Comparison

Radioactivity Conversion vs Twilight Time

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

Head to head
About

Radioactivity Conversion

Easily convert between various units related to radioactive decay. Understand the process of emitting radioactive particles and the properties of elements exhibiting radioactivity.

Highlights
  • Radioactive decay unit conversion
  • Information on radioactive decay process
  • Details on radioactive particles
  • Explanation of half-life
  • Properties of radioactive elements
Features
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Radioactivity Conversion or Radioactive Decay Unit Conversion - Easily convert between various Radioactive units. Radioactive decay is the process of emitting radioactive particles, particularly ionizing radiation. Various types of radioactive decay include alpha, beta, and gamma decay, named after the particles emitted during this process. As decay occurs, radioactive particles carry energy away from the nucleus. In some cases, radioactive decay can transform the original nucleus into either a different nucleus or a nucleus in an altered state. Radioactivity is a property exhibited by certain elements, where the atomic nucleus spontaneously loses electromagnetic energy due to its inherent instability. This phenomenon was first discovered in 1896 by the French physicist Antoine-Henri Becquerel. During this process, ionizing particles and electromagnetic radiation are emitted from the nucleus. Many elements exhibit natural radioactivity. The duration for radiation to undergo decay varies between elements and their isotopes, often measured in terms of a half-life. The half-life signifies the time it takes for an element's radiation to decrease to half of its initial intensity. Certain elements like uranium and thorium continuously emit radiation and ionizing particles, leading to the formation of different daughter elements while releasing energy in the form of alpha, beta, and gamma radiation. One particularly significant radioactive element is Radon, a dense, colorless, and odorless gas with a boiling point of -61.8°C (-79.2°F). Radon readily dissolves in water below its boiling point and can freeze at low temperatures. Thanks for your support and do visit nitrio.com for more apps for your iOS devices.

About

Twilight Time

Features
Read full description

Shows the time before sunrise and after sunset when the sun is below the horizon and it is bright outside (twilight). Twilight 1. Civil twilight 2. Nautical twilight 3. Astronomical twilight

Screenshots

Radioactivity Conversion4 screens
Twilight Time1 screens

Verdict

The call

The clearest difference is price: Twilight Time at Free against Radioactivity Conversion's $2.99. Twilight Time also leads on update cadence (every 2 weeks vs every 28 months). Radioactivity Conversion's advantage is ads (none vs shown) and iOS requirement (13 vs 16.7.10). On 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

Twilight Time is free to download; Radioactivity Conversion costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Radioactivity Conversion ships an update every 28 months, Twilight Time every 2 weeks. The most recent releases landed on September 30, 2026 and September 23, 2026 respectively.

Scorecard4 real differences · 6 level
Radioactivity Conversion versus Twilight Time: the parameters behind the verdict, then further details
ParameterRadioactivity ConversionTwilight Time
Price$2.99Free — better
Rating3.0 (2 ratings) — better—
Positive reviews0.0% of reviews—
Number of ratings2 — better—
Update frequencyEvery 28 monthsEvery 2 weeks — better
AdsNo — betterYes
In-app purchasesNoNo
MonetizationPaid—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS13 — better16.7.10
Further details — not scored
Size1 MB36 MB
Age rating4+4+
DeveloperNitrioHideaki Uchikoshi

In-app purchases

None

Radioactivity Conversion

No in-app purchases

None

Twilight Time

No in-app purchases

Questions

Is Radioactivity Conversion free?
Radioactivity Conversion costs $2.99, with no in-app purchases.
Is Twilight Time free?
Twilight Time is free to download, with no in-app purchases.
Do Radioactivity Conversion or Twilight Time have ads?
Twilight Time shows ads; Radioactivity Conversion does not.
Which is updated more often, Radioactivity Conversion or Twilight Time?
Radioactivity Conversion ships an update every 28 months, and Twilight Time every 2 weeks. Most recently, Radioactivity Conversion was updated on September 30, 2026 and Twilight Time on September 23, 2026.

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