# Compare Flow vs CRSI Rebar Reference

The clearest difference is rating: Compare Flow at 4.6 against CRSI Rebar Reference's 3.3. Compare Flow also leads on in-app purchases (none vs 3) and review sentiment (50% vs 33%). CRSI Rebar Reference's advantage is update cadence (every 5 weeks vs every 32 months) and ratings volume (16 vs 5). On price, ads, monetization model and device support there is nothing between them.

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

Compare Flow holds the better App Store score, 4.6 against 3.3. Both are backed by a comparable volume of ratings — 5 and 16 respectively. Written reviews point the same way: 50% of Compare Flow's written reviews are positive against 33% of CRSI Rebar Reference's.

Compare Flow ships an update every 32 months, CRSI Rebar Reference every 5 weeks. The most recent releases landed on September 17, 2026 and June 1, 2026 respectively.

## The numbers

| Metric | Compare Flow | CRSI Rebar Reference |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (5 ratings)](https://appshunter.io/ios/app/compare-flow/id581217854/reviews)** | [3.3 (16 ratings)](https://appshunter.io/ios/app/crsi-rebar-reference/id1423271565/reviews) |
| Number of ratings | 5 | **16** |
| Positive reviews | **50.0% of reviews** | 33.3% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 32 months | **Every 5 weeks** |
| Monetization | Free | Free |
| Size | 23 MB | 51 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [iENGINEERING Corporation](https://appshunter.io/developer/419618955) | [Concrete Reinforcing Steel Institute](https://appshunter.io/developer/1423271564) |

## What reviewers say

### Compare Flow

[App page](https://appshunter.io/ios/app/compare-flow/id581217854)

This application helps engineers and designers evaluate the hydraulic flow capacity of various non-pressure sewer pipe types. It allows for comparisons between different pipe geometries and materials, including concrete, thermoplastic, and metal options.

**Highlights:** Manning's Formula calculation, Compare hydraulic flow capacity, Evaluate pipe geometry alternatives, Compare pipe material options, Supports concrete, thermoplastic, and metal pipes, Circular, elliptical, arch, and box sections

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 Compare Flow free?

Compare Flow is free to download, with no in-app purchases.

### Is CRSI Rebar Reference free?

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

### Which has better reviews, Compare Flow or CRSI Rebar Reference?

Compare Flow is rated higher. Compare Flow averages 4.6 out of 5 from 5 ratings, while CRSI Rebar Reference averages 3.3 from 16 ratings.

### Do Compare Flow or CRSI Rebar Reference have ads?

Neither Compare Flow nor CRSI Rebar Reference shows ads.

### Which is updated more often, Compare Flow or CRSI Rebar Reference?

Compare Flow ships an update every 32 months, and CRSI Rebar Reference every 5 weeks. Most recently, Compare Flow was updated on September 17, 2026 and CRSI Rebar Reference on June 1, 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.*