# Kuna vs Dioptra

The clearest difference is in-app purchases: Kuna at none against Dioptra's 3. On price, update cadence, ads and device support there is nothing between them.

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

Both ship on a similar rhythm, roughly fortnightly. The most recent releases landed on October 24, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | Kuna | Dioptra |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/kuna/id6751142174/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | Fortnightly |
| Monetization | Free | — |
| Size | 30 MB | 5 MB |
| Requires iOS | 18.4 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [RICHARD JOHN ANNAND](https://appshunter.io/developer/1833659046) | [Zachary Griffin](https://appshunter.io/developer/1813803229) |

## What reviewers say

### Kuna

[App page](https://appshunter.io/ios/app/kuna/id6751142174)

This app helps you manage tasks and projects with features like priorities, due dates, and custom labels. It facilitates collaboration through comments and integrates with your calendar for seamless scheduling and reminders.

**Highlights:** Task organization with priorities and due dates, Customizable labels for workflow matching, Assignees, reminders, and scheduling, Dependency management, Team collaboration via comments, Calendar sync, Flexible display options

**Features:** macOS Compatibility

**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 Kuna free?

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

### Is Dioptra free?

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

### Do Kuna or Dioptra have ads?

Neither Kuna nor Dioptra shows ads.

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

Kuna ships an update fortnightly, and Dioptra fortnightly. Most recently, Kuna was updated on October 24, 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.*