# Inventory For Makers vs Dioptra

The clearest difference is in-app purchases: Inventory For Makers 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. Inventory For Makers asks for nothing beyond the download.

Inventory For Makers ships an update every 10 days, Dioptra fortnightly. The most recent releases landed on October 28, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | Inventory For Makers | Dioptra |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 10 days** | Fortnightly |
| Size | 3 MB | 5 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Hernan Amiune](https://appshunter.io/developer/1663477968) | [Zachary Griffin](https://appshunter.io/developer/1813803229) |

## What reviewers say

### Inventory For Makers

[App page](https://appshunter.io/ios/app/inventory-for-makers/id6768944391)

**Features:** macOS Compatibility, Vision Pro 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 Inventory For Makers free?

Inventory For Makers is free to download, with no in-app purchases.

### Is Dioptra free?

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

### Do Inventory For Makers or Dioptra have ads?

Neither Inventory For Makers nor Dioptra shows ads.

### Which is updated more often, Inventory For Makers or Dioptra?

Inventory For Makers ships an update every 10 days, and Dioptra fortnightly. Most recently, Inventory For Makers was updated on October 28, 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.*