Deflection Lite vs CRSI Rebar Reference
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Deflection Lite
This app provides interactive and precise structural beam analysis. Easily visualize beam bending by dragging loads and supports, and calculate key engineering results like reactions, shear force, and bending moment.
- Interactive beam bending visualization
- Calculate reactions, shear force, and bending moment
- Built-in cross-section databases
- Unlimited loads and supports
- Export design to shareable permalink
- Metric and standard units
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Deflection Lite is the most interactive, fast, and precise app available for structural beam analysis. Simply drag loads and supports on the beam, and see how it bends. RESULTS Calculate reactions, shear force, bending moment, and beam deflection quickly and easily. CROSS SECTION DATABASES Specify elastic modulus and moment of inertia values directly, or find common shapes and materials using the built-in databases, which include most international steel sections, as well as some aluminum and wood shapes. UNLIMITED LOADS AND SUPPORTS Simply drag any load or support on the beam. • Concentrated point loads • Distributed loads • Moment loads • Simple supports • Fixed supports • Fixed hinges • Floating Gerber hinges OTHER FEATURES • Export your design to a permalink that you can share. • Automatic detection of local maxima and minima in diagrams • Metric and standard measurement units CONTACT We like to hear from you! Please email contact@ketchep.com if you have any issues, questions, or comments.
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.
Screenshots
Verdict
The clearest difference is rating: Deflection Lite at 4.5 against CRSI Rebar Reference's 3.3. Deflection Lite also leads on in-app purchases (none vs 3) and review sentiment (44% vs 33%). CRSI Rebar Reference's advantage is update cadence (every 5 weeks vs every 3 months). On price, ratings volume, 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
Both are free to download. CRSI Rebar Reference sells 3 one-off in-app purchases. Deflection Lite asks for nothing beyond the download.
Deflection Lite holds the better App Store score, 4.5 against 3.3. Both are backed by a comparable volume of ratings — 46 and 16 respectively. Written reviews point the same way: 44% of Deflection Lite's written reviews are positive against 33% of CRSI Rebar Reference's.
Deflection Lite ships an update every 3 months, CRSI Rebar Reference every 5 weeks. The most recent releases landed on September 17, 2026 and June 1, 2026 respectively.
| Parameter | Deflection Lite | CRSI Rebar Reference |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (46 ratings) — better | 3.3 (16 ratings) |
| Positive reviews | 44.4% of reviews — better | 33.3% of reviews |
| Number of ratings | 46 — better | 16 |
| Update frequency | Every 3 months | Every 5 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 108 MB | 51 MB |
| Age rating | 4+ | 17+ |
| Developer | Blue Ketchep | Concrete Reinforcing Steel Institute |
Customer experience
Deflection Lite
CRSI Rebar Reference
In-app purchases
Deflection Lite
No in-app purchases
CRSI Rebar Reference
- CRSI - Rebar Identifier Module$2.99
- CRSI Development Length ACI$4.99
- CRSI Development length AASHTO$4.99
Questions
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Is CRSI Rebar Reference free?
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