DLD: Logic Design & Circuits
Gates, flip-flops, truth table
Free · Designed for iPad. Not verified for macOS.
Wire a circuit and watch the current move through it. Gates up to 8 inputs, flip-flops, MUX, 7-segment displays, live truth tables and Boolean equations — all offline.
DLD is a digital logic design and circuits workbench for your phone. Drop gates onto the
bench, wire them together, flip a switch, and watch the signal travel through
the circuit in real time.
Built for students working through a digital logic design course — and for
anyone who wants to see Boolean algebra actually do something.
BUILD ANYTHING
• 28 components: switches, clocks, Vcc and ground, every standard gate,
tri-state buffers, multiplexers, flip-flops, displays and probes
• Gates take 2 to 8 inputs — one wide NAND instead of three cascaded ones
• Tap a component to reach its settings: input count, clock speed, colour
• A work bench far bigger than the screen, with pan, zoom and fit-to-circuit
SEE IT WORKING
• Current animates along every live wire, so you can follow a signal
• LEDs, LED bars, 7-segment and hex displays light up as the circuit runs
• A school bell that rings for as long as it has current
• Logic probes read out 1 or 0 anywhere you wire one
UNDERSTAND IT
• Boolean equations written out from whatever you have drawn
• A full truth table generated from your circuit, ready to copy out
• Conflicting drivers on a net are flagged rather than quietly wrong
• A tutorial section covering every gate symbol and its truth table
KEEP YOUR WORK
• Save and reopen as many circuits as you like
• Undo and redo everything
• Recolour wires, lamps and blocks however you want to read them
COMPONENTS
Switch · Clock · Vcc · GND · AND · OR · NOT · NAND · NOR · XOR · XNOR ·
Buffer · Tri-state buffer · Tri-state NOT · MUX · DEMUX · D flip-flop ·
T flip-flop · JK flip-flop · Virtual links · LED · LED bar · 7-segment ·
Hex display · Bell · Probe · Label
PRIVATE BY DEFAULT
No account. No sign-in. No analytics. No ads. Nothing leaves your device —
your circuits are saved on the phone and nowhere else. The app works with no
network connection at all.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Muhammad Rafhan, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Muhammad Rafhan
- Size
- 18.3 MB
- Category
- Education
- Compatibility
Requires iOS 13.0 or later.
- iPhone
Requires iOS 13.0 or later. - iPad
Requires iPadOS 13.0 or later. - iPod touch
Requires iOS 13.0 or later. - Mac
Requires macOS 11.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Skyloop Apps