Now in Beta

Find exactly why you're
failing DSA problems.

Velocity never tells you the answers. It asks the question that makes you find it. It finds the exact gap in your reasoning and drills it through Socratic dialogue — until you derive the insight yourself.

Start Learning Free → See how it works
Velocity · Arrays & Indexing · Vector
V
You said insertion at index 0 is O(1). Walk me through what actually has to happen in memory for that to be true.
EXPOSE
U
The element just goes into the first slot?
V
What's already sitting in that first slot — and where does it go?
RECONSTRUCT · misconception: not accounting for element shifting
U
Oh — everything else has to shift right by one. So it's actually O(n).
V
Exactly. Now — which index gives you true O(1) insertion and why?
VERIFY
The Problem

Every other tool gives you the answer.
That's why you're still stuck.

LeetCode shows solutions. YouTube explains algorithms. But none of them know why you specifically keep getting it wrong.

📺
Video explanations don't adapt
The same explanation for everyone. It doesn't know you already understand BFS but confuse it with Dijkstra on weighted graphs.
💡
Solution pages bypass thinking
Reading a solution feels like learning. It isn't. You understand it in the moment but can't reproduce it tomorrow.
🎮
Gamification teaches surface patterns
Streak mechanics optimise for daily check-ins, not deep understanding. You can ace easy Leetcode and fail a real interview.
How It Works

Teach yourself by answering questions,
not by reading answers.

Velocity uses Socratic dialogue combined with a probabilistic model that tracks your exact level of mastery per concept.

01

Pick a DSA concept

Choose from 18 nodes across the full DSA curriculum. The skill map shows your mastery per node and recommends where to start based on your prerequisites.

02

Your AI tutor asks, not tells

Vector or Aura probes your mental model with open questions. When you're wrong, they don't correct you — they ask the question that exposes the flaw in your own reasoning.

03

Mastery updates in real time

Every response updates your mastery score using Bayesian Knowledge Tracing. Wrong answers decrease it. Strong reasoning increases it. Guesses don't fool it.

04

Gaps surface automatically

When you struggle, Velocity identifies the specific misconception and routes you to the prerequisite concept that's actually missing — before you waste time on the wrong thing.

Features

Built differently
from the ground up.

🎯

Socratic Dialogue Engine

Four-phase sessions: Probe → Expose → Reconstruct → Verify. The AI never gives the answer — it asks the question that makes you find it.

🧠

Bayesian Knowledge Tracing

Every exchange updates a probabilistic mastery score. The system knows the difference between a lucky guess and genuine understanding.

🗺️

Dependency-Aware Skill Map

18 DSA concepts mapped as a prerequisite graph. The system knows you can't understand Dijkstra without Heaps and routes you accordingly.

📊

Progress Dashboard

Visual skill map with mastery arcs per node. Weakness bars by category. Every misconception from past sessions stored and surfaced.

⚡

Auto-Escalation

When mastery drops below threshold, the system surfaces the prerequisite you're missing — before you waste time on the wrong concept.

Choose Your Tutor

Two personas.
One goal: mastery.

Different learners need different pressure. Pick the coaching style that matches how you work best.

⚡
Vector
Demanding · High Standards · No Hand-Holding

Vector treats you like a FAANG interviewer treats a candidate. Direct, blunt, relentless. Wrong answers get challenged immediately.

"That's sloppy thinking. You said O(1) — walk me through the memory layout and tell me if that holds."
🌊
Aura
Patient · Scaffolded · Builds Intuition

Aura meets you where you are. When you're stuck, she simplifies. When you're close, she guides. When you get it right, she pushes deeper.

"You're on the right track. What happens to the elements already there when you insert at index 0?"
Comparison

How Velocity compares.

Feature Velocity LeetCode Khanmigo YouTube
Finds your specific misconception ✓ Yes ✗ No ✗ No ✗ No
Never gives the answer directly ✓ Yes ✗ No ✓ Yes ✗ No
Tracks mastery probabilistically ✓ BKT ✗ No ✗ No ✗ No
Voice-based coaching ✓ Yes ✗ No ✗ No ✗ No
Prerequisite-aware routing ✓ Yes ✗ No ✗ No ✗ No
Adaptive to your specific gaps ✓ Yes ✗ No Partial ✗ No

Stop reading solutions.
Start understanding them.

Free to start. No credit card. Your mastery scores persist across every session.

Start Learning Free →
Currently in beta · DSA curriculum · 18 concepts