An eleven-experiment high school chemistry lab visualiser! 🦷 Elephant Toothpaste — Raise the H₂O₂ concentration and KI catalyst sliders to watch foam erupt in real time. Includes a live reaction rate meter (%), a temperature gauge showing the exothermic heat release, and a full equation panel. 🌋 Baking Soda Volcano — Press the ERUPT! button on the 3D volcano to trigger a burst of CO₂ bubbles and flowing lava. Demonstrates the NaHCO₃ + CH₃COOH acid-base neutralisation reaction. 🟢 Polymer Slime — Click and drag to pull the slime blob around. PVA and borax sliders adjust cross-link density in real time, changing viscosity, elasticity, and stretchiness on the fly. 💡 Lava Lamp — Simulates density changes with a temperature slider. Heated wax becomes less dense and rises; it cools at the top, regains density, and sinks. Includes a "Like Dissolves Like" polarity guide and a density comparison chart. 🌈 pH Color Indicator — Sliding the pH scale from 1 to 14 shifts the red cabbage juice indicator through red → orange → yellow → green → blue → purple. Features seven reference test tubes and a table of everyday substances with their pH values. 🖊️ Chromatography — Solvent climbs the paper strip and separates six pigments according to their Rf values, with each band's Rf displayed live. Also covers five types of chromatography from paper to HPLC. 💎 Crystal Growing — Adjust concentration and temperature until the solution enters the supersaturated zone — crystals nucleate and grow in real time. The solubility curve marks your current state, accompanied by hexagonal crystal system graphics. ⚡ Electrolysis — Voltage and electrolyte concentration sliders control the rate of H₂ (blue bubbles) and O₂ (red bubbles) production at a 2:1 ratio. Animated electrode half-reactions and ion migration are shown inside the cell. 🔋 Fruit Battery — Click lemon, orange, apple, or potato tabs and stack cells in series to add voltages — the LED lights up once total voltage exceeds 1.5 V. Demonstrates the galvanic cell principle with half-reaction equations. 🧊 Endothermic Mix — Increasing the Ba(OH)₂ + NH₄SCN reagent amount drives the temperature down to −20°C, triggering a snowflake and frost animation. An energy profile diagram shows ΔH > 0. 🔥 Exothermic Reaction — Raising the Mg + H₂SO₄ concentration and temperature accelerates the reaction, spawning flame and spark particles. Includes an Arrhenius rate law visualisation and an energy profile diagram with activation energy marked.

A ten-concept drone explorer, dark-themed throughout! ✈️ Flight Mechanics — Four forces (Lift, Weight, Thrust, Drag) drawn as live vectors. Throttle slider controls altitude state (Ascending / Hovering / Descending), and the wind slider adds crosswind compensation arrows showing how the FC counters drift. Motor RPM gauge updates in real time. 🎮 Maneuvers — Roll, Pitch, and Yaw demonstrated side by side with clickable tiles. The main drone animates the selected axis, while the Motor Mix panel shows which motors spin faster or slower to achieve each maneuver. RC stick mapping diagram included. ⚡ Motors & Propellers — Top-down quadrotor view showing CW/CCW spin directions with animated blur. A Thrust vs RPM² curve plots current operating point. Propeller efficiency metrics (mN/W), counter-rotation torque cancellation explanation, and a full thrust/power breakdown panel. 🏖️ Beach Filming — Golden-hour coastal scene with animated waves, foam, parasols, and people on a sandy beach. Drone flies overhead with a camera FOV cone showing coverage width. Altitude slider changes the shot type automatically (Reveal → Orbit → Top-Down). Cinematic shot guide and camera tech specs (5.1K / 3-axis gimbal / ND filters). 📦 Delivery Drone — Full 4-phase delivery cycle animated over a city skyline: Takeoff → En Route → Descent → Delivery, with payload box hanging below and a ground drop confirmation. Phase timeline at the bottom, industry leader badges (Amazon, Wing, Zipline). 🗺️ Surveying & Mapping — Drone lawnmower grid-scan with blue overlay showing photographed area, overlap zones in green, and a photo counter. GSD, altitude, accuracy, and the full 7-step photogrammetry pipeline (SfM → point cloud → mesh → orthomosaic) displayed with status indicators. 🚨 Search & Rescue — Night forest scene with thermal heat signatures showing survivors as orange blobs. Drone spirals outward on an expanding search pattern; when it passes within detection range, a survivor is marked FOUND ✓ in green. FLIR specs and why thermal works through vegetation explained. 🌾 Agriculture — Three clickable modes: Crop Spraying (blue particle stream), NDVI Scan (coloured health map per field block), and Precision Seeding. Lawnmower flight path over a farm field, with stats comparing drone vs traditional tractor: 30–50% less chemical, 10× faster, one operator. 🏁 FPV Racing — Full FPV HUD with crosshair, speed readout, gate counter, and battery voltage. Drone autonomously threads five numbered gates around a track with motion blur and glow effects. Scanline overlay gives an authentic goggle feel. 5-inch race drone spec sheet included. 🎯 Military & Recon — Three modes (ISR Surveillance, Strike Simulation, Electronic Warfare) on a radar-sweep map view. MQ-9 Reaper flying wing silhouette with sensor ball. ISR shows coverage radius with target markers; strike shows trajectory arc; EW shows expanding jamming waveform. Full Reaper spec sheet (27hr endurance, 15,000m ceiling, 20m wingspan).

