# Physical Constants vs Physics Questions

The clearest difference is in-app purchases: Physical Constants at none against Physics Questions's 9. Physics Questions's advantage is update cadence (every 4 days vs every 9 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Physics Questions sells 9 one-off in-app purchases. Physical Constants asks for nothing beyond the download.

Physical Constants ships an update every 9 months, Physics Questions every 4 days. The most recent releases landed on October 14, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Physical Constants | Physics Questions |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.3 (3 ratings)](https://appshunter.io/ios/app/physical-constants-ml/id837679891/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 33.3% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 9 months | **Every 4 days** |
| Monetization | Ad-supported | — |
| Size | 25 MB | 20 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Takuya Ishikawa](https://appshunter.io/developer/468311118) | [Michael Todd](https://appshunter.io/developer/1211079532) |

## What reviewers say

### Physical Constants

[App page](https://appshunter.io/ios/app/physical-constants-ml/id837679891)

Access a comprehensive list of physical constants, organized by category for easy searching. This app supports all AppStore languages and allows users to report corrections via email.

**Highlights:** Physical constants database, Categorized by topic, Search functionality, Multi-language support, User feedback for corrections

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Physics Questions

[App page](https://appshunter.io/ios/app/physics-questions/id1616961005)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Electricity Questions | $1.99 | one-time |
| Electronics Questions | $1.99 | one-time |
| Electromagnetism Questions | $1.99 | one-time |
| Force & Energy Questions | $1.99 | one-time |
| Motion Questions | $1.99 | one-time |
| Optics Questions | $1.99 | one-time |
| Radioactivity & Thermodynamics | $1.99 | one-time |
| Special Relativity Questions | $1.99 | one-time |
| Waves & Particles Questions | $1.99 | one-time |


## Frequently asked questions

### Is Physical Constants free?

Physical Constants is free to download, with no in-app purchases.

### Is Physics Questions free?

Physics Questions is free to download, with in-app purchases available.

### Do Physical Constants or Physics Questions have ads?

Both Physical Constants and Physics Questions show ads.

### Which is updated more often, Physical Constants or Physics Questions?

Physical Constants ships an update every 9 months, and Physics Questions every 4 days. Most recently, Physical Constants was updated on October 14, 2026 and Physics Questions on October 6, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*