Deflection 4+

Frames, Trusses, & Beams

Blue Ketchep

    • 4.6 • 107 Ratings
    • $7.99



Deflection is a powerful, versatile calculator for beams, 2D trusses, and 2D frames. The interface is simple and intuitive, and the graphical output is state-of-the-art. In addition to reaction, shear, bending moment, and deflection results, Deflection also computes internal shear and bending stress along the cross section and along the beam.


The 2D editor is seamlessly integrated with the beam editor. Draw arbitrary frame and truss structures and apply loads and constraints using the same simple interface as for beams. You can visualize results directly within the 2D editor, or you can select a beam and get additional insights.


Obtain internal bending and shear stress diagrams in addition to shear, bending, and deflection diagrams. The internal stresses can be visualized along the length of the beam as well as along the vertical axis of the cross section using the beam editor.


Edit built-in cross sections. Moment of inertia and area values are automatically calculated and applied to the rest of the beam calculations.


• The built-in database contains more data for your reference and convenience.
• Apply beam self-weight optionally
• Unlimited design files
• Quick-start templates


We like to hear from you! Please email if you have any issues, questions, or comments.

What’s New

Version 9.0.0

• NEW: Shear, moment, and axial force diagrams can now be displayed for 2D frames and trusses. Use the buttons at the bottom of the screen to display or hide the diagrams.
• IMPROVED: On iPad, the side panel in the 2D editor can now be collapsed to make better use of screen space.
• FIXED: Minor issues.

Ratings and Reviews

4.6 out of 5
107 Ratings

107 Ratings

culown ,

I love this application so much.

If you are mechanical, civil engineer or chemical engineer or some, you should get this app.

This is really accurate and compact to use at site and office.

I really appreciate for this app to the developer.

You are my HERO.

8Way ,

Needs polishing

Kinda klunky interface. The calculator layout is poor. Calculator needs means of entering scientific notation. Missing aluminum extrusions. Should have a way to favorite beam shapes and add user defined ones. I prefer scientific notation normalized to be x.xx x10^x not xxx.x x10^x

Not sure why 10x length limitation.

Developer Response ,

Thank you very much for your detailed feedback and requests! We always have to make a tradeoff between polishing existing features and rolling out new ones, but over time we try to address all sharp corners, so thanks for pointing some of them out!

Regarding the 10X requirement: The equations that the app uses internally assume that the beam is "slender", meaning that the length-to-height ratio should be greater than 10. If you need to design for something shorter, you may need to use a different type of analysis tool. You can find a mention of this in the general Wikipedia article on Beam Deflection

faader4100 ,

Great Application for quick accurate beam evaluations

Great sanity check software before delving into a solid model evaluation

App Privacy

The developer, Blue Ketchep, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Linked to You

The following data may be collected but it is not linked to your identity:

  • User Content
  • Identifiers
  • Usage Data
  • Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    Up to six family members can use this app with Family Sharing enabled.

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