Comparison

Building Atoms and Isotopes vs CDL Prep A+

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

Head to head
About

Building Atoms and Isotopes

Explore the composition of elements by building atoms, ions, and isotopes. Select the correct number of protons, neutrons, and electrons. Includes atomic theory information and an interactive periodic table on iPad.

Highlights
  • Build atoms, ions, and isotopes
  • Select protons, neutrons, and electrons
  • Atomic theory information
  • Interactive periodic table (iPad)
  • Element composition exploration
Features
Read full description

With the Building Atoms, Ions, and Isotopes app, explore the composition of the elements. Build atoms, ions, and isotopes by selecting appropriate numbers of protons, neutrons, and electrons. For reference, this app also includes atomic theory information and a periodic table that is interactive in the iPad version.

About

CDL Prep A+

Features
Read full description

Pass Your CDL Exam with Confidence! CDL Prep A+ is your ultimate study companion for the Commercial Driver's License (CDL) exam. Whether you're just starting or need to brush up on your knowledge, this app provides everything you need to succeed. With a vast collection of practice questions covering all CDL test areas, realistic test simulations, and detailed answer explanations, you'll be well-prepared to ace the exam. Monitor your progress, focus on areas that need improvement, and study anytime, anywhere—even offline! Features: Extensive question bank covering all CDL test sections Realistic DMV-style practice exams Detailed explanations for better learning Progress tracking to help you stay on top Offline access for study on the go Download CDL Prep A+ today and start your journey toward becoming a professional driver! --- Auto-renewable subscriptions are available from the App Store for CDL Prep A+. • Payment will be charged to your iTunes account at confirmation of purchase and will automatically renew (at the duration/price selected) unless auto-renew is turned off at least 24 hrs before the end of the current period. • Account will be charged for renewal within 24-hours prior to the end of the current period • Current subscription may not be cancelled during the active subscription period; however, you can manage your subscription and/or turn off auto-renewal by visiting your iTunes Account Settings after purchase. Terms of Use: https://cdl.hubtests.com/terms Privacy Policy: https://cdl.hubtests.com/privacy

Screenshots

Building Atoms and Isotopes3 screens
CDL Prep A+4 screens

Verdict

The call

The clearest difference is price: CDL Prep A+ at Free against Building Atoms and Isotopes's $1.99. CDL Prep A+ also leads on update cadence (every 5 weeks vs every 18 months). Building Atoms and Isotopes's advantage is in-app purchases (none vs 2) and iOS requirement (13.0 vs 16.0). On 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

CDL Prep A+ is free to download; Building Atoms and Isotopes costs $1.99 up front. CDL Prep A+ sells 2 in-app purchases, starting at $8.99 per month. Building Atoms and Isotopes asks for nothing beyond the download.

UpkeepUpdate frequency

Building Atoms and Isotopes ships an update every 18 months, CDL Prep A+ every 5 weeks. The most recent releases landed on September 17, 2026 and September 19, 2026 respectively.

Scorecard4 real differences · 6 level
Building Atoms and Isotopes versus CDL Prep A+: the parameters behind the verdict, then further details
ParameterBuilding Atoms and IsotopesCDL Prep A+
Price$1.99Free — better
Rating3.5 (2 ratings) — better—
Positive reviews33.3% of reviews—
Number of ratings2 — better—
Update frequencyEvery 18 monthsEvery 5 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaid—
DevicesiPhone, iPod — betteriPhone
Requires iOS13.0 — better16.0
Further details — not scored
Size10 MB13 MB
Age rating4+4+
DeveloperCarolina Biological SupplyCargo Teleport Inc

In-app purchases

None

Building Atoms and Isotopes

No in-app purchases

2 purchases

CDL Prep A+

Subscriptions1
  • Premium monthly subscription$8.991 Month
One-time1
  • Lifetime version$14.99

Questions

Is Building Atoms and Isotopes free?
Building Atoms and Isotopes costs $1.99, with no in-app purchases.
Is CDL Prep A+ free?
CDL Prep A+ is free to download, with in-app purchases available.
Do Building Atoms and Isotopes or CDL Prep A+ have ads?
Neither Building Atoms and Isotopes nor CDL Prep A+ shows ads.
Which is updated more often, Building Atoms and Isotopes or CDL Prep A+?
Building Atoms and Isotopes ships an update every 18 months, and CDL Prep A+ every 5 weeks. Most recently, Building Atoms and Isotopes was updated on September 17, 2026 and CDL Prep A+ on September 19, 2026.

Other comparisons