MULTI-VECTOR CHECK 🌐 GEO LOCATION | ipapi.co | Country, City, ISP, Timezone, Coordinates 🔤 REVERSE DNS | Cloudflare DoH PTR | Reverse DNS Hostname 📡 HTTP LATENCY | 6 fetch measurements | Min/Max/Median + Mini Bar Chart 🗂️ DNS RECORDS | Cloudflare DoH | A, AAAA, MX, NS, TXT, CNAME 📋 WHOIS / ASN | rdap.org | Network Name, Handle, CIDR / Domain Registration Info 🔌 PORT PROBE | fetch timeout detection | 80, 443, 8080, 8443, 21, 22 OPEN/CLOSED/FILTERED 🔒 DNS-over-HTTPS | Cloudflare, Google, Quad9 | DoH Response Time Comparison 🛡️ THREAT INTEL | Type Analysis | Hosting / Private / Residential ISP Classification

자동 표시 (페이지 로드 시) ✅ Public IP — IPv4/IPv6 구분, ASN·ISP 표시 ✅ 위치 — 국가 🏳️ + 도시, 지역, 시간대, 좌표 ✅ 레이턴시 — 초기 Cloudflare 핑 측정 속도 테스트 버튼 클릭 시 ✅ PING → 5회 측정 후 중앙값 / 최솟값 / 최댓값 ✅ 다운로드 → Cloudflare speed.cloudflare.com 에서 1MB → 5MB → 10MB → 25MB 순차 청크 다운로드, 스트림 중 실시간 샘플링 ✅ 업로드 → 2MB 랜덤 바이너리 4회 POST ✅ 실시간 오실로스코프 그래프 — Canvas로 직접 렌더링, Y축 자동 스케일, ✅ 글로우 라인 + 페이드 필, 리딩 닷 애니메이션 ✅ 상세 결과 테이블 — 평균/최대/측정 시각

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JSON utilities are tools and classes used to read, write, format (beautify), and validate JSON data, or to convert between objects and text in programming languages.

A nine-concept gear mechanics explorer! ⚙️ Spur Gears — The most fundamental gear type. A real-time animation shows two gears meshing and spinning in opposite directions. The contact point (red dot), pitch circles (dashed lines), and rotation arrows update instantly as you adjust the gear ratio and speed sliders. 🌀 Helical Gears — Angled teeth engage gradually for smoother, quieter operation. Drag the helix angle slider to change the spiral angle and watch the axial thrust arrows respond. A Spur vs Helical comparison table covers noise, load capacity, efficiency, and axial thrust side by side. 🔺 Bevel Gears — Redirect power through a 90° corner. Two gears mesh at a right angle in a perspective-style view. A diagram explains how the automotive differential works and why the inner and outer wheels rotate at different speeds when cornering. 🐛 Worm Gears — A worm screw drives a worm wheel. The Starts slider switches between 1 and 4 thread starts, instantly updating gear ratio, efficiency, and self-locking status. A single start = self-locking — the principle behind elevator hoists. 🪐 Planetary Gears — Gear ratio changes depending on which element (sun, ring, or carrier) is held fixed. Click the three mode buttons at the bottom to experience the logic behind automatic transmission gear selection. 📐 Rack & Pinion — Pinion rotation → rack linear travel. Alongside a car steering mechanism sketch, the linear velocity formula v = ω × R is explained with real-world examples: CNC machine axes, camera sliders, and cog railways. 📊 Gear Ratio — Raise the ratio slider: speed ↓, torque ↑. Lower it: speed ↑, torque ↓. Both are shown live through vectors and a speed-vs-torque crossover chart that visualises conservation of energy. 🔗 Compound Train — Three reduction stages spin simultaneously (4:1 × 4:1 × 4:1 = 64:1). Colour-coded shafts make it immediately clear how each stage's ratio multiplies into the total, achieving extreme reduction in a compact space.

