HDLSim vs MathBench

HDLSim is a digital electronics lab on your iPhone. Write Verilog, compile it for the EPM240 CPLD and watch it run on a virtual development board, with a 2D schematic and a 3D breadboard. WHAT YOU CAN DO • Verilog editor with compilation and error messages. • EPM240 CPLD simulator: load your design and test its inputs and outputs on the board. • 2D schematic: place components, wire them and simulate the circuit. • Boolean equation compiler: truth table, Karnaugh map, minimum form and a gate circuit built with chips. • Step-by-step guided lessons. • 3D bench and breadboard: the same circuit built in 3D, with wires, resistors, LEDs and more. • Guided labs: Ohm's law, dividers, diodes and rectifiers, transistors, op-amps, logic gates, adder, latch, 555 timer and 7-segment display. • Your projects are stored on your iPhone. PLANS • Free: Verilog editor, CPLD simulator, 2D schematic and 3D bench, designs and labs with up to 7 breadboard components on the 170, 400 or 830-point board the circuit needs, and boolean equations of up to 4 inputs and 1 output (the circuit it builds does not count toward the 7-component limit while unedited). Includes ads. • Pro: everything in Free with no ads, designs with more than 7 components, every lab in the catalog and equations of up to 6 inputs and 6 outputs. Pro is an auto-renewing subscription, monthly or yearly, at the price shown in the app. Payment is charged to your Apple ID when you confirm the purchase. The subscription renews automatically unless you cancel it at least 24 hours before the end of the current period. Manage or cancel it in Settings > your name > Subscriptions. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy: https://hdlsim.web.app/privacy.html

MathBench turns math into hands-on reasoning. Do the same thing to both sides of a balance until only x remains. Drag parameters until a parabola passes through the target. Bisect an angle with only a compass and straightedge. Every move is checked for equivalence in real time. FOUR SUBJECTS, 95 LEVELS Algebra Balance: linear equations, systems, quadratics and inequalities. Multiply by a negative and the sign must flip; divide by an expression in x and you may lose a root. Brainer levels are built around these traps. Graphs: linear, quadratic, inverse and absolute-value functions, shifts and stretches, and solving equations and inequalities by graph. Constructions: perpendicular bisectors, angle bisectors, perpendiculars, parallels, regular hexagons, circumcenter and incenter, tangents to a circle. Probability: toss coins, roll dice, draw balls, and explore geometric probability. Compare exact probabilities with sample frequencies. 40 levels are playable right away. The other 55 unlock with Pro. A daily challenge and a review list bring back levels you solved with help. PRINCIPLE CARDS After each solve, a Principle Card explains why it works using the numbers from your own solve, such as x = (3 ± √17)/4 or 3² + 4² = 25. SIX TOOLS • Exact fractions: simplify, common denominators, mixed numbers, repeating decimals, prime factorization • Equations: linear and quadratic with exact radicals, inequality intervals, 2×2 and 3×3 linear systems • Graphing: up to three curves with zeros, intersections and vertices • Triangle solver: find the remaining sides, angles and area, including the two-solution case • Statistics: mean, median, variance and more, with a frequency histogram and box plot • Combinatorics: permutations, combinations, factorials and binomial coefficients Tool results are unlimited; hints are never consumed and undo is unlimited. PRO — ONE-TIME PURCHASE All 95 levels, full Principle Card derivations, step-by-step tool working, and a Free Bench you can edit and save (balance, graph, construction and probability benches). Pro includes every worked answer and all Pro features. The first three fixed sample answers in each subject are free to view; all remaining answers unlock with Pro. One-time purchase. No subscription. PRIVACY All calculations run on your device and work offline. No account and no analytics SDK. Progress syncs through your own private iCloud. NOTE: MathBench is for understanding principles and practicing reasoning. Problems are original, not tied to any textbook, and no exam-score gains are promised. Support, Privacy Policy and Terms of Use are in Settings.