Rebar Calc vs CSiRebar
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Rebar Calc
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.
- Rebar tonnage calculation
- Sheet and roll mesh estimation
- Concrete volume estimator
- Material quote generation
- Adjustable lap amount
- Configurable rebar/mesh size
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Rebar Calc is your all-in-one solution for rebar and concrete calculations. Whether you need to determine the tons and linear feet of rebar, sheets of sheet mesh, or rolls of roll mesh required for your concrete project, Rebar Calc has you covered. Tailor your calculations by configuring the necessary lap amount, and selecting the size of rebar, sheet mesh, or roll mesh to suit your specific needs. Rebar Calc also features a fast and easy concrete volume estimator in cubic yards. Quickly figure out how many bags of grout, fast-setting concrete, and other materials you'll need for slabs or concrete cores. Plus, with just a tap, you can get a quote on rebar, mesh, and other concrete supplies. Simplify your construction planning with Rebar Calc, the essential tool for every concrete job. These calculations are for estimating purposes only. All final figures should be verified by a professional before quoting, purchasing, or installing materials.
CSiRebar
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.
- 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
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CSiRebar is an app that conveniently converts between combinations of bar sizes, steel area, and spacing requirements. Application/Usage: • Convert between combinations of bar sizes, steel area, and spacing requirements • Select the required combination of bar sizes and spacing for given conversions using ASTM, Metric or Imperial standards Target Users: • Structural and civil engineers who need to view and select from various reinforcement layouts for a given criteria during member design • Structural and civil engineers who need to quickly get the area of steel provided in a given section during member analysis Key Features: • Generate many reinforcement layouts • Provide ability for combined reinforcement layouts • User-defined rules for bar selection • Provide several bar options for user-defined range Key Input: • Area • Bar size • Number of bars • Bar spacing • Combined reinforcement layouts Key Output: • Area for given reinforcement layouts • Reinforcement layouts for given bar options and spacing requirements • Alternative reinforcement layouts for given layouts
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Rebar Calc | CSiRebar |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (643 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 60.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 643 — better | 1 |
| Update frequency | Every 2 months | Fortnightly — better |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Ad-supported | Free — better |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 18.0 | 9.0 — better |
| Further details — not scored | ||
| Size | 13 MB | 14 MB |
| Age rating | 4+ | 4+ |
| Developer | Appco LLC (USA) | Computers and Structures, Inc. |
Customer experience
Rebar Calc
CSiRebar
In-app purchases
Rebar Calc
No in-app purchases
CSiRebar
No in-app purchases
Questions
Is Rebar Calc free?
Is CSiRebar free?
Which has better reviews, Rebar Calc or CSiRebar?
Do Rebar Calc or CSiRebar have ads?
Which is updated more often, Rebar Calc or CSiRebar?
Other comparisons
