The Second Brain for LeetCode

Never Forget Another
Solved Problem.

ALGONEX helps you revise LeetCode problems with intelligent spaced repetition, so you remember what you solved and stay ready for coding interviews.

1-Click Import
No Extension Needed
100% Private & Local
ALGONEX Showcase
INTERACTIVE WORKFLOW SIMULATOR

Why 82% of solved problems
vanish before your interview

Day 1
100% Recall
Day 7
60% Fading
Day 14
35% Critical
Day 30
18% Forgot
ALGONEX AUTOMATED MEMORY ENGINE

Optimal Spaced Repetition Cycles

Retention: 98.4% Permanent
Interactive Spaced Review Queue
0/3 Reviewed Today
Box 3 (Day 7)Hard

Binary Tree Maximum Path Sum

Box 4 (Day 14)Hard

Merge K Sorted Lists

Box 2 (Day 3)Med

Course Schedule II

🎯 Interview Outcome: Instant Pattern Recognition✨ Zero Burnout Guaranteed
🎯 ALGONEX KNOWLEDGE CLUSTERHover bubble to inspect
Arrays
General
Strings
Linked List
Matrix
Math/Bits
Trees
Sorting/Search
Binary Search
Sliding Window
DP
Unknown
Stack

ALGONEX

Revise Smarter. Code Better. Master DSA.

Your intelligent LeetCode revision platform to track, revise and master Data Structures & Algorithms.

Arrays
Linked List
Stacks
Queues
Trees
Graphs
DP

... and more

NeetCode
AlgoExpert
TUF (Striver)
NeetCode
AlgoExpert
TUF (Striver)
NeetCode
AlgoExpert
TUF (Striver)
NeetCode
AlgoExpert
TUF (Striver)
LeetCode
CodeChef
HackerRank
Codeforces
GeeksForGeeks
LeetCode
CodeChef
HackerRank
Codeforces
GeeksForGeeks
LeetCode
CodeChef
HackerRank
Codeforces
GeeksForGeeks
LeetCode
CodeChef
HackerRank
Codeforces
GeeksForGeeks
AlgoNEX
Daily Goals
Streaks
Revision Plan
Notes
Bookmarks
Dark Mode
The Memory Decay Calculator

Every Day You Don't Revise, Your Code Dissolves

Test what happens to a solved LeetCode Hard problem (146. LRU Cache) as days pass without scheduled spaced repetition.

146. LRU CacheMedium
Clarity: 15% — Severe Memory Decay
class LRUCache {
  // ⚠️ CAUTION: SEVERE MEMORY DECAY DETECTED
  // [CRITICAL ERROR]: Solution logic completely dissolved.
  // ✖ Result: Would fail technical interview & live coding.
  //  Action Required: Immediate Spaced Repetition Needed.
}
⚠️ CAUTION: Severe Memory Decay — Solution 85%+ dissolved! High interview fail risk.
Without ALGONEX: Memory drops 80%+ by Day 14With ALGONEX: 15-min daily review preserves 96%+ intuition

Memory Retention Over 30 Days

Hover/click nodes to explore
Unrevised (18%)
ALGONEX (96%)
100%75%50%25%Day 1Day 3Day 7Day 14Day 30
Day 14

Review 3 (2 min): Neural pathways locked for interview speed.

Unrevised: 22%ALGONEX: 96%
Cognitive Science

The Science Behind Never Forgetting

Hermann Ebbinghaus proved human memory decays exponentially within 48 hours. ALGONEX uses algorithmically timed spaced reviews to turn temporary memory into permanent intuition.

⏱️
Only 15 minutes per dayMaintains 96% retention across 100+ solved problems with algorithmically timed reviews.
Product Experience

Inside The Second Brain

"Everything you've solved."

algonex.me/dashboard
Solved123
Due Today5
Memory94%
Streak14 🔥
Click tabs above to explore
Interactive Features

Every Feature Demonstrates Itself

No marketing fluff. Interact with live mini-demos of the core technology powering your Second Brain.

Live Engine

Client-Side Auto Sync

Pings LeetCode's public API directly from your browser. Zero middleman servers or Chrome extensions.

API StatusConnected
Last: 146. LRU Cache
Auto Classify

Smart Topic Tagging

Automatically categorizes into Graph, DP, Tree, Array memory buckets for targeted reviews.

Dynamic ProgrammingTrees & GraphsTwo PointersSliding Window
Instant Setup

Historical Import

Import your entire LeetCode submission history in seconds via JSON export or Web API.

history.json123/123
Zero Overhead

No Extensions

No Chrome extensions consuming RAM or requesting permissions across all tabs.

RAM Cost0 MB
AccessNone Needed
Product Walkthrough

Watch The ALGONEX Launch Trailer

See how 1-click import and automated spaced repetition work in under 60 seconds.

ALGONEX Video Walkthrough
Play Demo Video
FAQ

Clear Answers

Everything engineers ask about the ALGONEX Second Brain.

ALGONEX connects directly to LeetCode's public GraphQL API using standard web requests or via a 1-click JSON export. No intrusive background extensions needed.

Your Next Interview Is Closer Than You Think

Every day without ALGONEX is another day of solved problems fading from memory. Start building permanent pattern recall today.

Free Forever
No Credit Card
100% Private