Comparison

Radioactive Decay Simulator vs Radioactivity

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

Head to head
About

Radioactive Decay Simulator

This educational tool simulates radioactive decay for a group of atoms. Users can choose preset atoms or input custom half-lives to observe decay in real-time graphs. The simulator allows for adjustments in atom count and speed for efficient analysis.

Highlights
  • Emulates radioactive decay
  • Select preset or custom atoms
  • Adjust atom count
  • Real-time decay graphs
  • Adjustable simulation speed
Features
Read full description

The Radioactive Decay Simulator emulates the radioactive decay of a group of like atoms. Users are able to select from a range of preset atoms, or enter the half-life of a specific atom that they wish to simulate. By adjusting the number of atoms, users are able to determine how even with a large number of atoms, the randomness of radioactive decay can be modeled. Users are able to observe the both number of decayed atoms as well as the number of non-decayed atoms remaining in a real time graph. The simulator can be sped up to allow atoms with a longer half-life to be analyzed quickly.

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.

Screenshots

Radioactive Decay Simulator1 screens

Verdict

The call

The clearest difference is price: Radioactive Decay Simulator at Free against Radioactivity's $0.99. Radioactive Decay Simulator also leads on update cadence (every 17 months vs every 36 months) and device support (3 vs 1). On ads and in-app purchases 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

Radioactive Decay Simulator is free to download; Radioactivity costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Radioactive Decay Simulator ships an update every 17 months, Radioactivity every 36 months. The most recent releases landed on June 5, 2026 and September 16, 2026 respectively.

Scorecard4 real differences · 6 level
Radioactive Decay Simulator versus Radioactivity: the parameters behind the verdict, then further details
ParameterRadioactive Decay SimulatorRadioactivity
PriceFree — better$0.99
Rating4.0 (1 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings1 — better—
Update frequencyEvery 17 months — betterEvery 36 months
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPad, iPod — betteriPad
Requires iOS9.3 — better12.0
Further details — not scored
Size20 MB52 MB
Age rating4+4+
DeveloperAlistair Shawwww.ajaxmediatech.com

In-app purchases

None

Radioactive Decay Simulator

No in-app purchases

None

Radioactivity

No in-app purchases

Questions

Is Radioactive Decay Simulator free?
Radioactive Decay Simulator is free to download, with no in-app purchases.
Is Radioactivity free?
Radioactivity costs $0.99, with no in-app purchases.
Do Radioactive Decay Simulator or Radioactivity have ads?
Neither Radioactive Decay Simulator nor Radioactivity shows ads.
Which is updated more often, Radioactive Decay Simulator or Radioactivity?
Radioactive Decay Simulator ships an update every 17 months, and Radioactivity every 36 months. Most recently, Radioactive Decay Simulator was updated on June 5, 2026 and Radioactivity on September 16, 2026.

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