# CRSI Rebar Reference — Ready reference data for rebar > Reference app for ASTM standard reinforcing bars (rebar) specifications and details. (iPhone/iPad app by Concrete Reinforcing Steel Institute.) - Source: https://appshunter.io/ios/app/crsi-rebar-reference/id1423271565 (this page in markdown: same URL + `.md`) - Developer: [Concrete Reinforcing Steel Institute](https://appshunter.io/developer/1423271564) - Category: Productivity, Utilities - Price: Free with in-app purchases - Rating: 3.30/5 from 16 App Store ratings · 9 written reviews indexed - Age rating: 17+ - Requires: iOS 15.1 · 51 MB - Languages: American English - Released: 2018-08-15 - Data updated: 2026-06-01 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/crsi-rebar-reference/id1423271565/reviews.md ## What is CRSI Rebar Reference? QUICK REFERENCE! This ready reference app from the Concrete Reinforcing Steel Institute is a handy desk and field resource and includes information on ASTM standard reinforcing bars (rebar), standard hook details, standard stirrup/tie hook details, and ASTM reinforcing bar marking requirements. The app provides standard rebar specifications including sizes, diameters, areas and weights along with 90-, 135- and 180-degree hook details. Minimum yield and minimum tensile requirements per ASTM are also included. Industry standard bar markings for inch-pound rebar is illustrated for grades 40, 50, 60, 75, 80, 100 (A615), 100 (A1035), and 120. Links to the CRSI’s online resources are included. ## Key features - 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 ## Pricing and in-app purchases Base price: Free. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | CRSI - Rebar Identifier Module | $2.99 | one-time | | CRSI Development Length ACI | $4.99 | one-time | | CRSI Development length AASHTO | $4.99 | one-time | ## Recent user reviews (9 of 9) All indexed reviews: https://appshunter.io/ios/app/crsi-rebar-reference/id1423271565/reviews.md ### 1/5 — App Doesn’t work *2024-10-30* I paid and the app still doesn’t work. ### 1/5 — Premium Modules Don’t Work *2024-08-09* Had this app for year and development length calculator worked great. Then, I couldn’t access it and could buy another. After buying new phone, I was able to purchase premium app again. But after purchasing, it still doesn’t work ### 1/5 — Useless App because you can’t sign in *2024-06-13* The app requires separate account from the web version and if you try to create a sign in at the app then none of the buttons work and you can’t make an account. Giving up after trying so many times. ### 3/5 — Sign-in *2021-10-07* Why would this app start with a sign-in screen? The information it provides to the user does not depend on who that user is. Are they trying to track me? I just choose “guest,” but that is still an extra click before I see what I came for. Also, the text of that sign-in page overflows to both the left and right sides of my small screen, so you can tell they just tested the app on more capable hardware. Other than those complaints, it performs as advertised. ### 5/5 — Updated to 5 star *2021-03-13* New version fixed problem! **Developer response:** Hello, we are sincerely sorry for the issue you have encountered with our app. We have recently released a new version (3.0) with a number of bug fixes. Will you please delete and reinstall or update the CRSI Rebar Reference app. In some cases, you may be prompted to purchase the premium modules you have already paid for, but if you continue with the purchase you will not be billed a second time. Please contact us directly if you have any issues at crsi@crsi.org. If the modules are displaying correctly, please consider revising your rating as we address these issues. Thanks! ### 1/5 — Does not work *2021-02-26* Development length calculator does not work. Please fix or provide me a refund **Developer response:** Hello, we are sincerely sorry for the issue you have encountered with our app. We have recently released a new version (3.0) with a number of bug fixes. Will you please delete and reinstall or update the CRSI Rebar Reference app. In some cases, you may be prompted to purchase the premium modules you have already paid for, but if you continue with the purchase you will not be billed