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620 apps

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Gentle, tap-and-play apps for our youngest (Pre-K & Kindergarten) — big buttons, audio-first, no reading required, and no way to get it “wrong.”

A happy toddler playing with big, bright building blocks on the floor while two round, cartoon-cute creatures cheer along.

Early-elementary apps (grades 1–3) — hands-on manipulatives with short, read-aloud questions. Big-kid feel, gently supported.

An early-elementary child building with colorful wooden cubes and counting tokens on a table, guided by a friendly cartoon helper character.

The tween core — full lessons, characters, and practice across every subject. Tap a subject to open it.

A focused tween working a puzzle with pencil and paper, paper fraction strips, a chess piece and a cipher dial, beside a friendly cast character.

The whole shelf: the Weather Room →

Numbers, fractions, geometry, and proof.

Math

NumberSense

About how much? Guess first.

Ages 8–13 · Gr 3–8 Level 1 ~20-min sittings

Guess first, then compute — a daily estimation workout that builds a real feel for numbers.

Play NumberSense →
Math

NumberVerse

Where does this number sit on the line?

Ages 9–10 · Gr 4–5 Level 1 ~20-min sittings

Build numbers from base-ten blocks, place and round on the number line, solve by jumping, subitize on a rekenrek, and practice place value, operations, factors, primes & integers across 12 kits.

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Math

MeasureQuest

Can you read a broken ruler?

Ages 8–11 · Gr 3–6 Level 3 ~20-min sittings

Read a ruler (even a broken one), balance a scale, convert units up and down the metric staircase, build shapes on a grid, graph your own data, and sharpen your estimates.

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Math

FractionForge

Which fraction is bigger?

Ages 9–11 · Gr 4–6 Level 1 ~20-min sittings

Build, place, and compare fractions with hands-on tools — bars, pies, and number lines.

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Card-game number sense & card math

CardForge

How many ways can these cards combine?

Ages 9–12 · Gr 4–7 Level 2 ~20-min sittings

Build runs and sets at the card table, predict how a card trick is forced, and practice 16 kits from the deck to combinatorics.

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Math / Financial Literacy

MintForge

How does interest grow your money?

Ages 9–13 · Gr 4–8 Level 3 ~20-min sittings

Make the money math click: work compound interest, markup, and loan payments in the Money-Math Lab, balance a 50/30/20 budget under surprise costs, and practice financial literacy across 16 kits.

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Math

TileTales

Do the open ends make five?

Ages 10–12 · Gr 5–7 Level 2 ~20-min sittings 👥 Together

Dominoes as number sense — read the pips at a glance, add the open ends to a multiple of five to score. Race a graded bot or a friend on this device to 61 over a few hands, or play a friend online one Block hand at a time.

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Data Science

DataForge

What story does this data tell?

Ages 9–12 · Gr 4–7 Level 3 ~20-min sittings

Build data pipelines, chart the story, and test hypotheses on small datasets you can tidy and chart — plus 16 kits.

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Mathematics · Estimation and the middle of a crowd

SwarmQuest

Can a whole room guess better than one?

Ages 10–13 · Gr 5–8 Level 3 ~20-min sittings 👥 Together

A whole-room estimation game on one screen. Everyone looks at a picture for a few seconds, then points to their guess on a number line while the host taps it in. Then the truth and the room's middle guess drop together, and you see how close the crowd got. One room score, no names, nothing typed. For middle-school clubs and classes.

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Math

FermiForge

Can you guess it within ten times?

Ages 9–13 · Gr 4–8 Level 3 ~20-min sittings

How many jelly beans fill that jar? How many breaths do you take in a day? You can guess almost anything — to within a power of ten — by breaking it into small pieces you CAN guess and multiplying. Meet Chunk, Bound, Round, Sanity and Unit, predict the order of magnitude, then watch your estimate land right next to the real answer. Real, tiny, deterministic maths — no calculator, no internet. Ages 9–14.

Play FermiForge →
Applied Math

TradeForge

How would the electrician work it out?

