# Caply vs Dioptra

The clearest difference is price: Dioptra at Free against Caply's $4.99. Dioptra also leads on iOS requirement (17.0 vs 26.2). Caply's advantage is in-app purchases (none vs 3). On update cadence, ads and device support there is nothing between them.

Dioptra is free to download; Caply costs $4.99 up front. Dioptra sells 3 one-off in-app purchases. Caply asks for nothing beyond the download.

Caply ships an update every 3 weeks, Dioptra fortnightly. The most recent releases landed on October 25, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | Caply | Dioptra |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Fortnightly** |
| Size | 4 MB | 5 MB |
| Requires iOS | 26.2 | **17.0** |
| Devices | **iPhone, iPad, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Marc Idelberger](https://appshunter.io/developer/1803581255) | [Zachary Griffin](https://appshunter.io/developer/1813803229) |

## What reviewers say

### Caply

[App page](https://appshunter.io/ios/app/caply/id6759075909)

**In-app purchases:** none


### Dioptra

[App page](https://appshunter.io/ios/app/dioptra-glb-3d-model-viewer/id6812574588)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Small Tip | $0.99 | one-time |
| Tip | $1.99 | one-time |
| Generous Tip | $4.99 | one-time |


## Frequently asked questions

### Is Caply free?

Caply costs $4.99, with no in-app purchases.

### Is Dioptra free?

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

### Do Caply or Dioptra have ads?

Neither Caply nor Dioptra shows ads.

### Which is updated more often, Caply or Dioptra?

Caply ships an update every 3 weeks, and Dioptra fortnightly. Most recently, Caply was updated on October 25, 2026 and Dioptra on November 10, 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.*