# THETA（シィータ） vs QUON

The clearest difference is iOS requirement: THETA（シィータ） at 8.0 against QUON's 13.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

THETA（シィータ） ships an update every 42 months, QUON every 48 months. The most recent releases landed on October 25, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | THETA（シィータ） | QUON |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 42 months** | Every 48 months |
| Size | 3 MB | 3 MB |
| Requires iOS | **8.0** | 13.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Naoya Takahashi](https://appshunter.io/developer/1301211980) | [shingo kamei](https://appshunter.io/developer/1256845824) |

## What reviewers say

### THETA（シィータ）

[App page](https://appshunter.io/ios/app/theta/id1517988653)

**Features:** macOS Compatibility

**In-app purchases:** none


### QUON

[App page](https://appshunter.io/ios/app/quon/id1621991729)

**In-app purchases:** none


## Frequently asked questions

### Is THETA（シィータ） free?

THETA（シィータ） is free to download, with no in-app purchases.

### Is QUON free?

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

### Do THETA（シィータ） or QUON have ads?

Neither THETA（シィータ） nor QUON shows ads.

### Which is updated more often, THETA（シィータ） or QUON?

THETA（シィータ） ships an update every 42 months, and QUON every 48 months. Most recently, THETA（シィータ） was updated on October 25, 2026 and QUON on October 27, 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.*