# DLD vs HDLSim

The clearest difference is in-app purchases: DLD at none against HDLSim's 2. HDLSim's advantage is update cadence (every 4 days vs every 5 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. HDLSim sells 2 in-app purchases, starting at $2.00 per month. DLD asks for nothing beyond the download.

DLD ships an update every 5 weeks, HDLSim every 4 days. Both last shipped on November 13, 2026.

## The numbers

| Metric | DLD | HDLSim |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (2 ratings)](https://appshunter.io/ios/app/dld-logic-design-and-circuits/id6814475914/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 4 days** |
| Monetization | Free | — |
| Size | 19 MB | 15 MB |
| Requires iOS | **14.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Muhammad Rafhan](https://appshunter.io/developer/1862281894) | [Julio Francisco Reyes Gonzalez](https://appshunter.io/developer/6824013496) |

## What reviewers say

### DLD

[App page](https://appshunter.io/ios/app/dld-logic-design-and-circuits/id6814475914)

Design and simulate digital logic circuits in real-time. Build complex systems with a variety of components, visualize signal flow, and generate truth tables and Boolean equations. Ideal for students and enthusiasts learning digital logic.

**Highlights:** 28 digital logic components, Real-time signal animation, Automatic truth table generation, Boolean equation output, Offline circuit saving, Interactive tutorial section

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### HDLSim

[App page](https://appshunter.io/ios/app/hdlsim/id6824013494)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| HDLSim Pro Monthly | $2.00 | per month |
| HDLSim Pro Annual | $20.00 | per year |


## Frequently asked questions

### Is DLD free?

DLD is free to download, with no in-app purchases.

### Is HDLSim free?

HDLSim is free to download, with in-app purchases available.

### Do DLD or HDLSim have ads?

Neither DLD nor HDLSim shows ads.

### Which is updated more often, DLD or HDLSim?

DLD ships an update every 5 weeks, and HDLSim every 4 days. Most recently, DLD was updated on November 13, 2026 and HDLSim on November 13, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*