# Logic Op vs NRRS

The clearest difference is price: NRRS at Free against Logic Op's $2.99. NRRS also leads on update cadence (every 16 months vs every 38 months). Logic Op's advantage is iOS requirement (15.3 vs 17.6). On ads, in-app purchases and device support there is nothing between them.

NRRS is free to download; Logic Op costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Logic Op ships an update every 38 months, NRRS every 16 months. The most recent releases landed on July 1, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Logic Op | NRRS |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/logic-op/id334567322/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 20.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 38 months | **Every 16 months** |
| Monetization | Paid | — |
| Size | 27 MB | 3 MB |
| Requires iOS | **15.3** | 17.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Sigma Sky, LLC](https://appshunter.io/developer/320947305) | [Answers4Families](https://appshunter.io/developer/530164780) |

## What reviewers say

### Logic Op

[App page](https://appshunter.io/ios/app/logic-op/id334567322)

This pocket reference provides essential information and examples for basic digital logic concepts. It covers logic gates, Boolean logic, flip-flops, Karnaugh maps, number conversions, and two's complement arithmetic.

**Highlights:** Logic Gates references and examples, Boolean Logic references and examples, Flip-Flops references, Karnaugh Maps with solvers, Number Conversion with solvers, Two's Complement solver

**Features:** macOS Compatibility

**In-app purchases:** none


### NRRS

[App page](https://appshunter.io/ios/app/nrrs/id1490934580)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Logic Op free?

Logic Op costs $2.99, with no in-app purchases.

### Is NRRS free?

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

### Do Logic Op or NRRS have ads?

Neither Logic Op nor NRRS shows ads.

### Which is updated more often, Logic Op or NRRS?

Logic Op ships an update every 38 months, and NRRS every 16 months. Most recently, Logic Op was updated on July 1, 2026 and NRRS on October 8, 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.*