An eight-concept game theory explorer! 🔒 Prisoner's Dilemma — The classic paradox made interactive. Click Cooperate or Betray for each prisoner and immediately see the prison sentence outcome. A live round history tracks patterns. The Nash Equilibrium cell (Betray/Betray) is permanently highlighted — rational choice leads to collectively worse outcomes. ⚖️ Nash Equilibrium — Three games with different equilibrium structures: Rock-Paper-Scissors (no pure Nash, only mixed), Battle of the Sexes (two equilibria), and Stag Hunt (two equilibria with different risk profiles). Switch between games with tabs; Nash cells pulse with a golden glow. 👑 Dominant Strategy — The advertising duopoly shows why firms always advertise even when both would profit more if neither did. Step-by-step Iterated Elimination of Dominated Strategies (IEDS) is laid out as a four-step flowchart. ⚔️ Zero-Sum Games — A 4×4 military payoff matrix with click-to-inspect cells. A saddle point is automatically found and highlighted. A live pie chart shows the zero-sum constraint visually — one player's gain is always the other's loss. The Minimax Theorem is shown numerically. 🧬 Evolutionary Game Theory — A live population simulation of Hawks vs Doves competing over generations. Watch the population chart evolve in real time as natural selection finds the Evolutionarily Stable Strategy (ESS). Mutation slider introduces randomness; a fitness comparison shows which strategy is currently winning. 🏷️ Auction Theory — Compare all four standard auction formats side by side: English, Dutch, First-Price Sealed, and Vickrey (Second-Price). Bid bars show true values vs actual bids, winner's surplus, and price paid. The Winner's Curse and Revenue Equivalence Theorem are explained with context. 🤝 Bargaining Game — An animated pie that responds to split and patience sliders in real time. The Rubinstein alternating-offers formula calculates the mathematically predicted split based on patience. The Ultimatum

A nine-concept fluid mechanics explorer! 💧 Fluid Properties — Click any of the five fluids (air, water, engine oil, honey, blood) to see viscosity and density change in real time, with the particle motion inside the container responding accordingly. Pressure arrows show how hydrostatic pressure increases with depth. 📊 Pascal's Law — Press the PUSH button to transmit a small piston force to a much larger piston, lifting the car. The formula F₂ = F₁ × (A₂/A₁) is computed live. This is the principle behind car brakes, hydraulic lifts, and excavators. 🌀 Bernoulli's Principle — As the pipe narrows in the middle, airspeed rises and pressure drops — visualised through pressure gauges and particle colour. P + ½ρv² = constant. 🔄 Continuity Equation — A₁v₁ = A₂v₂. Drag the pipe cross-section slider and watch flow velocity automatically increase at the narrow section. Particle colour shifts from blue (slow) to red (fast). 〰️ Laminar vs Turbulent — Slide the Reynolds Number to switch between laminar flow (Re < 2300, smooth parallel blue streams), the transitional zone, and turbulent flow (Re > 4000, chaotic red mixing). In laminar mode, the parabolic velocity profile is drawn across the pipe. 🚗 Drag & Lift — Streamlines above and below the airfoil are drawn in real time (blue = high pressure, red = low pressure), and the lift and drag force vectors update as you adjust angle of attack and speed. Includes a drag coefficient comparison by shape (flat plate 1.17 → airfoil 0.012). 🔩 Pipe Flow — Calculates frictional head loss using the Darcy-Weisbach equation (h_L = f·L/D·v²/2g). Diameter, length, and velocity sliders instantly update Reynolds number, friction factor f, and total head loss. ⚙️ Pumps & Turbines — Four machine types: centrifugal pump (spinning impeller), axial turbine (hydropower), Pelton wheel (impulse turbine), and a pump-system curve graph (showing the operating point). RPM slider adjusts rotational speed. 🌍 Real World — Four detailed case studies with equations and animations: aircraft wing (2.7 MN of lift), ship hull (Archimedes buoyancy), blood circulation (non-Newtonian, pulsatile flow), and wind turbines (Betz limit: 59.3% maximum extractable power).

