# Physical Constants vs ODE

The clearest difference is price: Physical Constants at Free against ODE's $1.99. Physical Constants also leads on iOS requirement (12.0 vs 15.1). ODE's advantage is ads (none vs shown) and update cadence (monthly vs every 9 months). On in-app purchases and device support there is nothing between them.

Physical Constants is free to download; ODE costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Physical Constants ships an update every 9 months, ODE monthly. The most recent releases landed on October 14, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Physical Constants | ODE |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| 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 | No |
| Ads | Yes | **No** |
| Update frequency | Every 9 months | **Monthly** |
| Monetization | Ad-supported | — |
| Size | 25 MB | 37 MB |
| Requires iOS | **12.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Takuya Ishikawa](https://appshunter.io/developer/468311118) | [Om Prakash Chapagain](https://appshunter.io/developer/1618620262) |

## 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


### ODE

[App page](https://appshunter.io/ios/app/ode-solver-integrator-pro/id1619296409)

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

**In-app purchases:** none


## Frequently asked questions

### Is Physical Constants free?

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

### Is ODE free?

ODE costs $1.99, with no in-app purchases.

### Do Physical Constants or ODE have ads?

Physical Constants shows ads; ODE does not.

### Which is updated more often, Physical Constants or ODE?

Physical Constants ships an update every 9 months, and ODE monthly. Most recently, Physical Constants was updated on October 14, 2026 and ODE on October 11, 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.*