Comparison

Flags Quiz vs Rad Index

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

Head to head
About

Flags Quiz

Features
Read full description

Flags help us to identify different countries around the world. A country's flag is made up of symbols, colors and sometimes phrases that represent its identity or character. This Flags quiz includes 180 unique flags. You will need to guess each time 20 random flags. Don't stop until you make 100% correct in every try! This app is ideal to test your knowledge and train your memory! You can always use the bulb button (upper-right corner) to get little help if the flag is too hard for you to guess. Have fun!

About

Rad Index

Features
Read full description

Radiographic positioning reference app for Radiographers, Radiologic Technologists and Radiography students. 147 clinical projection cards with separate DR and CR technical parameters, calculators, spaced repetition flashcards and ALARA checklist โ€” all offline. Built by a practicing Radiographer (TSRM). Clinical content peer-reviewed twice. Available in Italian, English and Spanish. โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€” RADIOGRAPHIC PROJECTIONS โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€” 147 cards across 8 anatomical regions: โ€ข Chest โ€” PA, lateral, obliques, trauma variants (cross-table, supine) โ€ข Skull โ€” PA, lateral, Waters, Caldwell, Towne, skull base, mastoids, orbits, sinuses โ€ข Spine โ€” cervical, thoracic, lumbar, sacrum, coccyx; trauma and stretcher variants โ€ข Upper limb โ€” fingers, hand, wrist, forearm, elbow, humerus, shoulder, clavicle, sternum, scapula โ€ข Lower limb โ€” toes, foot, calcaneus, ankle, tibia/fibula, knee, femur, hip, pelvis, patella โ€ข Abdomen โ€” supine, erect, decubitus โ€ข Pelvis โ€” AP, oblique projections โ€ข Long bone stitching โ€” full spine, full limb Each card: patient positioning, centering point, separate DR and CR parameters, image quality criteria, common errors, practical clinical notes. Collapsible DR/CR/PSP guide with Deviation Index (DI) formula and grid frequency table. โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€” STUDY & REVIEW โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€” โ€ข Flashcards with spaced repetition โ€ข 3 cards per projection: centering, DR parameters, patient position โ€ข Automatic daily sessions based on performance โ€ข Ideal for registry exams and clinical placement โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€” STUDY TOOLS โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€” โ€ข Interactive ALARA checklist (ICRP 147/2021) โ€ข Personal notes for each projection with auto-save โ€ข PDF export and share with zone-coloured header โ€ข Radiological glossary (All / Technical / Anatomy tabs) โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€” DESIGN & USABILITY โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€” โ€ข Full dark mode with dedicated zone colours โ€ข Adjustable text size: S / M / L / XL โ€ข Works completely offline โ€ข Available in Italian, English and Spanish โ€ข Quick search with filters (zone, level, notes) and history โ€ข Favourites and recents on home screen 14-day free trial โ€” no card required. Then a one-time purchase of โ‚ฌ9.99. No subscription, ever.

Screenshots

Flags Quiz4 screens
Rad Index4 screens

Verdict

The call

The clearest difference is ads: Rad Index at none against Flags Quiz's shown. Rad Index also leads on update cadence (fortnightly vs every 3 months). Flags Quiz's advantage is iOS requirement (12.0 vs 15.0). On price, in-app purchases and device support there is nothing between them.

Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Both are free to download. Flags Quiz sells 1 one-off in-app purchase and Rad Index sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Flags Quiz ships an update every 3 months, Rad Index fortnightly. The most recent releases landed on November 7, 2026 and October 31, 2026 respectively.

Scorecard3 real differences ยท 3 level
Flags Quiz versus Rad Index: the parameters behind the verdict, then further details
ParameterFlags QuizRad Index
PriceFreeFree
Update frequencyEvery 3 monthsFortnightly โ€” better
AdsYesNo โ€” better
In-app purchasesYesYes
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.0 โ€” better15.0
Further details โ€” not scored
Size780 MB39 MB
Age rating4+4+
DeveloperPerfect Consulting B.V.Simone Zen

In-app purchases

1 purchases

Flags Quiz

One-time1
  • Full version$2.99
1 purchases

Rad Index

One-time1
  • Rad Index Premium$8.99

Questions

Is Flags Quiz free?
Flags Quiz is free to download, with in-app purchases available.
Is Rad Index free?
Rad Index is free to download, with in-app purchases available.
Do Flags Quiz or Rad Index have ads?
Flags Quiz shows ads; Rad Index does not.
Which is updated more often, Flags Quiz or Rad Index?
Flags Quiz ships an update every 3 months, and Rad Index fortnightly. Most recently, Flags Quiz was updated on November 7, 2026 and Rad Index on October 31, 2026.

Other comparisons