# Civil Engineering Professional vs CRSI Rebar Reference

The clearest difference is price: CRSI Rebar Reference at Free against Civil Engineering Professional's $9.99. CRSI Rebar Reference also leads on review sentiment (33% vs 0%) and update cadence (every 5 weeks vs every 7 months). On ads, in-app purchases and device support there is nothing between them.

CRSI Rebar Reference is free to download; Civil Engineering Professional costs $9.99 up front. Civil Engineering Professional sells 1 one-off in-app purchase and CRSI Rebar Reference sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Civil Engineering Professional ships an update every 7 months, CRSI Rebar Reference every 5 weeks. The most recent releases landed on November 1, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | Civil Engineering Professional | CRSI Rebar Reference |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | — | **[3.3 (16 ratings)](https://appshunter.io/ios/app/crsi-rebar-reference/id1423271565/reviews)** |
| Number of ratings | — | **16** |
| Positive reviews | 0.0% of reviews | **33.3% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 5 weeks** |
| Monetization | Paid | **Free** |
| Size | 17 MB | 51 MB |
| Requires iOS | 18.6 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Historycentral.com](https://appshunter.io/developer/1744330560) | [Concrete Reinforcing Steel Institute](https://appshunter.io/developer/1423271564) |

## What reviewers say

### Civil Engineering Professional

[App page](https://appshunter.io/ios/app/civil-engineering-professional/id390275942)

This app provides civil engineers and students with a comprehensive collection of over 1,000 essential formulas, conversion tools, and professional reference tables. It covers a wide range of civil engineering topics, from structural design to soil mechanics, with support for both US and SI units.

**Highlights:** Over 1,000 civil engineering formulas, 700 conversion formulas, 56 temperature scale conversions, 6 professional reference tables, US and SI unit switching, Calculation history, Feedback for new content

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Civil Engineering Pro | $3.99 | one-time |


### CRSI Rebar Reference

[App page](https://appshunter.io/ios/app/crsi-rebar-reference/id1423271565)

Access essential data for reinforcing bars (rebar) including specifications, hook details, and marking requirements. This app serves as a quick reference for industry standards and links to online resources.

**Highlights:** ASTM standard reinforcing bar specifications, Standard hook details (90, 135, 180 degrees), Stirrup/tie hook details, ASTM reinforcing bar marking requirements, Minimum yield and tensile requirements, Links to CRSI online resources

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CRSI - Rebar Identifier Module | $2.99 | one-time |
| CRSI Development Length ACI | $4.99 | one-time |
| CRSI Development length AASHTO | $4.99 | one-time |


## Frequently asked questions

### Is Civil Engineering Professional free?

Civil Engineering Professional costs $9.99, and also offers in-app purchases.

### Is CRSI Rebar Reference free?

CRSI Rebar Reference is free to download, with in-app purchases available.

### Do Civil Engineering Professional or CRSI Rebar Reference have ads?

Neither Civil Engineering Professional nor CRSI Rebar Reference shows ads.

### Which is updated more often, Civil Engineering Professional or CRSI Rebar Reference?

Civil Engineering Professional ships an update every 7 months, and CRSI Rebar Reference every 5 weeks. Most recently, Civil Engineering Professional was updated on November 1, 2026 and CRSI Rebar Reference on November 2, 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.*