score.
What is the AI Dependency Level (L1–L5)?
The simpler weekly label under your Independence Score. L1 means you mostly paste AI answers. L5 means you can handle a fresh, similar problem on your own. Higher level = less reliant on AI. It is framed as a growth axis, not a punishment.
Will I have to pay?
Private beta is free. We will introduce small plans (think coffee-money) once core practice loops are validated. Everyone on the waitlist will get founder pricing and an invite before launch.
When can I actually use it?
Private beta opens summer 2026. Waitlist members are invited in batches, in the order you joined. We are not chasing a public launch — we are chasing a product that genuinely moves the needle for the first 100 juniors.
Why a mobile app, not a website?
Daily 5-to-15-minute sessions need to fit in your commute, breaks, and queues — not your laptop. The retention loop only works if practice is one tap away. The web site you are reading is the only thing we will ship to desktop.
How is my data used?
Your email is used only for waitlist and beta invites. No tracking ads, no resale. Inside the app we log practice answers and hint usage to compute your rubric scores. You can request deletion at any time. Details on the Privacy page.
Be early
The first 100 juniors on the list shape the product.
Joining does not charge you anything. We use the list to validate demand, invite the first cohort, and tell you when the app is ready. No recruiters. No ad tracking on this site.
- One short email per month — product updates only, unsubscribe in one click
- Beta invite in batch order when we open (target: summer 2026)
- Founder pricing locked in for waitlist members
- Your first Independence Score (0–100 + Level) included — free in beta