Decay Tree vs Atomizer AR
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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
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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.
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.
- 3D atomic and molecular orbital visualization
- Augmented reality integration
- Hartree-Fock computational method for MOs
- Sketch organic compounds
- Automatic SMILES and IUPAC nomenclature generation
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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
Verdict
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
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.
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.
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.
| Parameter | Decay Tree | Atomizer AR |
|---|---|---|
| Price | Free | Free |
| Rating | 4.1 (7 ratings) — better | 4.0 (3 ratings) |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 7 — better | 3 |
| Update frequency | Every 11 months | Every 4 weeks — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod, Mac — better |
| Requires iOS | 12.0 — better | 15.2 |
| Further details — not scored | ||
| Size | 53 MB | 132 MB |
| Age rating | 4+ | 4+ |
| Developer | Gustaf Holst | Wonmo Seong |
Customer experience
Decay Tree
Atomizer AR
In-app purchases
Decay Tree
- Radiation Table$0.99
- Remove Ads$1.99
Atomizer AR
- Californium Pass$1.991 Month
- Californium Pass$2.991 Month
- Einsteinium Pass$3.991 Year
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- Einsteinium Pass$6.991 Month
Questions
Is Decay Tree free?
Is Atomizer AR free?
Which has better reviews, Decay Tree or Atomizer AR?
Do Decay Tree or Atomizer AR have ads?
Which is updated more often, Decay Tree or Atomizer AR?
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