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Learning & Reference
313 appsLearning & Reference: Learning Quests
Word data · CheckSpelling Spellbook Quest for KidsRead a friendly clue, type the hidden word, and use a sound-part hint when you need help.Text · CheckStudy Potion Focus Timer for KidsChoose a short focus quest, use the big timer, and mark the session done when it is time to rest.Word data · CheckVocabulary Treasure Hunt for KidsFind six word treasures by choosing the word that fits each clear, fifth-grade-friendly meaning.
Learning & Reference: Letters & Numbers
Learning & Reference: Light & Twilight
Coordinates · CalculateAstronomical Darkness PlannerFind when astronomical night starts, ends, and reaches its darkest point.Coordinates · CalculateBlue Hour CalculatorEstimate morning and evening blue hour using the sun's minus 8 to minus 4 degree range.Coordinates · CalculateCivil Twilight PlannerFind the morning and evening civil-twilight windows around sunrise and sunset.Coordinates · CalculateDaylight Length CalculatorCalculate daylight, night length, sunrise, and sunset for a date and place.Coordinates · CalculateNautical Twilight PlannerFind when nautical twilight begins and ends before dawn and after dusk.Coordinates · CalculateTwilight Times CalculatorList astronomical, nautical, civil, sunrise, sunset, and night times in order.
Learning & Reference: Maps & Directions
Learning & Reference: Maps & Geography
Quiz · CheckContinent Coloring Map MakerChoose a continent, color every country shape in it, and print the map.Quiz · CheckCountry Size Comparer for KidsPut two country outlines side by side and see which map shape takes up more space.Quiz · CheckWorld Map Explorer for KidsPick a country, see it light up on the map, and learn its capital and languages.
Learning & Reference: Math & Dot Art
Art · GenerateBinary Dot Picture MakerSee how rows of zeros and ones can switch dots off and on to draw a tiny picture.Art · GenerateDot Coordinate Grid ExplorerMove around a 16 by 16 dot grid and see the x, y, and index number for every spot.Art · GenerateTimes Table Dot Art MakerPick a times table and watch its products light up as a colorful dot pattern.
Learning & Reference: Math & Science
Report / CSV · ConvertAC Impedance Teaching LabExplore how resistors, coils and capacitors affect an AC circuit. Compare series and parallel circuits at a chosen frequency.Worksheet JSON · ConvertCalculus Expression HelperFind a derivative or integral of a supported expression. Compare the formulas and check the result at a chosen value.JSON / SVG · ConvertComplex Number WorkbenchCalculate with complex numbers such as 3 + 4i. See the answer on a graph and compare its distance and angle.CSV / SVG · ConvertDescriptive Statistics DeskSummarize number columns in a CSV file. See averages, ranges, missing values and a chart of how the values are spread.Report / CSV · ConvertFraction Worksheet CheckerCheck fraction sums and answers. See common-denominator steps and simplified fractions for each line of your worksheet.JSON · ConvertLinear Systems WorkbenchSolve a system of linear equations in the form Ax = b. See the solution and how closely it fits each equation.JSON · ConvertMatrix LaboratoryMultiply, transpose or invert matrices. Check their size and see warnings when a calculation may be unstable.Worksheet JSON · ConvertPolynomial Exploration DeskExpand and factor polynomials. Find a derivative and calculate the value of an expression at a point you choose.JSON · ConvertPrecision Decimal CalculatorCalculate with long decimal numbers. Choose the precision and compare the answer with a standard computer calculation.JSON / SVG · ConvertProbability Distribution ExplorerExplore probability distributions with charts. Change the settings and see how the curve and chances change.Report / CSV · ConvertRecipe Fraction ScalerScale a recipe up or down with exact fractions. Keep each ingredient and unit beside its new amount.Report / CSV · ConvertRounding Method DemonstratorCompare nine ways to round numbers. See what happens with negative numbers and values exactly halfway between two choices.Notebook JSON · ConvertScientific Calculator NotebookSolve calculations in a reusable notebook. Name values, use units and matrices, and use earlier answers in later lines.Report / CSV · ConvertStatistical Test WorkbenchRun a t-test to compare averages. Choose one sample, paired measurements or two groups, then review the results and assumptions.Worksheet JSON · ConvertSymbolic Algebra WorkbenchSimplify, expand or factor an algebra expression. Compare the new form with the original and check a sample value.Worksheet JSON · ConvertSymbolic Computation WorksheetWork through several algebra or calculus steps in order. Review each result and download the full worksheet.JSON / SVG · ConvertTangent-line VisualizerDraw a function and its tangent line. Move a point along the curve to see how the slope and line equation change.Formula JSON · ConvertUnit-aware Formula CalculatorMake a formula with named inputs and units. Change the measurements, calculate again and save the formula for later.