Ages 9–13 · Gr 4–8 Level 3 ~20-min sittings

A day on the job with twelve trades, for ages 9–14. The electrician sizing a circuit, the plumber’s slope, the baker’s ratio, the nurse’s dose — each worker is one piece of real math. You see a real job, GUESS the answer, then watch the worker compute it and explain. Applied arithmetic + a look at real careers. On-device, no accounts.

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Spatial Reasoning & 3-D Geometry

VoxelForge

Is that shape turned, or flipped?

Ages 9–13 · Gr 4–8 Level 3 ~20-min sittings

Turn 3-D shapes in your head and build them block by block — spot the true rotation (turned, not flipped) and stack a shape one flat layer at a time. A hands-on spatial-reasoning lab. Ages 9–14.

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Math

ChanceForge

What happens after a thousand flips?

Ages 10–12 · Gr 5–7 Level 2 ~20-min sittings

Run coin, dice, and law-of-large-numbers experiments, then practice probability & statistics across 16 kits.

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Mathematics · Inventing a measure of spread

InventForge

What makes a machine reliable?

Ages 11–13 · Gr 6–8 Level 3 ~20-min sittings

Which pitching machine is most reliable? Before any formula, invent your own measure of spread from parts, name it after yourself, and test it on new cases. Then meet the textbook's measure and see where the two disagree. Ages 9–14.

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Math

RatioRealm

Which mix is stronger?

Ages 11–12 · Gr 6–7 Level 2 ~20-min sittings

Scale ratios on a double number line, work recipe/map/blueprint scale problems, judge which mix is stronger, and practice ratio, rate, proportion & percent across 16 kits.

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Math

EquationQuest

What keeps both sides balanced?

Ages 11–13 · Gr 6–8 Level 3 ~20-min sittings

See algebra stay balanced — solve for x on a balance scale, combine like terms with algebra tiles, spot the slip in a worked solution, and practice early algebra across 16 kits.

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Math / Functions

FunctionForge

What rule is the machine using?

Ages 11–13 · Gr 6–8 Level 4 ~20-min sittings

Step into the function workshop: feed numbers into a machine, watch what comes out, and crack the hidden rule. Build y = mx + b on a coordinate grid to match a target line, read slope and intercept off a graph, and try the vertical line test — then practice functions, tables, expressions, and pre-algebra across 16 kits. On-device; works with the sound off.

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Math

CalendarForge

Why does the holiday move each year?

Ages 10–13 · Gr 5–8 Level 3 ~20-min sittings

Why does Tết move? Why does Ramadan slide earlier every year? Because the sun and the moon keep two clocks that don’t divide evenly — and you can do the arithmetic. Predict how far a solar, a lunar and a lunisolar calendar drift against the seasons, see the arithmetic, then drift any calendar across the centuries in the Calendar lab. Real, tiny, deterministic maths — no internet. Ages 9–14.

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Math

SpokeForge

How many turns from one push?

Ages 10–13 · Gr 5–8 Level 3 ~20-min sittings

How does a bicycle turn one push of your legs into a wheel spinning four times over? Gears. The front teeth divided by the rear teeth is the gear ratio — how many wheel turns you get per pedal — and it sets everything: how hard the pedals are, how far one push carries you, how fast you go. Predict the ratio, then build your own gear in the workshop. Real, tiny, deterministic maths — no internet. Ages 9–14.

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Math

GeometryForge

What do the angles add up to?

Ages 11–13 · Gr 6–8 Level 3 ~20-min sittings

Make angles with a live protractor, build polygons and reason about their angle sums, slide/flip/turn shapes on a grid, find lines of symmetry, and stretch a geoboard to an exact area — plus 17 kits of geometry.

Play GeometryForge →
Mathematics

BridgeForge

Where does this math show up in life?

Ages 10–12 · Gr 5–7 Level 3 ~20-min sittings

Build bridges between math and everything else. Match a math idea — ratio, symmetry, rate, probability — to the real-world moment in art, music, science, sport or code that actually uses it. Plus cross-curricular Concepts checks. Ages 9–14.

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Math

MathCircle

What is your plan before you solve?

