Half vs DecayMate
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Half
This educational game simulates the process of producing nuclear medicines and industrial isotopes. Players manage a reactor to create essential materials for hospitals and research, learning about their societal benefits and decay rates.
- Teaches nuclear medicine and isotopes
- Simulates isotope production process
- Supports science education
- Features six common isotopes
- Mobile and web app
- Sound on/off option
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Half Life Hero is a fun educational app that teaches about nuclear medicines and industrial isotopes and their benefits to society. Teachers and students will find this app useful in supporting science education in the classroom and practising on the go. This game puts the player in control of ANSTO’s radio-isotope production process. Orders are received from hospitals, medical research laboratories or industry, and the player fills them by using ANSTO’s reactor to create materials such as Iodine, Molybdenum, Lutetium, etc. To fill these orders, the player must submerge raw materials in the nuclear reactor pool where they are exposed to neutrons. Once the materials are removed from the pool their decay begins at a speed that is related to their half-lives. Under the pressure of time, the player must process materials through two stages before they are shipped throughout Australia and overseas. Features * Suitable for beginners to intermediate learners of all ages * Features six isotopes created in nuclear reactors including Iodine-131, Molybdenum-99, Iridium-192, Cobalt-60, Lutetium -177 and Silicon-31. * Mobile and web app * Sound on/off to suit classroom or personal use
DecayMate
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Forget manual formulas and spreadsheet errors—get precise radioactive activity calculations instantly. DecayMate is a dedicated physics utility designed for laboratory reference and research. It streamlines the complex mathematics of radioactive decay, allowing you to focus on your inventory and calculations without the guesswork. KEY FEATURES: • Decay Calculator: Perform forward-decay calculations instantly. Input a starting activity and calculate exactly what remains after minutes, hours, or days based on standard exponential decay laws. • Target Activity Planner: Need a specific activity level at a future time? Use the backward-calculation tool to determine exactly the initial activity required to reach your target based on the isotope's half-life. • Live Tracker: Pin an active source and monitor its decay in real-time. Watch the activity decrease second-by-second on the live dashboard or via Home Screen widgets. • Custom Library: Comes pre-loaded with standard isotopes (Tc-99m, F-18, I-131, Cs-137, etc.). Need a specific radionuclide? Create and save custom isotopes with your own precise half-life definitions. • Unit Converter: Seamlessly toggle calculations between Curies (mCi, Ci) and Becquerels (MBq, GBq) anywhere in the application. • Privacy First: DecayMate operates entirely offline. Your custom isotope data and calculations are processed locally on your device and are never transmitted to the cloud.
Screenshots
Verdict
The clearest difference is update cadence: DecayMate at every 5 weeks against Half's every 11 months. Half's advantage is device support (3 vs 1) and iOS requirement (6.0 vs 26.0). On price, 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Half ships an update every 11 months, DecayMate every 5 weeks. The most recent releases landed on November 1, 2026 and November 9, 2026 respectively.
| Parameter | Half | DecayMate |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (2 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 2 — better | — |
| Update frequency | Every 11 months | Every 5 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 6.0 — better | 26.0 |
| Further details — not scored | ||
| Size | 59 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Australian Nuclear Science and Technology Organisation | Ludovico Pestarino |
In-app purchases
Half
No in-app purchases
DecayMate
No in-app purchases









