White RoomNEW
July 2026

Collections, the Dan Ladder, and a shared White Room

White Room
  • Shared free preview room so anyone can see the coach in action before subscribing.
  • Coaching questions now run on a dedicated turn tier for sharper answers at lower cost.
Roadmap & Practice
  • Problem collections: build favorites, redo, and review lists with a progress tracking table.
  • Verified Dan Ladder: ten dans of curated AtCoder problems, link your account to earn the rank on your profile.
  • Import problems by URL from CSES, AtCoder, Codeforces, and USACO straight into your collections.
Mock Interview & Intel
  • Animated mock interview demo on the landing page.
Rewards & Cosmetics
  • Blackjack table: bet your coins against a server-dealt shoe.
  • Global sound system with a volume setting plus solve, quiz, and reward cues.
  • Theme-integrated rarity tokens and a vault-terminal box opening animation.
Platform
  • Faster profile and problem pages from leaner database hot paths.
  • Sandbox judge failures reliably fall back to Judge0 with no raw error leaks.
June 2026

White Room goes public

White Room
  • White Room opened to every signed-in user, with a premium access boundary.
  • Structured onboarding wizard grounds your very first plan in real goals.
  • Projects tab: personalized project recommendations with mini schedules.
  • Async background plan builds: get an instant room and resume when it is ready.
  • Native web search with citations on direct questions, plus learner-memory dedup so the coach stops repeating itself.
Roadmap & Practice
  • Level-ordered list view for the algorithm roadmap.
Problems & Editor
  • Vercel Sandbox execution provider for problem runs, with address sanitizer support and warm sandbox reuse for faster submissions.
  • Syntax-highlighted submitted and solution code.
Mock Interview & Intel
  • Animated product tour showcase on the homepage.
Resume Reviewer
  • Private-by-default reports with revocable share links and delete.
  • Recalibrated scoring with percentile bands and a breadth blend, shown on an interactive score curve.
Guides
  • Guides section: consolidated, rewritten, and published, with a right-rail table of contents and scroll-spy.
  • In-product admin markdown editor with author bylines, descriptive slugs, and draft mode.
Rewards & Cosmetics
  • Reward popups for every XP source, with coins you can spend in the shop.
Membership
  • Five-day premium trial with card-reuse abuse prevention.
  • Native cancel and reactivate flow with a monthly and annual billing toggle.
Profile & Community
  • Account settings to change your email and password.
  • Following page with mutuals, and AtCoder account linking from settings.
Platform
  • Connection-pool starvation that slowed the whole site under load.
  • Baseline security response headers.
May 2026

The AI coach takes shape

White Room
  • AI coaching workspace: an adaptive roadmap you build together with the coach.
  • Infinite hex-grid roadmap with day-structured plans.
  • Session artifacts and durable learner memory.
  • Context sources: feed the coach your linked profiles and files.
Roadmap & Practice
  • Library: a curated hub of the best DSA and system design resources.
Mock Interview & Intel
  • Rebuilt mock interview suite: structured rounds with transcription.
  • Candidate rating radar with hoverable scores.
  • Job board search.
Rewards & Cosmetics
  • Referral system: a five-tier ladder with gacha gift boxes.
Profile & Community
  • Ranking v2 and profile progression.
  • Leaderboard stats redesigned into stat cards, plus contributor cards on the community page.
Platform
  • Migrated every LLM call from Anthropic to OpenAI.
April 2026

WhiteBox launches

Roadmap & Practice
  • DSA algorithms roadmap with an admin editor.
  • FAANG vs Cracked roadmap tier toggle.
  • "Plan with AI" button on the algorithm roadmap.
  • Workbooks: your first custom problem lists.
  • Per-problem discussion threads.
Problems & Editor
  • Coding problems, a code editor, and Judge0 execution.
  • Multi-language support with dynamic per-language harnesses, including C++20 and C++23.
  • Tsuki: the in-editor AI problem assistant, with a Monaco editor and inline diff highlights.
  • Custom test cases with an execute button.
  • ZIP file test-case uploads and batched Judge0 submissions.
  • Vim mode, per-problem time and memory limits, and more languages.
  • Submission speed histogram.
  • LeetCode catalog and an auto-save queue.
  • Submission rate limiter.
Mock Interview & Intel
  • Structured mock interviews with multiple round types and speech recording.
  • System design whiteboard for architecture rounds.
  • Interview question buckets.
  • Interview Intel: a feed of real interview reports with a review pipeline and a contribute flow.
  • Our Philosophy manifesto page.
Resume Reviewer
  • AI resume reviewer, with shareable report URLs and a free tier.
  • Percentile ranking against the pool with seven recruiter signals, plus an admin panel with one-click backfill.
Domain Knowledge
  • Domain knowledge quizzes, with mass upload and AI drafting modes for authoring.
Rewards & Cosmetics
  • Loot boxes, avatar frames, and a cosmetics shop with an editor for animated titles.
Membership
  • Stripe payments, coupons, and bulk premium gifting.
Profile & Community
  • Profiles with the hexagon power graph, PP scoring, and a leaderboard.
  • Community pages, contributors, and public profile routes.
  • Growth dashboard for admins, first-solve bonuses, and a solvers tab.
Platform
  • Clerk authentication, an admin panel, and separate production and dev environments.
  • Job board, notifications, and direct messages.
  • Granular permissions system and search-engine optimization across the site.