CRSI Rebar Reference vs Spyder Wall
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
CRSI Rebar Reference
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.
- 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
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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.
Spyder Wall
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Spyder Wall is a structural engineering design tool to analyze Cantilever Retaining Walls with a large selection of loading and design options.
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Verdict
The clearest difference is price: CRSI Rebar Reference at Free against Spyder Wall's $5.99. CRSI Rebar Reference also leads on update cadence (every 5 weeks vs every 5 months) and iOS requirement (15.1 vs 17.5). Spyder Wall's advantage is in-app purchases (none vs 3). On ads 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
CRSI Rebar Reference is free to download; Spyder Wall costs $5.99 up front. CRSI Rebar Reference sells 3 one-off in-app purchases. Spyder Wall asks for nothing beyond the download.
CRSI Rebar Reference ships an update every 5 weeks, Spyder Wall every 5 months. The most recent releases landed on June 1, 2026 and September 16, 2026 respectively.
| Parameter | CRSI Rebar Reference | Spyder Wall |
|---|---|---|
| Price | Free — better | $5.99 |
| Rating | 3.3 (16 ratings) — better | — |
| Positive reviews | 33.3% of reviews | — |
| Number of ratings | 16 — better | — |
| Update frequency | Every 5 weeks — better | Every 5 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.1 — better | 17.5 |
| Further details — not scored | ||
| Size | 51 MB | 177 MB |
| Age rating | 17+ | 4+ |
| Developer | Concrete Reinforcing Steel Institute | Charles Roberts |
In-app purchases
CRSI Rebar Reference
- CRSI - Rebar Identifier Module$2.99
- CRSI Development Length ACI$4.99
- CRSI Development length AASHTO$4.99
Spyder Wall
No in-app purchases
Questions
Is CRSI Rebar Reference free?
Is Spyder Wall free?
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Which is updated more often, CRSI Rebar Reference or Spyder Wall?
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