# Decipher Physics vs orionphysics

The clearest difference is in-app purchases: Decipher Physics at none against orionphysics's 2. orionphysics's advantage is update cadence (fortnightly vs monthly). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. orionphysics sells 2 in-app purchases, starting at $9.99 per month. Decipher Physics asks for nothing beyond the download.

Decipher Physics ships an update monthly, orionphysics fortnightly. The most recent releases landed on September 18, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | Decipher Physics | orionphysics |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Fortnightly** |
| Size | 48 MB | 12 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Alexander Lione](https://appshunter.io/developer/1843340454) | [小建 潘](https://appshunter.io/developer/1533572114) |

## What reviewers say

### Decipher Physics

[App page](https://appshunter.io/ios/app/decipher-physics/id6754386558)

**Features:** macOS Compatibility

**In-app purchases:** none


### orionphysics

[App page](https://appshunter.io/ios/app/orionphysics/id6762356208)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Premium | $9.99 | per month |
| Yearly Premium | $59.99 | per year |


## Frequently asked questions

### Is Decipher Physics free?

Decipher Physics is free to download, with no in-app purchases.

### Is orionphysics free?

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

### Do Decipher Physics or orionphysics have ads?

Neither Decipher Physics nor orionphysics shows ads.

### Which is updated more often, Decipher Physics or orionphysics?

Decipher Physics ships an update monthly, and orionphysics fortnightly. Most recently, Decipher Physics was updated on September 18, 2026 and orionphysics on September 13, 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.*