개발자용 네이밍 케이스 8종 camelCase · PascalCase · snake_case · SCREAMING_SNAKE · kebab-case · UPPER-KEBAB · dot.case · path/case 특수 변환 13종 전각/반각 · 스몰 캡스 · 위/아래 첨자 · 취소선 · 밑줄 · 버블 텍스트 · 사각 텍스트 · 모스 부호 · 이진수(ASCII) · ROT13 추가 도구 • 텍스트 정리: 공백 제거, 빈 줄 제거, 중복 줄 제거, 줄 정렬, 줄 번호 추가/제거, 텍스트 뒤집기, 섞기 • 찾아 바꾸기: 정규식 지원, 대소문자 구분, 자주 쓰는 패턴 퀵버튼

Pre-algebra is a common name for a course taught in middle school mathematics in the United States, usually taught in the 6th, 7th, 8th, or 9th grade.

AI 정규표현식 Generator & Tester

|카테고리 |단위 수|특이 단위 | |-----|----|----------------------| |📏 길이 |13개 |광년, 천문단위, 해리 포함 | |⚖️ 무게 |8개 |한국 근 포함 | |🌡️ 온도 |4개 |섭씨·화씨·켈빈·랭킨 (별도 공식 적용)| |🗺️ 넓이 |12개 |평(한국) 포함 | |🧪 부피 |13개 |갤런, 쿼트, 컵 | |🚀 속도 |7개 |마하, 광속 포함 | |⏱️ 시간 |10개 |나노초까지 | |💾 데이터|11개 |SI(KB)와 이진(KiB) 구분 | |🔵 압력 |9개 |atm, bar, psi, mmHg | |⚡ 에너지|9개 |kcal, kWh, eV, BTU | |📐 각도 |6개 |라디안, 그라디안, 분·초 | |🍳 요리 |10개 |한국 컵(200mL)/큰술/작은술 별도 |

✍️ 입력 상단 고정 입력창 — 스크롤해도 항상 위에 있음 #태그 입력 시 실시간 자동완성 드롭다운 (기존 태그 목록 + 사용 횟수) ★ 중요 표시 6가지 컬러 라벨 (왼쪽 테두리 색상으로 구분) ⌘Enter / Ctrl+Enter 단축키 저장 🗂 관리 카드 hover 시 편집 / 고정 / 삭제 버튼 노출 인라인 편집 (카드 안에서 바로 수정) 📌 고정 메모 항상 상단 배치 긴 메모 자동 접기 + "더 보기" 모달 🔍 탐색 상단바 실시간 검색 전체 / 고정 / 중요 탭 필터 태그별 필터 (태그 클릭으로 토글) 최신순 / 오래된순 / 가나다순 정렬 📊 통계 전체 / 고정 / 태그 종류 / 중요 표시 수 실시간 집계 🎨 UX 다크모드 토글 (상태 기억) 새 카드 슬라이드 인 애니메이션 모바일 FAB 버튼 (✏️) txt 파일 내보내기 localStorage 영구 저장

✅ 피커: RGB 슬라이더 + HEX 직접 입력 + HSL 변환 표시 ✅ 팔레트 생성: 보색·유사색·3색·4색·모노크롬·랜덤 자동 생성 ✅ 팔레트 뷰어: 큰 스트립 + 개별 카드 (클릭 복사) ✅ 색상 정보: HEX / RGB / HSL / HSB / CMYK 동시 표시 ✅ 저장: localStorage 팔레트 북마크 ✅ 내보내기: CSS 변수 / Tailwind config / JSON

✅ RDAP API (Verisign 공식) — 완전 무료, 인증 불필요, CORS 허용 ✅ 등록일 / 최종수정일 / 만료일 / 등록기관 / 네임서버 표시 ✅ 만료 90일 이내면 노란색 ⚠ 경고 표시 ✅ 미등록 도메인은 별도 메시지로 구분 ✅ 최근 조회 이력 칩 (localStorage) ✅ 총 70개 TLD 지원, 각 TLD마다 공식 RDAP 엔드포인트 매핑 Generic: .com .net .org .info .biz 등 New gTLD: .app .dev .io .ai .shop .tech .blog 등 ccTLD: .kr .jp .de .uk .cn .fr .au 등

