Comparison

Decay calc vs AutoZHEN

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

Head to head
About

Decay calc

This tool calculates the decay of radioactive isotopes over time, considering half-life for accurate activity predictions. It's useful in nuclear medicine, environmental monitoring, and radiation safety for handling and disposal of materials.

Highlights
  • Radioactive isotope decay calculation
  • Half-life integration
  • Activity prediction
  • Decay constant determination
  • Radiation dose calculation
Features
Read full description

Decay calc is a tool used to calculate the decay of radioactive isotopes over time. It takes into account the half-life of the isotope and allows for accurate predictions of the remaining activity of the isotope at any given time. Decay calc can be used in a variety of fields, such as nuclear medicine, environmental monitoring, and radiation safety. It can help determine the appropriate handling and disposal of radioactive materials and ensure the safety of individuals who may come into contact with them. In addition to calculating the remaining activity of the isotope, decay calc can also be used to determine the decay constant, which is a measure of the rate at which the isotope decays. This information can be used to calculate the radiation dose received by individuals who are exposed to the isotope. Overall, decay calc is a useful tool for anyone working with radioactive materials or interested in learning more about radioactivity and its effects. It provides accurate and reliable calculations that can help ensure safety and proper handling of radioactive materials.

About

AutoZHEN

Features
Read full description

Dedicated to the overseas service of Chinese vehicles, we aim to build a genuine, transparent, and reliable ecosystem for export-ready vehicle resources. Specializing in creating a shared platform for real-time stock available for B2B transactions abroad.

Screenshots

Decay calc3 screens
AutoZHEN4 screens

Verdict

The call

The clearest difference is in-app purchases: AutoZHEN at none against Decay calc's 1. AutoZHEN also leads on iOS requirement (13.0 vs 15.2). On price, update cadence, 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

Both are free to download. Decay calc sells 1 one-off in-app purchase. AutoZHEN asks for nothing beyond the download.

UpkeepUpdate frequency

Decay calc ships an update every 3 months, AutoZHEN every 2 months. The most recent releases landed on October 8, 2026 and October 25, 2026 respectively.

Scorecard2 real differences · 8 level
Decay calc versus AutoZHEN: the parameters behind the verdict, then further details
ParameterDecay calcAutoZHEN
PriceFreeFree
Rating1.0 (1 ratings) — better—
Positive reviews50.0% of reviews—
Number of ratings1 — better—
Update frequencyEvery 3 monthsEvery 2 months — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.213.0 — better
Further details — not scored
Size27 MB28 MB
Age rating17+17+
DeveloperAlexey Baranov深圳市易车合创科技有限公司

In-app purchases

1 purchases

Decay calc

One-time1
  • Radio calc$0.99
None

AutoZHEN

No in-app purchases

Questions

Is Decay calc free?
Decay calc is free to download, with in-app purchases available.
Is AutoZHEN free?
AutoZHEN is free to download, with no in-app purchases.
Do Decay calc or AutoZHEN have ads?
Neither Decay calc nor AutoZHEN shows ads.
Which is updated more often, Decay calc or AutoZHEN?
Decay calc ships an update every 3 months, and AutoZHEN every 2 months. Most recently, Decay calc was updated on October 8, 2026 and AutoZHEN on October 25, 2026.

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