LoCAD10.0 - App Store

LoCAD is a software for designing and simulating digital circuits.
Special emphasis is given to simple creation and graphical visualization of a circuit's functioning.

The inputs and outputs of the elements can be wired quite simply.
Usually, two touches are sufficient. The system searches a convenient way by itself.

In the simulation, you can watch the current flow and thus follow the cycle of state changes.
This way, your understanding of a circuit's functioning is enhanced, and your perception of circuit faults is improved.

It is possible to produce your own elements (ICs) with discretionary levels of nesting.
Like this, you can build big and complex circuits in a clearly arranged way. During the simulation, you can watch the state changes in all ICs.

A detailed introduction facilitates your familiarisation with the software.

Version History This update includes adjustments to accommodate the new operating systems and stability improvements. 10.0 6d ago This update fixes
• the bug that prevents input and decision windows from being displayed in iOS 26
• the problem with loading and saving circuits caused by a change in iOS 26 9.3 Feb 21 This update fixes the bug that previously purchased full versions are not recorded correctly. 9.2 Feb 17 This update contains stability improvements.
Furthermore, the app can be tested for 7 days without any restrictions. After the trial period has expired, the app has the following restriction:
• Operation cannot be activated

In-app purchases that have already been made can of course be restored. 9.1 Feb 11 Due to a programming error in version 8.2.2, a continuous cycle on the iPad cannot be canceled with the on/off switch. 8.2.3 07/07/2025 This update fixes minor bugs and improves performance thanks to your feedback. 8.2.2 07/02/2025 This update
• prevents the incorrect error message “A problematic connecting line was found” that may occur in edit mode
• fixes an error caused by the adaptation to iPadOS 17.6.x when
> selecting lines in edit mode
> creating ICs
> stopping the clock generator via the stop input 8.2.1 10/03/2024 This update fixes the problem
• that in operating mode, the crosshairs only appear in the magnifying glass when it is moved slightly.
• that the new setting options (see version 8.0) can lead to irritating signal sequences when using a clock generator due to unfavorable overlapping. 8.2 10/01/2024 This update fixes the error
• that occurs in continuous clock mode for clock pulses with a phase setting of 1:12.
• that the buttons for cycles and frequency are not activated at the end of a cycle sequence. 8.1 09/26/2024 This update adds the following to the operating mode
• an option to specify a number of cycles that are executed as a cycle sequence using the continuous pulse button. If the number 0 is entered, normal continuous pulse mode is activated. 

• an option to adjust the clock frequency. 8.0 09/13/2024 In this version
• fixes the delayed signal run error that occurs as of iPadOS 17.6.x
• the display in the large 7-segment display with decoder is adapted to hexadecimal coding (0000 → 0, 1001 → 9, 1010 → A, 1111 → F). 
So that leading zeros can be hidden, the display is provided with an activation input A (top right). 
When loading a circuit with the previous version, the activation input is automatically added. 7.7 09/07/2024 This update fixes a display error in the IC interior view.
Due to a programming error when hiding dummy leads (see version 7.0), some short leads that lead to component connections are not displayed in the internal view of ICs.
As this is only a display problem, it has no effect on the function of the ICs. 7.6 02/09/2024 This update fixes a display error in the LED matrix and contains further stability improvements. 7.5 02/02/2024 This update
• contains stability improvement
• adds a diode to the basic elements and an LED matrix and an enlarged seven-segment display with integrated decoder to the block elements.
This ensures the exchange of circuits between the macOS and iOS versions. 7.4 11/06/2023 This update contains some improvements for editing cutouts. 7.2 09/13/2023 This update
• improves the algorithm for automatic dragging of lines in connection with the basic element location options added in version 7.0.
• eliminates the short line pieces for creating gaps (see version 7.0) from the IC internal circuit 7.1 08/30/2023 This update contains the following changes:
• By popular request, the position options of the basic elements have been added, so that the outputs can now also be directed to the left and upwards. The desired position can be selected via the arrows in the second row.
• When creating ICs, input lines without a connection to a component that are a maximum of 3 grid units long are not drawn as a connection at the IC edge but are entered as a gap in the row of connections. 7.0 08/14/2023 This update
• fixes a problem that occurs when deleting nested ICs
• now also considers the possibly existing negation points at IC inputs when
 initializing a circuit
• shows the exact delay value in the signal delay window. 6.4 07/29/2023 This update
• prevents the possible wrong positioning of ICs with a very short click on the touchpad
• fixes a bug when using negation points at IC outputs. 6.3 07/22/2023 This update removes a minor ambiguity regarding connection designations when creating ICs. 6.2 07/09/2023 This update fixes a bug regarding the language setting. 6.1 02/07/2023 Due to the problem with the text display when rotating in portrait orientation, which occurred in some cases, the rotate function is omitted from this version and the Book button is inserted instead.
This can be used to display the text selected under ‚Settings‘.
By using Mac Catalyst, this iPad app can now also be run on a Mac. However, this reduces the signal speed. 6.0 01/30/2023 This update speeds up the loading of complex circuits. 5.3 01/09/2022 • This update fixes a switching problem at AND and OR gates that can occur in special individual cases when two similar signals arrive at two inputs almost simultaneously.

• In this version, the switching behavior of the tri-state gates has been made more realistic and a matching short-circuit detection has been integrated.
If two connected tri-state outputs are activated, where one output is on H and the other on L, a short circuit exists.
To avoid unclear line conditions, care should be taken with the improved tri-state gates to ensure that an active gate is first deactivated before a gate connected to the same line is activated.
A circuit containing previous tri-state gates will still work.

• A detection of problematic connections (interconnection of outputs of two gates) has also been integrated, which is activated in the operation mode. 5.2 12/01/2021 This update prevents the program crash that could previously occur under special circumstances when the app was moved to the background after using the magnifying glass with the home button and later reactivated. 5.1.1 06/08/2021