# Concrete Engineering vs SN Requerido

The clearest difference is in-app purchases: SN Requerido at none against Concrete Engineering's 1. SN Requerido also leads on update cadence (every 4 weeks vs every 7 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Concrete Engineering sells 1 one-off in-app purchase. SN Requerido asks for nothing beyond the download.

Concrete Engineering ships an update every 7 months, SN Requerido every 4 weeks. The most recent releases landed on September 18, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | Concrete Engineering | SN Requerido |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (7 ratings)](https://appshunter.io/ios/app/concrete-engineering-lite/id1132557710/reviews)** | — |
| Number of ratings | **7** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Every 7 months | **Every 4 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 8 MB | 14 MB |
| Requires iOS | 18.6 | **17.6** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [V PUGAZHENTHI](https://appshunter.io/developer/491898049) | [Juan Javier Baba Toyofuko](https://appshunter.io/developer/1704391092) |

## What reviewers say

### Concrete Engineering

[App page](https://appshunter.io/ios/app/concrete-engineering-lite/id1132557710)

This app provides a comprehensive suite of calculators for concrete and civil engineering parameters. It features smart auto-fill options, a detailed calculation history with PDF export, and direct references to ACI codes. Unlock all 56 calculators with a one-time purchase.

**Highlights:** 56 concrete and civil engineering calculators, Metric and Imperial unit support, Detailed formulas for all calculations, Smart auto-fill pickers, Calculation history with PDF export, ACI 318-19 code references

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Concrete Engineering Calc. | $3.99 | one-time |


### SN Requerido

[App page](https://appshunter.io/ios/app/sn-requerido/id6463456591)

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

**In-app purchases:** none


## Frequently asked questions

### Is Concrete Engineering free?

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

### Is SN Requerido free?

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

### Do Concrete Engineering or SN Requerido have ads?

Both Concrete Engineering and SN Requerido show ads.

### Which is updated more often, Concrete Engineering or SN Requerido?

Concrete Engineering ships an update every 7 months, and SN Requerido every 4 weeks. Most recently, Concrete Engineering was updated on September 18, 2026 and SN Requerido on September 19, 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.*