DCircuit Lab vs Check It Again

DCircuit Lab is a tool to simulate combinatorial and sequential digital circuits. Circuits can be simulated in two ways: 1) one single step: all the outputs values are evaluated at the same time 2) step by step: outputs and gates are evaluated one step a time If circuit contains clock inputs, its simulation is dynamic. This means that outputs change accordingly to the clocks. During this dynamic simulation, user can change inputs values to study the circuit behavior which is also provided via a timing chart. Circuits are built using basic components, gates and flip-flops: * inputs (three state: 1, 0, X - undefined) * outputs * wires * NOT, AND, NAND, OR, NOR, XOR gates with any number of inputs * Flip-flop RS, JK, T, D (Positive or Negative Edge Triggered and with Set and Reset Inputs) * Multiplexers with any number of inputs * Demultiplexers with any number of outputs * Fully configurable Clocks * Custom Components defined by their truth table * BCD to 7 Segments Display Decoder * 7 Segments Display Some video tutorials are available directly from the application to learn how to use it.

Check It Again is a dead simple checklist app for the things you do over and over. Pack your bag. Prep for a meeting. Run your weekly review. Check everything off. Do it all again next time. That's it. That's the app. No AI. No subscription. No "premium features." No tracking what you check off or selling that data to anyone. No account to create. No onboarding flow. No push notifications asking you to "stay on track." No gamification. No streaks. No badges. No syncing your grocery list to a server farm in another country so an algorithm can learn your shopping habits. Just a list. With checkboxes. That you can use again. Check Again syncs privately across all your Apple devices via iCloud — your data stays yours, on your devices, period. If you've ever downloaded a checklist app and thought "why is this so complicated?" — this one's for you. Made with love in Westfield, Massachusetts (by just one guy).