# OBE Engineering System vs Logic Circuits Simulator

The clearest difference is price: OBE Engineering System at Free against Logic Circuits Simulator's $0.99. OBE Engineering System also leads on iOS requirement (12.0 vs 15.0). Logic Circuits Simulator's advantage is update cadence (every 3 weeks vs every 9 months). On ads, in-app purchases and device support there is nothing between them.

OBE Engineering System is free to download; Logic Circuits Simulator costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

OBE Engineering System ships an update every 9 months, Logic Circuits Simulator every 3 weeks. The most recent releases landed on September 21, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | OBE Engineering System | Logic Circuits Simulator |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 3 weeks** |
| Monetization | — | Paid |
| Size | 37 MB | 3 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Softzone](https://appshunter.io/developer/1576527087) | [Abdulhakim Aloraini](https://appshunter.io/developer/1825542423) |

## What reviewers say

### OBE Engineering System

[App page](https://appshunter.io/ios/app/obe-engineering-system/id1668638241)

**Features:** macOS Compatibility

**In-app purchases:** none


### Logic Circuits Simulator

[App page](https://appshunter.io/ios/app/logic-circuits-simulator/id6748374538)

Design and simulate digital logic circuits with standard gates, sequential logic, and Karnaugh maps. Features schematic-quality wire routing and reusable custom chips. Export truth tables and circuit designs for reports and sharing.

**Highlights:** IEEE-standard logic gates, Sequential logic simulation, Karnaugh map minimization, Schematic-quality wire routing, Reusable custom chips, Truth table generation, iCloud sync across devices

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

**In-app purchases:** none


## Frequently asked questions

### Is OBE Engineering System free?

OBE Engineering System is free to download, with no in-app purchases.

### Is Logic Circuits Simulator free?

Logic Circuits Simulator costs $0.99, with no in-app purchases.

### Do OBE Engineering System or Logic Circuits Simulator have ads?

Neither OBE Engineering System nor Logic Circuits Simulator shows ads.

### Which is updated more often, OBE Engineering System or Logic Circuits Simulator?

OBE Engineering System ships an update every 9 months, and Logic Circuits Simulator every 3 weeks. Most recently, OBE Engineering System was updated on September 21, 2026 and Logic Circuits Simulator on September 29, 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.*