Comparison

Radioactivity vs K

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

Head to head
About

Radioactivity

Features
Read full description

Radioactivity K12 Learning app helps us to know about Radioactive Decay, Nuclear Fission and Fusion. Our app makes it easy for kids and students to understand the uses and safety measures of Radioactivity. Our objective is to make this science concept simple to understand for students and get in-depth knowledge of the subject. There are three sections in the app: Each section is targeted to develop the student’s skills. Radioactivity app is designed to provide extra help for each and every physics student. Radiation & Radioactivity: This section explains the complete definition of Radiation, Radioactivity and Radioisotopes. *Radioactive Decay - There are three types of Radioactive Decay - namely Alpha Decay, Beta Decay and Gamma Decay based on the respective radiations Alpha, Beta and Gamma radiations. *Nuclear Fission - A large nucleus splits to form two smaller nuclei and some neutrons.This section explains two kinds of Nuclear Fission namely spontaneous fission and Neutron-induced fission. *Nuclear Fusion - Two small nuclei come together and join to form a large nucleus, releasing energy. 2) Uses & Safe Handling: This section explains about Uses & Safe Handling of Radioactive elements. Radioactivity is used for various functionalities in industries and medicine like Smoke detector, Thickness measurement, Leak detection. 3) Quiz: An interactive quiz to check the knowledge with score board. Download the Radioactivity app and other K12 educational apps published by Ajax Media Tech and make your kids shine in science.

About

K

Create and visualize 2D and 3D molecular models with intuitive drawing tools and AR capabilities. This app serves as a practical and cost-effective alternative to physical model kits for students.

Highlights
  • 2D structural formula drawing
  • 3D molecular model visualization
  • Augmented Reality (AR) viewing
  • Save and reopen models
  • Pre-built templates
  • Screenshot capture
Features
Read full description

**The Molecular Model App We Always Wanted** Born from the developer’s own learning experience, K-Mol is a molecular modeling app designed for high school and university students. ## Features ### 2D Mode ・Draw structural formulas with intuitive controls ・Supports up bonds and down bonds, making it possible to represent stereochemical structures ・Includes templates for five-membered and six-membered sugar rings, saving you from the tedious process of drawing them from scratch ### 3D Mode ・A 3D mode that feels like using a real molecular model kit ・A practical alternative to physical molecular model kits, which can be surprisingly expensive ・Recreates bond lengths and bond angles, making it useful for learning from the high school level through university-level chemistry ・viewing molecular models in AR ## Shared Features ・Screenshot: Capture the structural formulas and 3D models you create. Perfect for reports and study materials. ・Save: Save your structural formulas and 3D models inside the app and reopen them anytime. ・Templates: Frequently used structural formulas are available as templates, so you do not have to draw everything manually. ## Important Notes K-Mol is an educational app designed to help students learn about molecular structures, bonds, stereochemistry, and basic chemical visualization. It is not a substitute for textbooks, classroom instruction, laboratory safety guidance, or professional chemical analysis. The molecular structures, bond lengths, bond angles, aromatic representations, templates, and 2D/3D views shown in the app are simplified models for educational purposes. They do not fully represent actual chemical behavior, quantum effects, force-field optimization, experimentally measured structures, or other advanced chemical properties. Do not use this app for laboratory safety, medical, pharmaceutical, environmental, industrial, regulatory, research-level modeling, synthesis planning, handling of hazardous substances, or any other professional or safety-critical purpose. This app does not provide professional advice. The information displayed is intended for general educational purposes only.

Screenshots

K2 screens

Verdict

The call

The clearest difference is update cadence: K at every 2 weeks against Radioactivity's every 36 months. Radioactivity's advantage is iOS requirement (12.0 vs 17.0). On price, ads, in-app purchases 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

Radioactivity costs $0.99 and K $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Radioactivity ships an update every 36 months, K every 2 weeks. The most recent releases landed on September 16, 2026 and September 21, 2026 respectively.

Scorecard2 real differences · 6 level
Radioactivity versus K: the parameters behind the verdict, then further details
ParameterRadioactivityK
Price$0.99$0.99
Positive reviews—0.0% of reviews
Update frequencyEvery 36 monthsEvery 2 weeks — better
AdsNoNo
In-app purchasesNoNo
Monetization—Paid
DevicesiPadiPhone, iPad — better
Requires iOS12.0 — better17.0
Further details — not scored
Size52 MB4 MB
Age rating4+4+
Developerwww.ajaxmediatech.comMasaki Kobayashi

In-app purchases

None

Radioactivity

No in-app purchases

None

K

No in-app purchases

Questions

Is Radioactivity free?
Radioactivity costs $0.99, with no in-app purchases.
Is K free?
K costs $0.99, with no in-app purchases.
Do Radioactivity or K have ads?
Neither Radioactivity nor K shows ads.
Which is updated more often, Radioactivity or K?
Radioactivity ships an update every 36 months, and K every 2 weeks. Most recently, Radioactivity was updated on September 16, 2026 and K on September 21, 2026.

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