# CRSI Rebar Reference vs Spyder Wall

The clearest difference is price: CRSI Rebar Reference at Free against Spyder Wall's $5.99. CRSI Rebar Reference also leads on update cadence (every 5 weeks vs every 5 months) and iOS requirement (15.1 vs 17.5). Spyder Wall's advantage is in-app purchases (none vs 3). On ads and device support there is nothing between them.

CRSI Rebar Reference is free to download; Spyder Wall costs $5.99 up front. CRSI Rebar Reference sells 3 one-off in-app purchases. Spyder Wall asks for nothing beyond the download.

CRSI Rebar Reference ships an update every 5 weeks, Spyder Wall every 5 months. The most recent releases landed on June 1, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | CRSI Rebar Reference | Spyder Wall |
| --- | --- | --- |
| Price | **Free** | $5.99 |
| 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 | **No** |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 5 months |
| Monetization | Free | — |
| Size | 51 MB | 177 MB |
| Requires iOS | **15.1** | 17.5 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Concrete Reinforcing Steel Institute](https://appshunter.io/developer/1423271564) | [Charles Roberts](https://appshunter.io/developer/1760236245) |

## 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 |


### Spyder Wall

[App page](https://appshunter.io/ios/app/spyder-wall/id6745111487)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is CRSI Rebar Reference free?

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

### Is Spyder Wall free?

Spyder Wall costs $5.99, with no in-app purchases.

### Do CRSI Rebar Reference or Spyder Wall have ads?

Neither CRSI Rebar Reference nor Spyder Wall shows ads.

### Which is updated more often, CRSI Rebar Reference or Spyder Wall?

CRSI Rebar Reference ships an update every 5 weeks, and Spyder Wall every 5 months. Most recently, CRSI Rebar Reference was updated on June 1, 2026 and Spyder Wall on September 16, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*