Comparison

Deflection vs LightPDF Scanner

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

Head to head
About

Deflection

Calculate structural behavior for beams, 2D trusses, and 2D frames. Visualize reaction forces, shear, bending moment, and deflection. Analyze internal stresses along the beam and cross-section.

Highlights
  • Beam, 2D truss, and 2D frame analysis
  • Graphical output of results
  • Internal shear and bending stress calculation
  • 2D frame and truss editor
  • Cross-section editor with automatic calculations
  • Built-in database and quick-start templates
Features
Read full description

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. 2D FRAME AND TRUSS EDITOR 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. INTERNAL STRESSES 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. CROSS SECTION EDITOR Edit built-in cross sections. Moment of inertia and area values are automatically calculated and applied to the rest of the beam calculations. MORE FEATURES • The built-in database contains more data for your reference and convenience. • Apply beam self-weight optionally • Unlimited design files • Quick-start templates CONTACT We like to hear from you! Please email contact@ketchep.com if you have any issues, questions, or comments.

About

LightPDF Scanner

Transform your mobile device into a powerful scanner. Easily capture documents, photos, and papers, converting them into high-quality PDFs or other formats. Edit, extract text with OCR, and create professional ID photos on the go.

Highlights
  • Scan documents, photos, and papers
  • Convert to PDF, Word, Excel, TXT, JPG
  • Extract text with OCR (20+ languages)
  • Edit PDFs: annotate, e-sign, merge
  • Create and edit ID photos
  • Remove handwriting from papers
  • Batch scanning
Read full description

Say goodbye to huge and heavy copy machines, and say hello to your mobile phone by using the powerful scanner app LightPDF Scanner. Simply take a photo of the file, and the app will automatically convert it into a high-quality PDF file. Easy and fast to create quality scans on the go. ------------------------- Key Features: Document Scanner: 1. Scan Files - Scan anything you need, books, papers, contracts, notes, photos... - Unique smart calibration technology helps to correct image distortion and cluttered background, ensuring quality scans. - Batch scanning lets you scan multiple documents into one single file, saving you from the hassle of combining them manually. 2. Scan IDs - ID Card & Passport mode is specifically designed for fast scans of ID photos, saving you a trip to the print shop. - ID info is 100% confidential, only visible to you. PDF Converter & Editor: 1. File Converter - This PDF scanner saves any of your scans as PDF, Word, Excel, TXT, and JPG. - The converted files retain the original layout of text, images and tables, ensuring a seamless transition. 2. PDF Editor - There is a variety of editing tools for further modifying: add, delete, merge, annotate, e-sign, and highlight. - The AI Retouch mode harness the power of AI to remove sensitive or private info from the file. 3. Text Recognition (OCR) - Extract text from PDFs and uneditable images swiftly, copy text with a single tap, or export it as a TXT file for editing the text. - Supports 20+ languages including Simplified Chinese, Traditional Chinese, English, Japanese, Spanish, French, and more. ID Photo Assistant: 1. Taking ID Photos - The ID mode supports commonly-used ID sizes, including passports for US, UK, Japan, and Visa for US and EU. - Automatically remove backgrounds, and offer various colors, specifications, and filters for good-looking ID photos. 2. Fix Blurry Image - The new Unblur Image mode rescues you from blurred photos, improving image quality in a simple tap. Essential Learning Tools: 1. Erase Handwriting - Automatically removes handwritings from test papers, giving you a completely blank new paper. - Save you from the mistakes you made in your study. 2. Scan Books - Easily convert books, materials, notes into e-books. Access them on the go anytime, anywhere, making learning efficient and flexible. 3. Convert Handwriting To Text - Take photos of blackboard or whiteboard notes, the app automatically converts them into texts, helping you organize and backup your notes efficiently, saving time in taking note in the class. Quick Share & Send 1. Share the file in the format you need, PDF, JPG, TXT, etc. 2. Email scans as attachments. 3. Share with other by social media and messaging apps. 4. Print directly from our scanner app. ------------------------- Use Cases: 1. Students: Organize lecture notes, collect study materials, submit homework, collaborate in group studies and create ID photos. 2. Teachers: Archive assignments, prepare teaching materials, share educational content with students and their parents. 3. Office Use: Digitize paper contracts, meeting notes, and other imprtant documents for easy archiving, managment, and collaboration; sign document anywhere, and share project materials across departments. Subscription Service: 1. Periods: 1 Month, 1 Year, 3 Years. 2. Pricing: $4.99/month with a 3-Day Free Trial. Continuous subscription, cancel anytime. $9.99/year, continuous subscription, cance anytime. $19.99/3 years, one-time payment, non-renewing. 3. Subscription fees are charged directly from your account. 4. To cancel the auto-renewal, manually turn off the service in Apple ID Settings at least 24 hours before the subscription expires. 5. Terms of Service: https://lightpdf.com/lightpdf-scanner-terms 6. Privacy Policy: https://lightpdf.com/lightpdf-scanner-privacy We'd love to hear your feedback! Email us at support@lightpdf.com Follow us on Twitter: @LightPdf Follow us on Facebook: Lightpdf