Ages 11–13 · Gr 6–8 Level 5 ~20-min sittings

Solve 60 math-circle competition problems the way mathematicians do — Understand, Plan, Execute, Look Back — with hints that only unlock after you put your own thinking into words. Plus a strategy trainer: which first move cracks the problem?

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Math · Ratio & Percent (through your own sports times)

SplitForge

How much faster were you than last time?

Ages 10–13 · Gr 5–8 Level 3 ~20-min sittings

Enter your OWN swim/run/bike times and learn the middle-school ratio & percent core through them — pace as a unit rate, percent improvement, negative vs positive splits, yards↔metres, and qualifying cuts as inequalities. Five little coaches, each one math move. On-device, no names, no upload, no AI.

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Math

ProofQuest

Is this always true, or just sometimes?

Ages 12–13 · Gr 7–8 Level 4 ~20-min sittings

Build mathematical proofs step by step, hunt counterexamples, and practice logical reasoning across 16 kits.

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Math · Ratios, rates and unit rates on factory belts

ConveyorForge

How many machines keep up with the ore?

Ages 10–13 · Gr 5–8 Level 3 ~20-min sittings

A factory you can watch. Set the machines, run the belts, find where the line is waiting — then fill the order. Threefer turns 3 ore into 2 plates every 4 seconds: how many machines keep up? Too few and the belt backs up; too many and one sits idle. Ages 9–14.

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Math

MasteryForge

Ready for the next problem at your edge?

Ages 12–13 · Gr 7–8 Level 5 ~20-min sittings

Adaptive math practice that picks your next problem at the edge of what you know — extend, consolidate, or stretch — across fractions, geometry, functions, and more.

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Math / History of Mathematics

MathLore

How did this mathematician figure it out?

Ages 10–13 · Gr 5–8 Level 3 ~20-min sittings

Travel the history of mathematics — from tally marks on the Ishango bone to Ramanujan’s infinite series. Visit five eras, solve the mathematicians’ own problems, order the great discoveries, and practice math history across 16 kits.

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Math

FlickForge

Where will the struck disc stop?

Ages 9–13 · Gr 4–8 Level 3 ~20-min sittings

The physics of the flick, for ages 9–14: predict where a struck disc will come to rest — after it banks off a rail (angle in = angle out), slows to a stop (friction), or passes its momentum to another disc (the carrom strike). You call the landing band, then the deterministic sim reveals the path so you can reconcile. Plus a free table to experiment on. On-device; nothing leaves your device.

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Mathematics · Pop-up engineering: the parallelogram rule

PopForge

Will this pop-up fold flat?

Ages 9–13 · Gr 4–8 Level 3 ~20-min sittings

Pop-up engineering. Pick a card, or set the distances and panel lengths yourself, and guess: will it fold flat, poke out of the closed card, or not fold properly? Then open and close it in 3-D and see the rule in numbers: a pop-up works when it's a parallelogram. Print the template, cut, fold and glue.

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Math

CreaseForge

Where does the fold send this point?

Ages 10–13 · Gr 5–8 Level 4 ~20-min sittings

Every time you fold a piece of paper, you are doing geometry: the crease is a mirror, and whatever was on one side lands as its reflection on the other. Fold across a line and a dot mirrors straight over it; fold one edge onto another and you bisect the angle exactly — no protractor. Predict where a fold lands, then mirror a point yourself in the lab. Real, tiny, deterministic maths — no internet. Ages 9–14.

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Math

MosaicForge

Where will this tile score the most?

Ages 9–13 · Gr 4–8 Level 3 ~20-min sittings

Tile-laying strategy for ages 9–14: place coloured tiles on a grid to score — a big same-colour CLUSTER, or a MOSAIC bonus for a tile that borders three different colours. Predict the best placement, then the engine reveals every cell’s score so you can reconcile. Plus a free board to build on. On-device; nothing leaves your device.

Play MosaicForge →
Mathematics · geometry: reflections, symmetry lines and the fold-and-cut theorem

OneCutQuest

Can one cut make this whole shape?

Ages 9–13 · Gr 4–8 Level 4 ~20-min sittings

Houdini put it in his book of paper tricks: fold a sheet, snip once, open — a perfect star. Fold the paper so every edge of a shape lands on one line, make your one cut, and see what falls out. Then do it with real scissors.

