# Neptune Odyssey vs Zero Chat

The clearest difference is update cadence: Zero Chat at every 4 days against Neptune Odyssey's every 2 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neptune Odyssey sells 6 in-app purchases, starting at $19.99 per month and Zero Chat sells 1 in-app purchase, starting at $8.99 per month. Whichever you choose, the download price is not the number that matters.

Neptune Odyssey ships an update every 2 months, Zero Chat every 4 days. The most recent releases landed on October 12, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | Neptune Odyssey | Zero Chat |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 4 days** |
| Size | 49 MB | 72 MB |
| Requires iOS | **15.1** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Neptune AI LLC](https://appshunter.io/developer/1871364974) | [Oleg Filimonov](https://appshunter.io/developer/1769783383) |

## What reviewers say

### Neptune Odyssey

[App page](https://appshunter.io/ios/app/neptune-odyssey/id6758185758)

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Pro access | $19.99 | per month |
| Monthly Pro+ access | $49.99 | per month |
| Monthly Pro max access | $99.99 | per month |
| Annual Pro access | $191.99 | per year |
| Annual Pro+ access | $479.99 | per year |
| Annual Pro max access | $949.99 | per year |


### Zero Chat

[App page](https://appshunter.io/ios/app/zero-chat-models/id6774957019)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $8.99 | per month |


## Frequently asked questions

### Is Neptune Odyssey free?

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

### Is Zero Chat free?

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

### Do Neptune Odyssey or Zero Chat have ads?

Neither Neptune Odyssey nor Zero Chat shows ads.

### Which is updated more often, Neptune Odyssey or Zero Chat?

Neptune Odyssey ships an update every 2 months, and Zero Chat every 4 days. Most recently, Neptune Odyssey was updated on October 12, 2026 and Zero Chat on October 19, 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.*