# HDLSim — Verilog, CPLD & 3D breadboard

> Verilog, CPLD & 3D breadboard (iPhone/iPad app by Julio Francisco Reyes Gonzalez.)

- Source: https://appshunter.io/ios/app/hdlsim/id6824013494 (this page in markdown: same URL + `.md`)
- Developer: [Julio Francisco Reyes Gonzalez](https://appshunter.io/developer/6824013496)
- Category: Education, Developer Tools
- Price: Free with in-app purchases
- Age rating: 12+
- Requires: iOS 15.0 · 6 MB
- Languages: American English
- Released: 2026-10-31
- Data updated: 2026-11-06

## What is HDLSim?

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).
• Pro: everything in Free, 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

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| HDLSim Pro Monthly | $2.00 | per month |
| HDLSim Pro Annual | $20.00 | per year |


## Is HDLSim safe?

Not enough ratings yet to assess HDLSim.

## Is HDLSim legit?

HDLSim has limited verification signals. The AppsHunter Legitimacy Score for HDLSim is 58 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 2 releases)

### 2.0.0 — 2026-11-04

• Boolean equation compiler: type an equation and get its truth table, Karnaugh map, minimum form and gate circuit, ready to build on the breadboard with 74HC, 74HCT or 74LS chips.
• Loose logic gates on the 2D schematic, with the chip that builds them.
• Guided lessons to get started: your first circuit, your first Verilog gate, digital logic, and De Morgan with Karnaugh maps.
• 29 guided labs and new components, such as the PC817 optocoupler and a DC motor.
• The Free plan now limits components instead of labs or breadboards: designs with up to 7 components on the board the circuit needs.
• Save when you want, with a warning for unsaved changes, and each account has its own project library.

### 1.0.0 — 2026-10-31

No release notes.

## Related topics

[digital simulator bitgatelab](https://appshunter.io/ios/topics/digital-simulator-bitgatelab)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-11-06.*