# Zero Chat vs Sphere

The clearest difference is update cadence: Zero Chat at every 4 days against Sphere's every 3 weeks. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Zero Chat sells 1 in-app purchase, starting at $8.99 per month and Sphere sells 2 in-app purchases, starting at $7.99 per month. Whichever you choose, the download price is not the number that matters.

Zero Chat ships an update every 4 days, Sphere every 3 weeks. The most recent releases landed on October 19, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Zero Chat | Sphere |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 3 weeks |
| Size | 72 MB | 57 MB |
| Requires iOS | 16.4 | 16.4 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 17+ |
| Developer | [Oleg Filimonov](https://appshunter.io/developer/1769783383) | [Rajesh Cherukuri](https://appshunter.io/developer/6781198482) |

## What reviewers say

### 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 |


### Sphere

[App page](https://appshunter.io/ios/app/sphere-multi-model-ai-chat/id6781198480)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $7.99 | per month |
| Premium Yearly | $54.99 | per year |


## Frequently asked questions

### Is Zero Chat free?

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

### Is Sphere free?

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

### Do Zero Chat or Sphere have ads?

Neither Zero Chat nor Sphere shows ads.

### Which is updated more often, Zero Chat or Sphere?

Zero Chat ships an update every 4 days, and Sphere every 3 weeks. Most recently, Zero Chat was updated on October 19, 2026 and Sphere on October 15, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*