a second time. Please contact us directly if you have any issues at crsi@crsi.org. If the modules are displaying correctly, please consider revising your rating as we address these issues. Thanks! ### 2/5 — Lap splice calculator bugs *2020-07-29* All the options for input in the lap splice calculator are blank making this app useless. Please fix it because this feature is a paid one. Thanks. **Developer response:** Hello, we are sincerely sorry for the issue you have encountered with our app. We have recently released a new version (3.0) with a number of bug fixes. Will you please delete and reinstall or update the CRSI Rebar Reference app. In some cases, you may be prompted to purchase the premium modules you have already paid for, but if you continue with the purchase you will not be billed a second time. Please contact us directly if you have any issues at crsi@crsi.org. If the modules are displaying correctly, please consider revising your rating as we address these issues. Thanks! ### 5/5 — CRSI Mobile App *2019-08-20* Great, easy app to have in my pocket for job site visits!!!!! ### 5/5 — Great Tool *2018-10-23* This is the official CRSI app ! Must have for anyone working with steel reinforcing bars. ## Frequently asked questions about CRSI Rebar Reference ### What rebar grades does CRSI Rebar Reference support for bar markings? CRSI Rebar Reference illustrates industry standard bar markings for inch-pound rebar in grades 40, 50, 60, 75, 80, 100 (A615), 100 (A1035), and 120. ### What hook details are included in CRSI Rebar Reference? The app provides details for standard 90-, 135-, and 180-degree hooks, as well as standard stirrup/tie hook details. ### Does CRSI Rebar Reference offer offline access to data? The description does not specify offline access, but it is designed as a quick reference, suggesting it may be usable without a constant internet connection for its core data. ### What are the minimum yield and tensile requirements covered by CRSI Rebar Reference? CRSI Rebar Reference includes minimum yield and minimum tensile requirements per ASTM standards for reinforcing bars. ### How often is CRSI Rebar Reference updated? The app was last updated on October 31, 2025, indicating regular maintenance and updates to ensure data accuracy and compatibility. ### What is the age rating for CRSI Rebar Reference? CRSI Rebar Reference has an age rating of 17+, which is typical for technical reference applications. ### Does CRSI Rebar Reference have ads? No, CRSI Rebar Reference does not contain advertisements. ### What devices is CRSI Rebar Reference compatible with? CRSI Rebar Reference is available for iPhone, iPad, and iPod devices. ## Version history (last 5 releases) ### 3.3.3 — 2025-10-31 Minor bug fixing. ### 3.3.2 — 2025-10-29 Minor bug fixing. ### 3.3.1 — 2025-10-15 Minor Bug fixing. ### 3.3.0 — 2024-06-18 Minor bug fixes ### 3.2.9 — 2024-06-06 Minor bug fixing. ## Apps similar to CRSI Rebar Reference | App | Rating | Price | Category | | --- | --- | --- | --- | | [Metal World](https://appshunter.io/ios/app/metal-world/id480664274) | 4.8 (5) | Free | Productivity | | [Weight Calculators](https://appshunter.io/ios/app/weight-calculators/id598623344) | 5.0 (2) | Free | Productivity | | [Deflection Lite](https://appshunter.io/ios/app/deflection-lite/id974474071) | 4.5 (46) | $0.99 | Productivity | | [Beam HPC](https://appshunter.io/ios/app/beam-hpc/id1447917199) | 4.0 (4) | Free | Productivity | | [Constropedia Steel BBS Calc](https://appshunter.io/ios/app/constropedia-steel-bbs-calc/id1606618896) | 3.8 (4) | Free | Productivity | | [Compare Flow](https://appshunter.io/ios/app/compare-flow/id581217854) | 4.6 (5) | Free | Productivity | ## Related topics [crsi rebar reference](https://appshunter.io/ios/topics/crsi-rebar-reference) · [isobars](https://appshunter.io/ios/topics/isobars) · [rebar cloud](https://appshunter.io/ios/topics/rebar-cloud) · [rebary](https://appshunter.io/ios/topics/rebary) · [rebar](https://appshunter.io/ios/topics/rebar) · [concrete reinforcement](https://appshunter.io/ios/topics/concrete-reinforcement) · [rebar calc](https://appshunter.io/ios/topics/rebar-calc) · [allbars](https://appshunter.io/ios/topics/allbars) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-01.*