# CRSI Rebar Reference vs TBM Post Tension

The clearest difference is in-app purchases: TBM Post Tension at none against CRSI Rebar Reference's 3. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. CRSI Rebar Reference sells 3 one-off in-app purchases. TBM Post Tension asks for nothing beyond the download.

CRSI Rebar Reference ships an update every 5 weeks, TBM Post Tension every 3 months. The most recent releases landed on October 21, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | CRSI Rebar Reference | TBM Post Tension |
| --- | --- | --- |
| 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 | **No** |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 3 months |
| Monetization | Free | — |
| Size | 51 MB | 23 MB |
| Requires iOS | **15.1** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Concrete Reinforcing Steel Institute](https://appshunter.io/developer/1423271564) | [binni](https://appshunter.io/developer/1462593460) |

## 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 |


### TBM Post Tension

[App page](https://appshunter.io/ios/app/tbm-post-tension/id1590857983)

**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 TBM Post Tension free?

TBM Post Tension is free to download, with no in-app purchases.

### Do CRSI Rebar Reference or TBM Post Tension have ads?

Neither CRSI Rebar Reference nor TBM Post Tension shows ads.

### Which is updated more often, CRSI Rebar Reference or TBM Post Tension?

CRSI Rebar Reference ships an update every 5 weeks, and TBM Post Tension every 3 months. Most recently, CRSI Rebar Reference was updated on October 21, 2026 and TBM Post Tension on October 27, 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.*