Comparison

Decay Tree vs Atomizer AR

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

Head to head
About

Decay Tree

This educational app visually represents nuclear decay chains for various nuclides. It graphically displays decay modes and half-lives, alongside detailed tables and graphs of spin, specific activity, and emitted particles.

Highlights
  • Visualizes decay chains
  • Graphical display of decay modes
  • Graphical display of half-lives
  • Tabulated details of spin, specific activity, emitted particles
  • Graphs of spin, specific activity, emitted particles
Features
Read full description

Decay Tree visualizes the whole decay chain for almost any known nuclide. Decay modes and half-lives are graphically shown. In addition, details like spin, specific activity, and emitted particles are tabulated and graphed.

About

Atomizer AR

Explore the quantum world with interactive 3D models of atoms and molecules in augmented reality. Visualize atomic and molecular orbitals, and sketch organic compounds to instantly generate their nomenclature.

Highlights
  • 3D atomic and molecular orbital visualization
  • Augmented reality integration
  • Hartree-Fock computational method for MOs
  • Sketch organic compounds
  • Automatic SMILES and IUPAC nomenclature generation
Features
Read full description

Atomizer AR turns your iPhone or iPad into a portable quantum chemistry lab. Visualize atomic and molecular orbitals in 3D, render electron density clouds, and step into immersive WebXR augmented reality where molecules sit on your desk at real-world scale. — WHAT YOU CAN DO — • Explore atomic orbitals computed from real hydrogenic wavefunctions: 1s, 2p, 3d, 4f and beyond, with adjustable shell glow and Bohmian trajectory animation. • View any molecule's molecular orbitals (HOMO, LUMO, intermediates) computed via PySCF on the cloud, then rendered as interactive isosurfaces. • See ball-and-stick models in WebXR augmented reality. Tap "View in AR", point at a flat surface, place the molecule on a table, then pinch to scale and drag to rotate. • Pair your phone with the desktop using Atomizer Remote: enter a 4-letter code, then tilt your phone to control the on-screen molecule with your gyroscope. Live preview streams back to your phone in real time. • Browse 40+ molecules — water, glucose, caffeine, benzene, ammonia, ethanol, methane, sulfuric acid and more — with energy diagrams, dipole arrows, lone pairs (VSEPR) and MO correlation diagrams. • Calculate molar mass live from any chemical formula, including parenthesised groups like Ca(OH)₂ and (NH₄)₂SO₄, with per-element breakdown. • Balance equations, run stoichiometry, sketch molecules in 2D, and explore reaction pathways. — SUBSCRIPTIONS — Free: 5 molecule renders per period. All calculator tools and full periodic table. Californium Pass — $2.99/month. 50 renders monthly, priority compute queue. Einsteinium Pass — $6.99/month. Unlimited renders, GLTF export for AR/3D printing, protein visualization, priority support. Auto-renews unless cancelled at least 24 hours before the period ends. Cancel anytime in Settings → Apple ID → Subscriptions. Subscriptions sync across iPhone, iPad, and electronvisual.org. Privacy: https://electronvisual.org/privacy Terms: https://electronvisual.org/terms

Screenshots

Decay Tree4 screens
Atomizer AR4 screens

Verdict

The call

The clearest difference is ads: Atomizer AR at none against Decay Tree's shown. Atomizer AR also leads on update cadence (every 4 weeks vs every 11 months). Decay Tree's advantage is iOS requirement (12.0 vs 15.2). On price, rating, review sentiment and ratings volume 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 Tree sells 2 one-off in-app purchases and Atomizer AR sells 4 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.1 for Decay Tree against 4.0 for Atomizer AR. Both are backed by a comparable volume of ratings — 7 and 3 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

UpkeepUpdate frequency

Decay Tree ships an update every 11 months, Atomizer AR every 4 weeks. The most recent releases landed on October 13, 2026 and October 15, 2026 respectively.

Scorecard3 real differences · 7 level
Decay Tree versus Atomizer AR: the parameters behind the verdict, then further details
ParameterDecay TreeAtomizer AR
PriceFreeFree
Rating4.1 (7 ratings) — better4.0 (3 ratings)
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings7 — better3
Update frequencyEvery 11 monthsEvery 4 weeks — better
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod, Mac — better
Requires iOS12.0 — better15.2
Further details — not scored
Size53 MB132 MB
Age rating4+4+
DeveloperGustaf HolstWonmo Seong

Customer experience

Decay Tree

All ratings7 ratings
Positive85.7%
Neutral0.0%
Negative14.3%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Atomizer AR

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews3 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

2 purchases

Decay Tree

One-time2
  • Radiation Table$0.99
  • Remove Ads$1.99
4 purchases

Atomizer AR

Subscriptions4
  • Californium Pass$1.991 Month
  • Californium Pass$2.991 Month
  • Einsteinium Pass$3.991 Year
Show 1 more
  • Einsteinium Pass$6.991 Month

Questions

Is Decay Tree free?
Decay Tree is free to download, with in-app purchases available.
Is Atomizer AR free?
Atomizer AR is free to download, with in-app purchases available.
Which has better reviews, Decay Tree or Atomizer AR?
Decay Tree is rated higher. Decay Tree averages 4.1 out of 5 from 7 ratings, while Atomizer AR averages 4.0 from 3 ratings.
Do Decay Tree or Atomizer AR have ads?
Decay Tree shows ads; Atomizer AR does not.
Which is updated more often, Decay Tree or Atomizer AR?
Decay Tree ships an update every 11 months, and Atomizer AR every 4 weeks. Most recently, Decay Tree was updated on October 13, 2026 and Atomizer AR on October 15, 2026.

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