# CRSI Rebar Reference vs PDF Scanner

The clearest difference is device support: CRSI Rebar Reference at 3 against PDF Scanner's 1. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. CRSI Rebar Reference sells 3 one-off in-app purchases and PDF Scanner sells 2 in-app purchases, starting at $9.99 per 7 days. Whichever you choose, the download price is not the number that matters.

CRSI Rebar Reference ships an update every 5 weeks, PDF Scanner every 2 months. The most recent releases landed on October 4, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | CRSI Rebar Reference | PDF Scanner |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.3 (16 ratings)](https://appshunter.io/ios/app/crsi-rebar-reference/id1423271565/reviews)** | — |
| Number of ratings | **16** | — |
| Positive reviews | 33.3% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 2 months |
| Monetization | Free | — |
| Size | 51 MB | 18 MB |
| Requires iOS | **15.1** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [Concrete Reinforcing Steel Institute](https://appshunter.io/developer/1423271564) | [DASHING ENTERPRISES LIMITED](https://appshunter.io/developer/6792976544) |

## What reviewers say

### 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 |


### PDF Scanner

[App page](https://appshunter.io/ios/app/pdf-scanner-scan-pdf-and-docs/id6793353965)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Nova | $9.99 | per 7 days |
| Yearly Nova | $39.99 | per year |


## Frequently asked questions

### Is CRSI Rebar Reference free?

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

### Is PDF Scanner free?

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

### Do CRSI Rebar Reference or PDF Scanner have ads?

Neither CRSI Rebar Reference nor PDF Scanner shows ads.

### Which is updated more often, CRSI Rebar Reference or PDF Scanner?

CRSI Rebar Reference ships an update every 5 weeks, and PDF Scanner every 2 months. Most recently, CRSI Rebar Reference was updated on October 4, 2026 and PDF Scanner on October 17, 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.*