Comparison

Deflection Lite vs CRSI Rebar Reference

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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.

About

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.

Highlights
  • 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
Features
Read full description

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

Deflection Lite4 screens
CRSI Rebar Reference4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. CRSI Rebar Reference sells 3 one-off in-app purchases. Deflection Lite asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard5 real differences · 5 level
Deflection Lite versus CRSI Rebar Reference: the parameters behind the verdict, then further details
ParameterDeflection LiteCRSI Rebar Reference
PriceFreeFree
Rating4.5 (46 ratings) — better3.3 (16 ratings)
Positive reviews44.4% of reviews — better33.3% of reviews
Number of ratings46 — better16
Update frequencyEvery 3 monthsEvery 5 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.0 — better15.1
Further details — not scored
Size108 MB51 MB
Age rating4+17+
DeveloperBlue KetchepConcrete Reinforcing Steel Institute

Customer experience

Deflection Lite

All ratings46 ratings
Positive82.6%
Neutral10.9%
Negative6.5%
Written reviews9 reviews
Positive44.4%
Neutral0.0%
Negative55.6%

CRSI Rebar Reference

All ratings16 ratings
Positive50.0%
Neutral12.5%
Negative37.5%
Written reviews9 reviews
Positive33.3%
Neutral11.1%
Negative55.6%

In-app purchases

None

Deflection Lite

No in-app purchases

3 purchases

CRSI Rebar Reference

One-time3
  • CRSI - Rebar Identifier Module$2.99
  • CRSI Development Length ACI$4.99
  • CRSI Development length AASHTO$4.99

Questions

Is Deflection Lite free?
Deflection Lite is free to download, with no in-app purchases.
Is CRSI Rebar Reference free?
CRSI Rebar Reference is free to download, with in-app purchases available.
Which has better reviews, Deflection Lite or CRSI Rebar Reference?
Deflection Lite is rated higher. Deflection Lite averages 4.5 out of 5 from 46 ratings, while CRSI Rebar Reference averages 3.3 from 16 ratings.
Do Deflection Lite or CRSI Rebar Reference have ads?
Neither Deflection Lite nor CRSI Rebar Reference shows ads.
Which is updated more often, Deflection Lite or CRSI Rebar Reference?
Deflection Lite ships an update every 3 months, and CRSI Rebar Reference every 5 weeks. Most recently, Deflection Lite was updated on September 17, 2026 and CRSI Rebar Reference on June 1, 2026.

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