Learning & Reference: Minecraft Learning
Quiz · CheckMinecraft Biome Explorer for KidsPick a biome and learn its climate, temperature, precipitation, category, and dimension.Quiz · CheckMinecraft Block Facts Explorer for KidsPick a block and see its hardness, light, stack size, transparency, and best tool.Quiz · CheckMinecraft Block Hardness ComparerPut two blocks side by side and see which one is easier or harder to break.Quiz · CheckMinecraft Crafting Recipe Helper for KidsChoose a familiar item and see the ingredients in a clear three-by-three crafting grid.Quiz · CheckMinecraft Enchantment Explorer for KidsChoose an enchantment and see its highest level, item group, treasure flag, and trade flag.Quiz · CheckMinecraft Food Points Explorer for KidsPick a food and see how many food points it gives and how many fit in one stack.Quiz · CheckMinecraft Light Level Explorer for KidsSee how much block light comes from a torch, lantern, glowstone, and other bright blocks.Quiz · CheckMinecraft Mob Size Comparer for KidsChoose two mobs and compare their data-sized shapes from a tiny bee to a tall Enderman.Number · CheckMinecraft Stack Calculator for KidsTurn any item count into full stacks, extra items, and the number of inventory slots needed.
Learning & Reference: Moon Planning
Coordinates · CalculateMoon Photography PlannerCombine moon position, rise and set times, lit percentage, and phase for one shot time.Coordinates · CalculateMoon Position CalculatorCalculate moon altitude, compass direction, distance, and parallactic angle at one time.Coordinates · CalculateMoonrise & Moonset CalculatorCalculate local moonrise, moonset, and all-day horizon status for a place and date.Coordinates · CalculateSun & Moon Daily TimelineCreate one ordered local timeline for dawn, sun, twilight, moonrise, and moonset.
Learning & Reference: Museums & Art
Art · GenerateArt History Time Traveler for KidsSlide from ancient Egypt to the 1900s and uncover one museum object at a time.Art · GenerateArt Materials Explorer for KidsCompare paint, metal, clay, jade, wood, cloth, feathers, and other art materials.Art · GenerateMet Museum Object Explorer for KidsMeet cats, dragons, masks, paintings, toys, and more from the Met collection.
Learning & Reference: Painting & Drawing
Learning & Reference: Piano Practice
Audio · GenerateFind Middle C Piano Practice for KidsPractice finding middle C on a wide piano without a printed answer on the key.Audio · GenerateLearn-a-Melody Piano Trainer for KidsFollow clear note clues on a real touch piano until you can play the whole tune.Audio · GenerateLeft and Right Hand Piano Practice for KidsFollow simple hand clues while low and high piano notes take turns.
Learning & Reference: Reading Practice
Learning & Reference: Routes & Geography
GPX · ConvertGPX Metadata InspectorInspect tracks, points and times in a GPX file. Check recorded heights and approximate distance without uploading your route.GPX · ConvertGPX Segment ExporterExtract one recorded track segment from a GPX file and save it as a new GPX document.GPX / CSV · ConvertGPX Waypoint ExporterExtract GPX waypoints into a CSV with names, coordinates, elevations, and timestamps.
Learning & Reference: Science Supports
SVG · GenerateAtom Motion Model for KidsExplore a simple helium, carbon, or neon model with moving dots and clear pause controls.Art · GenerateNature Outline Tracer for KidsOpen a clear nature picture and turn its strongest edges into a simple outline for a study page.SVG · GenerateScience Diagram Drawing Animator for KidsAnimate a water cycle, plant-parts picture, or simple circuit one useful line at a time.Art · GenerateScience Observation Sketchbook for KidsSketch a leaf, the Moon, or your own object, then circle details and add questions or notes.Art · GenerateScience Process Animator for KidsShow a seed growing, a water drop moving, or moon phases changing in a few clear frames.SVG · GenerateScience Process Stop-Motion for KidsCapture a safe paper or clay model step by step to explain plant growth, cycles, or states.Art · GenerateWeather Journal Animation for KidsPut local sky pictures or weather cards in order and watch clouds, rain, and sunshine change.Art · GenerateWeather Loop Animator for KidsBuild a short repeating sky scene with a drifting cloud, falling drops, or soft snowflakes.
