# Perseus vs OsteoPlan

The clearest difference is update cadence: OsteoPlan at fortnightly against Perseus's every 3 months. Perseus's advantage is iOS requirement (9.3 vs 17). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Perseus ships an update every 3 months, OsteoPlan fortnightly. The most recent releases landed on September 20, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | Perseus | OsteoPlan |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Fortnightly** |
| Size | 71 MB | 7 MB |
| Requires iOS | **9.3** | 17 |
| Devices | iPad | **iPhone, iPad** |
| Age rating | 17+ | 12+ |
| Developer | [Orthokey Italia s.r.l.](https://appshunter.io/developer/899950138) | [Aravind Ravichandran](https://appshunter.io/developer/1873728612) |

## What reviewers say

### Perseus

[App page](https://appshunter.io/ios/app/perseus/id899950135)

**Features:** macOS Compatibility

**In-app purchases:** none


### OsteoPlan

[App page](https://appshunter.io/ios/app/osteoplan/id6758571441)

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

**In-app purchases:** none


## Frequently asked questions

### Is Perseus free?

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

### Is OsteoPlan free?

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

### Do Perseus or OsteoPlan have ads?

Neither Perseus nor OsteoPlan shows ads.

### Which is updated more often, Perseus or OsteoPlan?

Perseus ships an update every 3 months, and OsteoPlan fortnightly. Most recently, Perseus was updated on September 20, 2026 and OsteoPlan on September 24, 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.*