Screenshots

Deflection4 screens
LightPDF Scanner4 screens

Verdict

The call

The clearest difference is price: LightPDF Scanner at Free against Deflection's $4.99. LightPDF Scanner also leads on update cadence (every 11 days vs every 6 weeks). Deflection's advantage is rating (4.6 vs 4.0) and in-app purchases (none vs 6). On review sentiment, ads, device support and iOS requirement 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

LightPDF Scanner is free to download; Deflection costs $4.99 up front. LightPDF Scanner sells 6 in-app purchases, starting at $4.99 per month. Deflection asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Deflection holds the better App Store score, 4.6 against 4.0. That said, the two scores are not equally well evidenced: Deflection has 115 ratings behind it against 14, so its average is the more settled of the two. Written reviews complicate that: 74% of Deflection's written reviews are positive against 79% of LightPDF Scanner's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Deflection ships an update every 6 weeks, LightPDF Scanner every 11 days. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

Scorecard6 real differences · 4 level
Deflection versus LightPDF Scanner: the parameters behind the verdict, then further details
ParameterDeflectionLightPDF Scanner
Price$4.99Free — better
Rating4.6 (115 ratings) — better4.0 (14 ratings)
Positive reviews73.6% of reviews79.5% of reviews — better
Number of ratings115 — better14
Update frequencyEvery 6 weeksEvery 11 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS15.014.0 — better
Further details — not scored
Size160 MB125 MB
Age rating4+4+
DeveloperBlue KetchepWangxu Technology Co., Ltd

Customer experience

Deflection

All ratings115 ratings
Positive90.4%
Neutral4.3%
Negative5.2%
Written reviews91 reviews
Positive73.6%
Neutral8.8%
Negative17.6%

LightPDF Scanner

All ratings14 ratings
Positive78.6%
Neutral0.0%
Negative21.4%
Written reviews39 reviews
Positive79.5%
Neutral0.0%
Negative20.5%

In-app purchases

None

Deflection

No in-app purchases

6 purchases

LightPDF Scanner

Subscriptions4
  • Monthly Subscription3 Days trial$4.991 Month
  • Monthly Bundle Plan$5.991 Month
  • Yearly Bundle Plan$9.991 Year
Show 1 more
  • Annual Subscription$9.991 Year
One-time2
  • Apowersoft Scanner (3 Years)$19.99
  • 3-year Membership$19.99

Questions

Is Deflection free?
Deflection costs $4.99, with no in-app purchases.
Is LightPDF Scanner free?
LightPDF Scanner is free to download, with in-app purchases available.
Which has better reviews, Deflection or LightPDF Scanner?
Deflection is rated higher. Deflection averages 4.6 out of 5 from 115 ratings, while LightPDF Scanner averages 4.0 from 14 ratings.
Do Deflection or LightPDF Scanner have ads?
Neither Deflection nor LightPDF Scanner shows ads.
Which is updated more often, Deflection or LightPDF Scanner?
Deflection ships an update every 6 weeks, and LightPDF Scanner every 11 days. Most recently, Deflection was updated on November 1, 2026 and LightPDF Scanner on November 3, 2026.

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