Changelog

What we shipped, when.

May 1, 2026

feat

Rebrand to TorchedUp + new torch logo

"Torched" in orange-600, "Up" in slate-900; new flame icon
New hero: "From softmax to LLMs"
162+ hands-on problems live
Refreshed OG image card to match the new brand

feat

Stripe Customer Portal self-serve

Premium users can manage and cancel subscriptions from their profile
No more emailing support to change billing details

feat

User progress on Supabase (with RLS)

Solved-problem history now persists across devices and sessions
Row-level security so your progress stays yours

April 28, 2026

feat

Numerical gradient-check problem (#182)

Central-difference gradient verification — catch backprop bugs the way real engineers do

fix

Test-case fixes across 20 problems

Tightened multi-head attention tolerance to 1e-5 with corrected hand-computed expected values
Repaired 7 Wave 1-3 foundation problems flagged by the new test runner
Repaired 8 mid-stack problems and 5 Wave 4+5 problems

April 22, 2026

feat

Interactive landing page demo

Run a real numerically-stable softmax problem in your browser before signing up
Test verification baked in — see green checks immediately
Powered by Pyodide, no server round-trip

feat

Coming Soon teasers for ML & Inference System Design

New surface area announced for upcoming system-design tracks
Internal test runner script for problem authoring

feat

Anti-abuse: 100/day Modal GPU cap per user

Per-user daily ceiling on Modal GPU runs to keep the platform sustainable

April 15, 2026

feat

Empty states for streaks and activity calendar

Friendlier first-run experience for users who haven’t solved a problem yet

feat

Math merged into Description tab

Equations now read inline with the problem statement instead of hiding behind a tab

feat

Navbar profile link + paginated problem list

Click anywhere on a problem row to open it
Faster scanning with paginated lists instead of a long scroll

fix

Auth row-write reliability + Supabase PKCE cookies

Switched to @supabase/ssr browser client so the OAuth PKCE cookie shares correctly
Hardened the user-row insert path so first sign-ins always create a row

April 8, 2026

feat

Wave 4+5 problem expansion (97 → 170)

PEFT: LoRA, adapters, QLoRA dequant
RLHF: PPO, DPO, GRPO, Bradley-Terry, GAE
RAG: BM25, cosine retrieval, RRF, MMR
Eval: BLEU, ROUGE-L, perplexity, ECE, pass@k
ML systems: memory math, KV cache budgets, all-reduce comparisons
Six new categories: systems, peft, rlhf, rag, eval, embeddings

chore

Cleaned up reference links

Replaced Stanford / CS231n links with stable Wikipedia references
Reset acceptance rates to 0% ahead of the public launch

April 1, 2026

feat

Launch-ready legal pages + cookie consent

Terms of Service, Privacy Policy, and Refund Policy
Cookie consent banner with privacy-preserving defaults

Changelog

What we shipped, when.

May 1, 2026

feat

Rebrand to TorchedUp + new torch logo

"Torched" in orange-600, "Up" in slate-900; new flame icon
New hero: "From softmax to LLMs"
162+ hands-on problems live
Refreshed OG image card to match the new brand

feat

Stripe Customer Portal self-serve

Premium users can manage and cancel subscriptions from their profile
No more emailing support to change billing details

feat

User progress on Supabase (with RLS)

Solved-problem history now persists across devices and sessions
Row-level security so your progress stays yours

April 28, 2026

feat

Numerical gradient-check problem (#182)

Central-difference gradient verification — catch backprop bugs the way real engineers do

fix

Test-case fixes across 20 problems

Tightened multi-head attention tolerance to 1e-5 with corrected hand-computed expected values
Repaired 7 Wave 1-3 foundation problems flagged by the new test runner
Repaired 8 mid-stack problems and 5 Wave 4+5 problems

April 22, 2026

feat

Interactive landing page demo

Run a real numerically-stable softmax problem in your browser before signing up
Test verification baked in — see green checks immediately
Powered by Pyodide, no server round-trip

feat

Coming Soon teasers for ML & Inference System Design

New surface area announced for upcoming system-design tracks
Internal test runner script for problem authoring

feat

Anti-abuse: 100/day Modal GPU cap per user

Per-user daily ceiling on Modal GPU runs to keep the platform sustainable

April 15, 2026

feat

Empty states for streaks and activity calendar

Friendlier first-run experience for users who haven’t solved a problem yet

feat

Math merged into Description tab

Equations now read inline with the problem statement instead of hiding behind a tab

feat

Navbar profile link + paginated problem list

Click anywhere on a problem row to open it
Faster scanning with paginated lists instead of a long scroll

fix

Auth row-write reliability + Supabase PKCE cookies

Switched to @supabase/ssr browser client so the OAuth PKCE cookie shares correctly
Hardened the user-row insert path so first sign-ins always create a row

April 8, 2026

feat

Wave 4+5 problem expansion (97 → 170)

PEFT: LoRA, adapters, QLoRA dequant
RLHF: PPO, DPO, GRPO, Bradley-Terry, GAE
RAG: BM25, cosine retrieval, RRF, MMR
Eval: BLEU, ROUGE-L, perplexity, ECE, pass@k
ML systems: memory math, KV cache budgets, all-reduce comparisons
Six new categories: systems, peft, rlhf, rag, eval, embeddings

chore

Cleaned up reference links

Replaced Stanford / CS231n links with stable Wikipedia references
Reset acceptance rates to 0% ahead of the public launch

April 1, 2026

feat

Launch-ready legal pages + cookie consent

Terms of Service, Privacy Policy, and Refund Policy
Cookie consent banner with privacy-preserving defaults