Learn React vs Bias Drill

Learn React by building, not just watching. Interactive lessons take you from your very first component to complete, working web apps — with an AI mentor answering your questions at every step. React is the most in-demand frontend skill in the world, and this app turns it into bite-size lessons you can actually finish: read a concept, write real code, get instant feedback, move on. No video marathons. No setup. Just you, a code editor and steady progress. WHAT YOU'LL BE ABLE TO DO • Build modern web apps with components, props and state • Master React hooks — useState, useEffect and your own custom hooks • Write clean JSX and handle events, forms and lists with confidence • Manage app-wide state and share data between components • Fetch data from APIs and render dynamic, real-world content • Structure projects the way professional React developers do YOUR LEARNING PATH 1. Foundations — JSX, components, props and your first interactive UI 2. Core React — state, hooks, events, forms and conditional rendering 3. Real apps — lists and data, API calls, state management and project structure 4. Job-ready — patterns, best practices and portfolio-level projects EVERYTHING YOU NEED IN ONE APP • 85+ courses and 320+ interactive lessons, beginner to advanced • Built-in code editor — write and run real code right on your phone • AI mentor, 24/7 — stuck on a lesson? Ask anything and get a clear, personal explanation • Bite-size format — most lessons take under 5 minutes • Quizzes and coding challenges that lock in what you learn • Earn certificates as you complete courses • Learn in 20+ languages TOPICS COVERED Components · JSX · Props · State · Hooks · Events · Forms · Lists & Keys · Conditional Rendering · Context · Redux · Routing · API Calls · Performance · Best Practices WHY IT WORKS Passive tutorials fade within days. Here, every lesson is interactive: you predict, type, fix and run code from the first screen. Small daily wins beat weekend marathons — and with an AI mentor in your pocket, you are never stuck alone at 11 pm. WHO IT'S FOR • Complete beginners with a little HTML, CSS or JavaScript • Developers coming from another stack who need React fast • Students and self-taught coders building a portfolio • Anyone preparing for a frontend developer interview START FREE TODAY Download Learn React: Build Web Apps and finish your first lesson in the next five minutes. Your first course is free — the web apps you have been meaning to build are closer than you think. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://www.coddykit.com/terms/privacy-policy

Look at the chart. Call the hidden candle. See if you were right. Bias Drill trains one skill: reading which way a candle will expand off its open. Each round hides one candle — weekly, daily or 4-hour. You call it Expand bullish, Flat or Expand bearish. Then it is revealed with its open, high, low and close, how far it ran on each side, and whether your call was right. HOW A CANDLE IS GRADED The close is ignored. The drill measures how far the candle ran above its open and how far below. If one side is at least twice the other, that is the direction. Otherwise the candle is flat. You can set that band to 1.5×, 2× or 2.5×. THREE TIMEFRAMES Drill weekly, daily or 4-hour candles. Switch at the top of the market menu; each timeframe keeps its own set. MARKETS • Five simulated markets, each shaped to the behaviour of a real one: Nasdaq-100 futures, S&P 500 futures, Bitcoin and an S&P 500 ETF. A sixth option deals a random character every set. Daily and 4-hour sets carry each market's own overnight gap, measured from real data. The bars are generated on your device, so they never repeat and can't be memorised. Each set holds 520 candles, and you can deal a new one whenever you like. • Real history: EUR/USD weekly since 1999 and WTI crude oil weekly since 1986, built from public-domain Federal Reserve and EIA daily prices. These sources publish one price a day, so highs and lows come from daily closes and wicks run shorter than on an intraday chart. • Your own data: import up to 8 CSV files, such as a TradingView chart export. The timeframe is read from the file, a candle still trading when you exported is left out, and thinly traded data is flagged. BUILT FOR PRICE-ACTION TRADERS If you study ICT or Smart Money Concepts, this drills the part those ideas turn on: which side of the open a candle expands into. Read the context — liquidity resting above and below, displacement, fair value gaps, order blocks, the weekly and daily profile — then call the candle and see it graded. Bias Drill is an independent practice tool and is not affiliated with, endorsed by or associated with any trading educator or course. TRACK YOUR READING • Accuracy, total calls and your streak • A matrix of what you called against what actually happened • Your most common miss, named plainly • A log of recent calls MAKE IT YOURS • Show 26, 52 or 80 candles of context • Show or hide dates • Light, dark or system appearance • iPhone and iPad PRIVATE BY DESIGN No account, no ads and no tracking. The app makes no network calls, and files you import stay on your device. PRICING Try it free for 30 calls. A single one-time purchase unlocks the drill for good. There is no subscription, and the unlock follows your Apple Account to your other devices. Your score and streak carry over. The simulated markets are generated, not historical prices. Bias Drill is a practice tool and does not give investment advice.