built on the Striver A2Z DSA Sheet

Stop grinding DSA problems blind.

A Socratic AI coach that questions your approach before it ever shows you the answer, grades your own attempts against the pattern, converts any solution into the language your interview loop uses, and replays a step-by-step visual dry run — so you actually understand it, not just memorize it.

Get lifetime access — $2.5
one-time · lifetime access
see what's inside ↓
zsh — dsa-vault
$ git clone git@github.com:you/dsa-vault-pro-build.git
$ node start.js
> one-time GitHub sign-in to verify your license...
> using your local Claude / Codex / Gemini login — no API key needed
> ready on http://localhost:3000
// see it in action

Watch a real session, not a mockup.

// what's included

Five things you get, nothing you don't.

01
Full A2Z sheet, browsable
Every problem in Striver's A2Z DSA Sheet, indexed with working Java solutions you can search and jump into.
02
Socratic coach chat
Talk through your own intuition first. The coach questions your approach before it ever shows you the write-up.
03
Interview in any language
Interviewing in Python, C++, or JS? Convert every Java solution instantly, not just the ones you memorized.
04
Graded practice attempts
Submit your own attempt and get it graded against the pattern — not just pass/fail on test cases.
05
See exactly why it fails
A step-by-step visual dry run of the algorithm's state — so a wrong answer tells you why, not just that.
Runs entirely through Claude, Codex, or Gemini CLI already on your machine — your pick. No API key required, no added usage.
// how it works

Three steps, no back-and-forth.

01
Pay once via Razorpay
$2.5, one-time. No account creation required beyond checkout.
02
Get access automatically
No waiting on a human. Access is granted to your GitHub account within a minute of payment.
03
Download it and start practicing
Two commands, nothing else to install. A one-time sign-in confirms it's really you, then it runs on your machine, on your own Claude, Codex, or Gemini login, for good.
// launch price
$5$2.5/ lifetime access
Private GitHub repo access. git pull anytime for updates. No subscription, no recurring charge.
Connect GitHub to continue →
// faq

Questions worth answering upfront.

Do I need an API key?
−
No, not by default — everything runs through your existing Claude, Codex, or Gemini CLI login (your choice). If you'd rather bill per-token instead of using your subscription, you can set that CLI's own API key env var, but it's optional. This repo never talks to any AI provider directly and never adds usage of its own.
Is this a subscription?
+
No — one-time payment. You get permanent collaborator access to the private repo and can `git pull` for updates whenever they ship.
What if I don't have Claude Code set up?
+
You don't have to use Claude — Codex CLI and Gemini CLI work too, pick whichever you already have. If you have none of the three set up (or an API key for one of them), set one up first, this isn't the right fit yet without it.
Can I use a language other than Java for practice?
+
Yes. The base solutions are Java, but the conversion feature ports any solution into the language you actually interview in.
Can I share this with a friend?
+
No — it's licensed to your GitHub account specifically. The app checks live that you're still a collaborator before it'll run, so it won't work under someone else's account.
Do I need to know Git or GitHub well?
+
Just the basics. Payment sends a GitHub collaborator invite to your account automatically, then it's one `git clone` to set up and `git pull` whenever updates ship — no dashboards, no other accounts.
Does this work on Windows, Mac, or Linux?
+
Yes — anywhere Node.js and your chosen AI CLI (Claude, Codex, or Gemini) run: Windows, macOS, and Linux.
Do I need an internet connection?
+
Yes. Coaching, grading, and dry-run generation all run through your local AI CLI, which talks to its provider over the internet.
Does this work with a free plan?
+
No. Free tiers generally don't support the non-interactive CLI usage this needs — you need a paid subscription (Claude Pro/Max/Code, ChatGPT Plus/Pro, or Gemini Code Assist/AI Pro/Ultra) or an API key for whichever CLI you pick.
How long does setup take?
+
A few minutes: sign in with GitHub, `git clone`, `node start.js`. Nothing else to install.
Refunds?
+
No refunds once GitHub access has been granted — it's a digital product, delivered and usable immediately.