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Subset Generator
One set per line - list every subset (the power set) with an iterative bit-mask loop, filter or group by subset size, and get the exact subset total
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Regex Tester
Test a regex against sample text with g, gi, gm, gim, gs or gims flags and find, replace or split modes, listing every match with content, position, length, capture groups and line number, clear syntax-error messages and safe zero-width handling
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Math Worksheet Generator
Generate primary-school arithmetic drills from a few parameters - operation, question count and value limit - with a result table and a printable worksheet, answers shown or hidden, and a seed that reproduces the same set
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Nash Equilibrium Calculator
Analyze bimatrix and zero-sum games: strict/weak dominated strategy elimination, pure and 2x2 mixed Nash equilibria, zero-sum saddle points, maximin security strategies and game value
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Advanced Stats Calculator
Get IQR, skewness, kurtosis, mode, coefficient of variation, Shannon entropy, T statistic and per-point Z scores in one run - Excel-compatible definitions (QUARTILE.INC / SKEW / KURT), with a dash instead of NaN when a metric is undefined
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GCD and LCM Calculator
Find the GCD and LCM of each line of integers in batch, with the Euclidean algorithm steps and support for very long numbers
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Truth Table Generator
Enter a Boolean expression and get the full truth table plus the minterm form (sum of products) and maxterm form (product of sums) - NOT/AND/OR/XOR/implication/equivalence, up to 8 variables
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Integer Partition Generator
List every addition combination that sums to a number (integer partitions, order ignored), group them by addend count, or count them - with batch input and exact BigInt counting
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Boolean Expression Converter
Convert between SOP and POS forms, swap minterms and maxterms, and translate truth-table row numbers - a hand-written parser enumerates the truth table and returns canonical SOP/POS with Sigma-m / Pi-M indexes
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CRC Calculator
Batch-compute eight standard CRCs (CRC-8, CRC-8/MAXIM, CRC-16/ARC, CRC-16/CCITT-FALSE, CRC-16/XMODEM, CRC-16/MODBUS, CRC-32, CRC-32C) - one record per line, UTF-8 text / hex / decimal byte input, per-row verification and byte-by-byte steps
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Statistics Calculator
Batch statistics per line: mean, median, mode, harmonic and geometric mean, min/max, range, variance, standard deviation, sum of squares, sum and count - with population or sample variance
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Knapsack Solver
Solve the 0/1 knapsack and unbounded knapsack online - enter items as "weight,value", set the capacity, and get the optimal combination with its best total value, total weight and remaining capacity
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Combinatorial Design Generator
Generate Latin squares, Steiner triple systems STS(v), balanced incomplete block designs BIBD(v, k, lambda) and pairwise covering arrays, with Bose construction, greedy plus backtracking and clear reasons for infeasible parameters
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Prime Factorization Calculator
Factor numbers into primes in batch - product and exponent form plus the divisor count and divisor sum, for integers up to 18 digits
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Prime Number Checker
Check whether numbers are prime, list primes in a range, or find the Nth prime - Miller-Rabin for large numbers and the smallest factor for composites
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Finite Difference Calculator
Compute every order of differences for each series and print a staircase difference table - a constant row reveals the polynomial degree and the leading difference, and up to degree 3 the Newton forward formula is recovered
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Fibonacci Calculator
Compute the Nth Fibonacci or Lucas number, the first N terms, or any index range - fast doubling handles the 10000th term in milliseconds
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Pi Nth Digit Lookup
Look up which digit stands at decimal position 1 to 1,000,000 of pi, with five digits of context on each side; the first million decimals are preloaded on the server, and several positions can be queried at once
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Percentage Calculator
Batch percentage math from two numbers per line - what percent, percent of a value, change rate, increase or decrease, with the formula shown
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3D Function Plotter
Enter one function z=f(x,y) per line and get a colour-shaded 3D surface drawn with isometric projection, painter-algorithm occlusion and adjustable azimuth/elevation, plus sampling statistics and sample point tables
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Set Calculator