Learning & Reference: Scientific File Services
CSV · ConvertAstronomical Coordinate ConverterConvert sky coordinates between equatorial, Galactic and ecliptic systems. Choose the reference settings and download the new coordinates.FITS / ZIP / CSV / PNG · ConvertFITS File ExplorerOpen a FITS astronomy file. Read its headers, preview image data and download selected table rows with a report.
Learning & Reference: Sound Science
Audio · GenerateChord Pitch Shift Lab for KidsSend a whole three-note chord through real multi-tone pitch shifting.Audio · GenerateHarmonic Series Explorer for KidsHear a starting tone and its first whole-number frequency multiples.Audio · GenerateInstrument Room Sound Explorer for KidsMove one clear slider to hear a close instrument or a roomy echo.Audio · GenerateInstrument Tone Balance Explorer for KidsUse WebAudioFont's real equalizer to make an instrument warmer or brighter.Audio · GenerateOverdrive Tone Explorer for KidsUse Tuna's real waveshaper to hear how a clean tone becomes rough and fuzzy.Audio · GeneratePing-Pong Echo Explorer for KidsSend real delay repeats from one side to the other and back again.Audio · GenerateSound Compressor Loudness Lab for KidsCompare light and strong compression while a clear sound pattern plays.Audio · GenerateSound Filter Sweep Lab for KidsMove a low-pass filter and hear a rich tone open from dark to bright.Audio · GenerateSound Wave Visualizer for KidsChange the pitch and see a sine, triangle, square, or sawtooth wave.Audio · GenerateString Length and Pitch Lab for KidsCompare six string lengths and hear how shortening raises pitch.Audio · GenerateTone Spectrogram Explorer for KidsPlay a generated tone sweep and watch its frequency band move upward.Audio · GenerateVoice Pitch Playground for KidsSlide from low to high pitch while the local demo keeps the same length.
Learning & Reference: Space & Astronomy
Learning & Reference: Space & Planets
Simulation · GenerateAlien Year Age CalculatorType your Earth age and count how many trips you would make around another star.Simulation · GenerateExoplanet Discovery Timeline for KidsTravel from a 1992 discovery to newer worlds found by watching stars and shadows.Simulation · GenerateExoplanet Distance Race for KidsRace two faraway worlds and see how many years even light would need to reach them.Simulation · GenerateExoplanet Explorer for KidsExplore 12 real faraway worlds and compare their stars, years, sizes, and distances.Simulation · GenerateExoplanet Size Comparer for KidsPut two exoplanets side by side and see how their sizes compare with Earth.Simulation · GenerateExoplanet Temperature Explorer for KidsCompare estimated temperatures on rocky worlds and giant planets far from Earth.Simulation · GenerateSpace Fact Flipbook for KidsExplore six clear pages about planets, the Moon, or stars.
Learning & Reference: Spelling Practice
Printable · GenerateHyperlegible Spelling Sheet MakerGive up to ten spelling words distinct shapes and wide writing lines.Printable · GenerateOpenDyslexic Spelling Sheet MakerMake a printable ten-word spelling page in OpenDyslexic with wide writing lines.Text · CheckSpelling Word Magic RevealerScramble one spelling word, say it aloud, then watch every correct letter return.
Learning & Reference: Sun Position
Coordinates · CalculateObserver Height Sunrise CalculatorCompare sea-level sunrise and sunset with an observer standing above the horizon.Coordinates · CalculateShadow Length CalculatorUse the sun angle and an object's height to estimate its level-ground shadow length.Coordinates · CalculateSolar Noon CalculatorFind local solar noon, the day's highest sun angle, and the darkest night point.Coordinates · CalculateSolar Panel Sun Angle HelperFind the panel tilt and compass direction that faces the sun at one exact time.