Comparison

CTisus iPearls vs Lung CT Field Guide

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

Head to head
About

CTisus iPearls

This app provides diagnostic radiologists with valuable insights and facts, known as "pearls," to aid in correct diagnoses and understanding of radiologic images. It organizes these pearls across 28 popular categories and includes a search feature for easy access to thousands of pieces of knowledge.

Highlights
  • Diagnostic radiology pearls
  • Thousands of insights
  • 28 popular categories
  • Search functionality
  • Radiologic image understanding
Features
Read full description

To most people, pearls are considered precious gems, and are among the most popular jewels in the world. It should not be surprising that physicians consider a priceless bit of knowledge about their specialty a "pearl". For the diagnostic radiologist, a pearl may be the formerly elusive insight or fact that paves the way for a correct diagnosis or deeper understanding of a radiologic image. A traditional component of radiology education, pearls are considered on a par with elements such as the teaching file or lecture series. Pearls have also been a mainstay of www.CTISUS.com, where we post approximately 150 to 300 new pearls each month. In this app, we present pearls across 29 of the most popular categories derived from the literature or our imaging experiences. The app also provides a search feature to enhance user interactivity. We look forward to sharing these new insights with you on the latest version where we present literally thousands of pearls.

About

Lung CT Field Guide

This app helps physicians, especially radiologists and pulmonologists, interpret lung CT scans. It features a library of CT images and illustrations of lung diseases, along with an experimental engine to suggest differential diagnoses based on observed findings.

Highlights
  • Lung CT image library
  • Color graphic illustrations of lung disease patterns
  • Experimental differential diagnosis engine
  • Organized by CT findings and distribution
  • Over 100 curated images and illustrations
Features
Read full description

Introducing the Lung CT Field Guide app, an excellent resource for a wide-range of physician specialists, in particular radiologists and pulmonologists. One of the critical steps in interpreting a lung CT is identifying and appropriately describing imaging findings in the lung. Review and explore lung CT images and color graphic illustrations of the fundamental patterns of lung disease on CT. Play with an experimental diagnosis engine that will try to suggest a differential diagnosis list to consider with any number and combination of lung CT findings! Includes over 100 carefully curated CT images and color graphic illustrations. An invaluable resource for staff physicians, fellow physicians, resident physicians, and medical students at an unmatched price. Browse · Over 60 prototypical lung CT images, organized by: increased attenuation findings, decreased attenuation findings, miscellaneous findings, craniocaudal distribution, and axial distribution · Nearly 60 color graphic illustrations of prototypical lung CT imaging features Discover · Experimental diagnosis engine takes your lung CT observations and will try to suggest a differential diagnosis list to consider - for educational purposes only Requirements · Requires a device with iOS 7 or later

Screenshots

CTisus iPearls4 screens
Lung CT Field Guide4 screens

Verdict

The call

The clearest difference is rating: Lung CT Field Guide at 5.0 against CTisus iPearls's 4.7. Lung CT Field Guide also leads on iOS requirement (8.0 vs 15.6). CTisus iPearls's advantage is ratings volume (42 vs 11). On price, review sentiment, update cadence and ads 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. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Lung CT Field Guide holds the better App Store score, 5.0 against 4.7. Both are backed by a comparable volume of ratings — 42 and 11 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 6 months. The most recent releases landed on October 29, 2026 and October 14, 2026 respectively.

Scorecard3 real differences · 7 level
CTisus iPearls versus Lung CT Field Guide: the parameters behind the verdict, then further details
ParameterCTisus iPearlsLung CT Field Guide
PriceFreeFree
Rating4.7 (42 ratings)5.0 (11 ratings) — better
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings42 — better11
Update frequencyEvery 6 monthsEvery 6 months
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.68.0 — better
Further details — not scored
Size137 MB58 MB
Age rating17+12+
DeveloperElliot FishmanRADIOLOGiQ, LLC

Customer experience

CTisus iPearls

All ratings39 ratings
Positive92.3%
Neutral0.0%
Negative7.7%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Lung CT Field Guide

All ratings11 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews4 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

CTisus iPearls

No in-app purchases

None

Lung CT Field Guide

No in-app purchases

Questions

Is CTisus iPearls free?
CTisus iPearls is free to download, with no in-app purchases.
Is Lung CT Field Guide free?
Lung CT Field Guide is free to download, with no in-app purchases.
Which has better reviews, CTisus iPearls or Lung CT Field Guide?
Lung CT Field Guide is rated higher. CTisus iPearls averages 4.7 out of 5 from 42 ratings, while Lung CT Field Guide averages 5.0 from 11 ratings.
Do CTisus iPearls or Lung CT Field Guide have ads?
Neither CTisus iPearls nor Lung CT Field Guide shows ads.
Which is updated more often, CTisus iPearls or Lung CT Field Guide?
CTisus iPearls ships an update every 6 months, and Lung CT Field Guide every 6 months. Most recently, CTisus iPearls was updated on October 29, 2026 and Lung CT Field Guide on October 14, 2026.

Other comparisons