One set per line - get the union, intersection, difference, symmetric difference and complement at once, plus a Venn diagram count summary, with exact handling of very long integers
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Next Number in Sequence
Infer the next term of a sequence from its first few terms: arithmetic, geometric, finite differences, second-order linear recurrence and well-known sequences such as Fibonacci, primes, squares, factorials and Catalan numbers - every model is verified against the known terms
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Truth Table to Boolean Expression
Turn a truth table (its output column or the list of rows that output 1) into a minimized Boolean expression with Quine-McCluskey, giving minimal SOP and POS plus the canonical sum and a row-by-row verification
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Elliptic Curve Calculator
Compute point addition, doubling, scalar multiplication, negation and curve order on y²=x³+ax+b (mod p) over a finite field - modular inverse via extended Euclid, scalar multiplication via double-and-add with step output, secp256k1 presets, all exact with BigInt
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Karnaugh Map Solver
Enter minterms and don't cares to get the minimal SOP and POS via Quine-McCluskey, a Gray-code Karnaugh map grid with every group marked, plus the prime implicant count and an AND/OR/NOT gate estimate
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Finite State Machine Simulator
Online finite state machine simulator: paste a transition table (comma or arrow notation) to run DFA and NFA machines with epsilon transitions, plus determinism checks, reachable and unreachable states, and a step-by-step trace for each test string
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Discrete Log Solver
Solve g^x ≡ h (mod p) for x with Baby-step Giant-step, brute force and Pohlig-Hellman side by side; one g,h,p per line, automatic order detection, no-solution detection and g^x mod p = h verification
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LLL Lattice Reduction Tool
A teaching demo of LLL lattice basis reduction and the low-density subset-sum (knapsack) attack: feed a lattice basis or a knapsack instance and get the reduced basis, norms and a verified 0/1 solution vector, with an honest failure notice when reduction cannot recover it
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Fractal Tree Generator
Draw a recursive fractal tree on canvas and label every node with a number - binary, ternary, Pythagoras and Sierpinski shapes with sequential, binary-path, Fibonacci or seeded random numbering
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Cartesian Product Calculator
One set per line - list every combination of the Cartesian product A x B x C, with a custom joiner, optional grouping and the exact product size
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Matrix Calculator
Compute matrix multiplication, addition, transpose, determinant, inverse, rank and trace at once - separate two matrices with a blank line, LU with partial pivoting for the determinant and Gauss-Jordan for the inverse
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Sequence Pattern Detector
Detect the pattern of each number sequence line by line: constant, arithmetic, geometric, finite differences, second-order linear recurrence, periodic, plus common sequences such as primes, squares, cubes, triangular numbers, factorials and powers of two - with the reasoning, general term and next-term prediction
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Recursion Visualizer
Step through 8 classic recursive algorithms (factorial, fibonacci, hanoi, binary search, permutations, subsets, recursive GCD, merge sort) call by call, with an indented call tree, total calls, max depth and duplicate-subproblem statistics, plus a node cap for trimming
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Compression Simulator
Data compression simulator: enter one or more texts, simulate lossless Huffman coding and LZ77, and compare original vs compressed bit counts, compression ratio and Shannon entropy, with a full Huffman code table and LZ77 triple breakdown
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Geometry Calculator
Enter point coordinates to auto-detect the figure, compute sides, angles, area and perimeter, decide properties such as equilateral, isosceles, right, parallelogram or square numerically, and verify claims like AB = CD, AB // CD or AB ⊥ CD
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Probability Distribution Calculator
Pick one of seven distributions (normal, binomial, Poisson, uniform, exponential, geometric, hypergeometric) and get a PMF/PDF and CDF table, a text bar chart and a summary of mean/variance/SD/mode; combinatorics run in log space, so binomial n=200 never overflows
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Graph Algorithm Solver
Compute adjacency list, BFS/DFS traversal, shortest path (Dijkstra for weighted graphs), connected and strongly connected components, topological sort, minimum spanning tree and adjacency matrix from an edge list, with clear notices for cycles, self loops, duplicate edges and negative weights
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Polynomial Root Finder
Solve polynomial equations online: Durand-Kerner returns all roots including complex ones, plus Newton and bisection methods with step-by-step iterations
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