# Diffu vs Yearbound

The clearest difference is in-app purchases: Yearbound at none against Diffu's 6. Yearbound also leads on ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

Both are free to download. Diffu sells 6 in-app purchases, starting at $2.99 per month. Yearbound asks for nothing beyond the download.

Diffu ships an update every 2 weeks, Yearbound every 10 days. The most recent releases landed on September 8, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | Diffu | Yearbound |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 2 weeks | **Every 10 days** |
| Size | 73 MB | 17 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Jeong-Hwan Jang](https://appshunter.io/developer/1880755654) | [Yearbound Studio LLC](https://appshunter.io/developer/1885246208) |

## What reviewers say

### Diffu

[App page](https://appshunter.io/ios/app/diffu-something-to-say/id6759802088)

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Diffu Premium | $2.99 | per month |
| Diffu Premium | $29.99 | per year |
| 100 엠버 | $0.49 | one-time |
| 500 엠버 | $2.99 | one-time |
| 1000 엠버 | $6.99 | one-time |
| 3000 엠버 | $19.99 | one-time |


### Yearbound

[App page](https://appshunter.io/ios/app/yearbound/id6760601239)

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

**In-app purchases:** none


## Frequently asked questions

### Is Diffu free?

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

### Is Yearbound free?

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

### Do Diffu or Yearbound have ads?

Diffu shows ads; Yearbound does not.

### Which is updated more often, Diffu or Yearbound?

Diffu ships an update every 2 weeks, and Yearbound every 10 days. Most recently, Diffu was updated on September 8, 2026 and Yearbound on September 22, 2026.

---

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