Play OneCutQuest →
Mathematics · Fractions and equations: find the line that does not follow

SlateForge

Which line of Scrawl’s working doesn’t follow?

Ages 9–13 · Gr 4–8 Level 3 ~20-min sittings

Scrawl, a young crow, works fraction sums and equations in fast slanted ink, and one line always goes wrong: added the bottoms, forgot to flip, moved a number without changing its sign. Find the line, pick the fix, and tell Scrawl the rule. Then work your own: the margin only says "follows" or "doesn't follow yet". No answers given, nothing leaves your device.

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Math

SextantForge

Where are we, by the stars?

Ages 10–13 · Gr 5–8 Level 4 ~20-min sittings

How did sailors find their way with no GPS? They read the sky. The North Star’s height above the horizon IS your latitude; a clock set to home turns your local noon into your longitude at 15° an hour. Measure Polaris, predict your position, then check it in the Navigator’s lab. Real, tiny, deterministic maths — angles and time — no internet. Ages 9–14.

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Math

IdentityForge

Why does (a+b)² equal that?

Ages 11–13 · Gr 6–8 Level 5 ~20-min sittings

See why (a+b)² = a²+2ab+b² — build the box, watch the two twins, and snip-test an identity.

Play IdentityForge →
Math

MentalForge

Can you work it out in your head?

Ages 9–17 · Gr 4–12 Level 3 ~20-min sittings

Get quick at mental maths — sprints you work out in your head, plus a lab of mental-maths shortcuts shown step by step. An abacus pictures every number. No clock, no pressure, nothing leaves your device.

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Math

ShowMath

Can you perform this math trick?

Ages 9–17 · Gr 4–12 Level 4 ~20-min sittings

Learn mental-math tricks worth showing off — then actually perform them. Name the weekday of any birthday, reveal a hidden digit, and take a bow. A fresh calendar puzzle every day. On-device, nothing leaves your phone.

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Math

CrowdForge

Which lever makes the park fairer?

Ages 8–11 · Gr 3–6 Level 3 ~20-min sittings

Run the Commons — a park where 180 little people arrive, queue, and decide. Pull a lever (price · staff · ride speed · game odds · gate fee), predict what happens, then watch. Two meters always watch back: Profit and Fairness. The maths IS the game.

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Math · Statistics, Sampling & Fair Tests

Solitaire Lab

Does this rule make solitaire better?

Ages 11–13 · Gr 6–8 Level 3 ~20-min sittings

Is a rule change good for solitaire? Predict first, then test it on dozens of real deals: the lab plays every deal both ways with a solver that never lies — won, lost, or “not sure yet.” See how sure you can be (with a 95% interval), which deals the rules disagreed on, and why a bigger search finds more wins of the very same deals. Download your table for a science-fair chart. Ages 9–14.

Play Solitaire Lab →

Reading, writing, grammar, and wordplay.

Life, earth, space, and how things work.

Coding, robotics, AI, and computational thinking.

Ciphers, strategy, deduction, and brain-benders.

This season: how a vote is counted, with practice ballots first. No real candidate, party or measure anywhere.

Feelings, coping skills, and getting along.

Drawing, illustration, film, design, and making.

Today's painting: Katsushika Hokusai Under the Wave off Kanagawa (The Great Wave). Look at it in SpectrumCanvas

Paintings: The Metropolitan Museum of Art, Open Access (CC0 public domain).

Music, songwriting, dance, and theatre.

Real-stakes apps for high-schoolers — personal finance, decision-making, and planning for the road ahead. Written to trust the reader.

A teenager thinking through a real-world budget with an open notebook, coins, a savings jar and a hand-drawn decision chart.

How it works

Each browser app mirrors its iOS app — the same practice, hints, and characters. Your progress is saved only on this device (no accounts, nothing sent anywhere). More apps are on the way.

Loved by learners

Play FractionForge Play GrammarForge Play GambitTales Play CipherForge Play ProofQuest Play ChanceForge Play GeometryForge Play FunctionForge