Comparison

Photronium vs BitSpinner

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

Head to head
About

Photronium

Access over 360 physics equations with clear explanations and powerful search tools. Test your knowledge with custom quizzes and learn offline anywhere, anytime. This educational reference is designed for learners of all levels.

Highlights
  • 360+ physics equations
  • Offline access
  • Intelligent Search
  • Symbol Search
  • Customizable quizzes
  • Bookmarking
Read full description

With over 360 physics equations explained in a clear, easy-to-understand way and a flexible search system, Photronium can be an immensely helpful tool for learners of any level. PHYSICS AT YOUR FINGERTIPS Look up any physics equation, with topics including: • Motion in One Dimension • Projectile Motion • Laws of Motion • Uniform Circular Motion • Work and Energy • Linear Momentum and Collisions • Rotation of Rigid Bodies • Universal Gravitation • Fluid Mechanics • Oscillatory Motion • Wave Motion • Sound Waves • Thermodynamics • Electromagnetism • Light and Optics • Relativity • Quantum Physics All available offline, so you can learn anywhere, anytime. MEMORY QUIZ Test your knowledge by taking quizzes! Bookmark any section that interests you, and Photronium will automatically create quizzes based on those bookmarks. INTELLIGENT SEARCH & SYMBOL SEARCH Just type anything. Intelligent Search can work with the most ambiguous descriptions, like “atom”, “lens”, “radiation”, “Newton”, and “phase angle”. And when you need to find a physics formula without any description, Symbol Search provides a discovery experience you’ve never seen before. FREE & NO ADS Photronium comes with over 360 physics equations, Intelligent Search, Symbol Search, Widgets, Bookmarks, Suggested Websites, and Dark Mode all available for free and ad-free. With Extras, you can purchase more features and support the app’s development. Have questions or feedback? From the app, open Extras and send a report.

About

BitSpinner

Features
Read full description

Spinner makes quantum intuition visual, interactive, and fun. Explore a live Bloch sphere, drag to rotate and pan, and apply quantum gates instantly to see how a qubit evolves in real time. Spinner shows both geometric motion and state notation side by side, so you can connect what you see to what the math means. Built for iPhone and iPad, Spinner combines a clean control surface with a moody, immersive 3D scene to help you learn, teach, and experiment. Real-time Bloch sphere interaction Instant gate application (X, Y, Z, H, S, T, and more) Live α/β state readouts in multiple forms Smooth camera controls and polished visual modes Great for students and educators

Screenshots

Photronium4 screens
BitSpinner3 screens

Verdict

The call

The clearest difference is in-app purchases: BitSpinner at none against Photronium's 1. Photronium's advantage is update cadence (monthly vs every 4 months) and iOS requirement (16.4 vs 26.0). On price, 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. Photronium sells 1 one-off in-app purchase. BitSpinner asks for nothing beyond the download.

UpkeepUpdate frequency

Photronium ships an update monthly, BitSpinner every 4 months. The most recent releases landed on October 6, 2026 and October 14, 2026 respectively.

Scorecard3 real differences · 7 level
Photronium versus BitSpinner: the parameters behind the verdict, then further details
ParameterPhotroniumBitSpinner
PriceFreeFree
Rating5.0 (8 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings8 — better—
Update frequencyMonthly — betterEvery 4 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPadiPhone, iPad
Requires iOS16.4 — better26.0
Further details — not scored
Size59 MB8 MB
Age rating4+4+
DeveloperHao NguyenRobert Lis

In-app purchases

1 purchases

Photronium

One-time1
  • Multicolored Bookmarks$0.99
None

BitSpinner

No in-app purchases

Questions

Is Photronium free?
Photronium is free to download, with in-app purchases available.
Is BitSpinner free?
BitSpinner is free to download, with no in-app purchases.
Do Photronium or BitSpinner have ads?
Neither Photronium nor BitSpinner shows ads.
Which is updated more often, Photronium or BitSpinner?
Photronium ships an update monthly, and BitSpinner every 4 months. Most recently, Photronium was updated on October 6, 2026 and BitSpinner on October 14, 2026.

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