# isuniYe OTC vs Tone Generator

The clearest difference is in-app purchases: isuniYe OTC at none against Tone Generator's 1. isuniYe OTC also leads on device support (3 vs 1) and iOS requirement (12.0 vs 18.5). Tone Generator's advantage is update cadence (every 5 months vs every 14 months). On price and ads there is nothing between them.

Both are free to download. Tone Generator sells 1 one-off in-app purchase. isuniYe OTC asks for nothing beyond the download.

isuniYe OTC ships an update every 14 months, Tone Generator every 5 months. The most recent releases landed on October 6, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | isuniYe OTC | Tone Generator |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 14 months | **Every 5 months** |
| Size | 35 MB | 10 MB |
| Requires iOS | **12.0** | 18.5 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [iSuniye LLC](https://appshunter.io/developer/1126690445) | [IVANA RAST](https://appshunter.io/developer/1782298960) |

## What reviewers say

### isuniYe OTC

[App page](https://appshunter.io/ios/app/isuniye-otc/id1457548524)

**Features:** macOS Compatibility

**In-app purchases:** none


### Tone Generator

[App page](https://appshunter.io/ios/app/tone-generator-harmoniq/id6744338213)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Frequency Generator Premium | $6.99 | one-time |


## Frequently asked questions

### Is isuniYe OTC free?

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

### Is Tone Generator free?

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

### Do isuniYe OTC or Tone Generator have ads?

Neither isuniYe OTC nor Tone Generator shows ads.

### Which is updated more often, isuniYe OTC or Tone Generator?

isuniYe OTC ships an update every 14 months, and Tone Generator every 5 months. Most recently, isuniYe OTC was updated on October 6, 2026 and Tone Generator on October 10, 2026.

---

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