# Rebar Calc vs CSiRebar

Rebar Calc and CSiRebar both sit at 4.9 stars, but that hides the real split: 100% of CSiRebar's written reviews are positive against 60% of Rebar Calc's. CSiRebar also leads on ads (none vs shown) and update cadence (fortnightly vs every 2 months). Rebar Calc's advantage is ratings volume (643 vs 1). On price, rating, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 4.9 for Rebar Calc against 5.0 for CSiRebar. That said, the two scores are not equally well evidenced: Rebar Calc has 643 ratings behind it against 1, so its average is the more settled of the two. Written reviews are what separate them: 60% of Rebar Calc's written reviews are positive against 100% of CSiRebar's.

Rebar Calc ships an update every 2 months, CSiRebar fortnightly. The most recent releases landed on November 6, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | Rebar Calc | CSiRebar |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.9 (643 ratings)](https://appshunter.io/ios/app/rebar-calc/id1134344254/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/csirebar/id1435265034/reviews)** |
| Number of ratings | **643** | 1 |
| Positive reviews | 60.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | **Fortnightly** |
| Monetization | Ad-supported | **Free** |
| Size | 13 MB | 14 MB |
| Requires iOS | 18.0 | **9.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Appco LLC (USA)](https://appshunter.io/developer/1027562416) | [Computers and Structures, Inc.](https://appshunter.io/developer/1119970032) |

## What reviewers say

### Rebar Calc

[App page](https://appshunter.io/ios/app/rebar-calc/id1134344254)

This app simplifies concrete and rebar calculations for construction projects. It helps estimate rebar tonnage, mesh quantities, and concrete volume, and can even provide quotes for materials.

**Highlights:** Rebar tonnage calculation, Sheet and roll mesh estimation, Concrete volume estimator, Material quote generation, Adjustable lap amount, Configurable rebar/mesh size

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

**In-app purchases:** none


### CSiRebar

[App page](https://appshunter.io/ios/app/csirebar/id1435265034)

This app helps structural and civil engineers quickly convert between bar sizes, steel area, and spacing requirements. It supports ASTM, Metric, and Imperial standards, offering various reinforcement layout options for design and analysis.

**Highlights:** Converts bar sizes, steel area, and spacing, Supports ASTM, Metric, and Imperial standards, Generates multiple reinforcement layouts, Allows combined reinforcement layouts, User-defined rules for bar selection, Provides alternative reinforcement layouts

**In-app purchases:** none


## Frequently asked questions

### Is Rebar Calc free?

Rebar Calc is free to download, with no in-app purchases.

### Is CSiRebar free?

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

### Which has better reviews, Rebar Calc or CSiRebar?

CSiRebar is rated higher. Rebar Calc averages 4.9 out of 5 from 643 ratings, while CSiRebar averages 5.0 from 1 ratings.

### Do Rebar Calc or CSiRebar have ads?

Rebar Calc shows ads; CSiRebar does not.

### Which is updated more often, Rebar Calc or CSiRebar?

Rebar Calc ships an update every 2 months, and CSiRebar fortnightly. Most recently, Rebar Calc was updated on November 6, 2026 and CSiRebar 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.*