🚀 Launch — A full liftoff sequence with all three stages. The shuttle rides its 3 main engines and 2 SRBs off the pad, the SRBs separate at +2 minutes, and the External Tank drops at ~120km altitude. An altitude bar tracks the climb through the troposphere, stratosphere, mesosphere, and thermosphere with real smoke and exhaust particle effects. 🌍 Reaching Orbit — Shows why orbit is not "escaping" gravity but rather falling so fast that Earth curves away beneath you. Three trajectory paths illustrate the difference between too slow (falls back), just right (stable orbit at 7.8 km/s), and escape velocity (11.2 km/s). The orbiting shuttle has its live velocity and gravity vectors drawn in real time. 🌌 Hohmann Transfer — An animated solar system view with Earth and Mars in their orbits. The shuttle fires Burn #1 to enter the half-ellipse transfer orbit, coasts 259 days, then fires Burn #2 at Mars to circularise. The most fuel-efficient path between two planets — no engine during the 9-month coast. 🪐 Gravity Assist — A probe approaches Jupiter and curves around it, exiting faster than it entered — no fuel burned. The speed vector grows visibly as the probe swings around the gravity well. Used by Voyager, Cassini, and New Horizons to reach the outer solar system. 🔥 Re-entry — The shuttle descends through the atmosphere layers with real plasma heating effects. A temperature gauge shows the heat shield reaching 1,650°C. The entry corridor is narrow: too steep burns the shuttle up, too shallow and it bounces off the atmosphere. 🛬 Landing — Unpowered glide at a 22° angle (7× steeper than a 747) at 350 km/h. Landing gear deploys automatically on approach. The drag chute fires after touchdown. One shot, no go-around — if the approach is wrong, there is no second chance. 🗺️ Full Mission — All 10 phases of a complete Earth→Mars→Earth mission play out on a solar system map: Launch → Earth orbit → Burn 1 → 9-month transfer → Mars arrival → Mars operations → Return burn → 9-month return coast → Re-entry → Landing. To

A seven-concept fireworks explorer! 🎆 Live Show — A full nighttime display over a city skyline with water reflections. Click anywhere in the sky to launch a firework. Shells leave glowing trails and burst into hundreds of particles. Auto-rate and gravity sliders let you adjust the show. 🚀 Launch Physics — Watch the projectile motion of a single shell. Real-time velocity and gravity vectors are drawn on the shell as it rises. A dashed trajectory prediction shows where it will go, and the burst point at peak altitude is marked. Includes the equations: y = v₀sinθ·t − ½gt². 💥 Burst Patterns — Six distinct shell types to explore: Peony (uniform sphere), Chrysanthemum (trailing stars), Ring/Kamuro (flat disc), Willow (long drooping tails), Spider (sharp radiating legs), and Palm (thick arcing arms). Click a type to switch; click the canvas to burst. 🎨 Color Chemistry — Click any element on the periodic table grid to see its flame color, the metal salt compound used, combustion temperature, and emitted wavelength. An animated electron orbital diagram explains why each element produces a unique color. ⚗️ Explosion Physics — Animates the three-phase lifecycle: shell rises on the lift charge → burst charge explodes with a visible shockwave → stars scatter and burn as they fall. A cross-section diagram shows the four internal layers of a shell. Includes the governing equations (PV=nRT, F=ma, E=hc/λ). ✨ Trail & Sparkle — Focuses on the individual burning "star" pellets. A timeline bar shows the ignition → peak brightness → fade → burnout progression. Sliders control burn time, star size, gravity, and air drag to show how each factor shapes the visual trail. ⏱️ Shell Timing — Shows how sequential electronic delay fuses create synchronized displays. A timing diagram plots each shell's launch and burst window. Click FIRE to launch the sequence and watch the shells go off one by one on their programmed schedule.

⚖️ Four Forces — Arrows show all four forces acting on the aircraft: Lift (up), Weight (down), Thrust (forward), and Drag (backward). Adjust the Thrust and Weight sliders to see the status switch between Climbing, Level flight, and Descending in real time. 💨 Bernoulli's Principle — Visualizes how airspeed increases and pressure drops as the pipe narrows in the middle. Pressure gauges and flow particles make the "Speed↑ = Pressure↓" relationship immediately intuitive. 🔺 Wing Cross-Section (Airfoil) — The convex upper surface makes air flow faster (green) while air beneath moves slower (blue). That pressure difference is what generates lift. 📐 Angle of Attack — Adjust the wing tilt slider and watch a real-time graph show how lift changes with angle. A stall warning appears when the angle exceeds 15°. ⚠️ Stall — When the angle of attack exceeds 16°, airflow separates from the wing and lift drops sharply. The stall is visualized with a turbulent flow animation showing the detachment in real time. 🛫 Takeoff Simulation — Advance the throttle to build speed. The moment it exceeds 80 km/h, lift overtakes weight and the aircraft actually lifts off. The instrument panel shows speed, altitude, lift, thrust, and flight status live. 🌀 Coandă Effect — Air clings to and follows the curved surface of a cylinder. The same principle applies to the convex upper surface of a wing: air bends downward along the surface, and by Newton's third law the wing is pushed upward.