# Dingly vs Dioptra

The clearest difference is in-app purchases: Dingly at none against Dioptra's 3. Dingly also leads on update cadence (every 5 days vs fortnightly). Dioptra's advantage is iOS requirement (17.0 vs 26.0). On price, ads and device support there is nothing between them.

Both are free to download. Dioptra sells 3 one-off in-app purchases. Dingly asks for nothing beyond the download.

Dingly ships an update every 5 days, Dioptra fortnightly. The most recent releases landed on October 31, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | Dingly | Dioptra |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 5 days** | Fortnightly |
| Size | 13 MB | 5 MB |
| Requires iOS | 26.0 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Jiro Feingold](https://appshunter.io/developer/378715347) | [Zachary Griffin](https://appshunter.io/developer/1813803229) |

## What reviewers say

### Dingly

[App page](https://appshunter.io/ios/app/dingly/id6761277834)

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

**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 Dingly free?

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

### Is Dioptra free?

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

### Do Dingly or Dioptra have ads?

Neither Dingly nor Dioptra shows ads.

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

Dingly ships an update every 5 days, and Dioptra fortnightly. Most recently, Dingly was updated on October 31, 2026 and Dioptra on October 26, 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.*