# I vs 온돌

The clearest difference is in-app purchases: I at none against 온돌's 1. I also leads on iOS requirement (13 vs 15.0). 온돌's advantage is update cadence (every 5 days vs every 3 months). On price, ads and device support there is nothing between them.

Both are free to download. 온돌 sells 1 in-app purchase, starting at $17.99 per year. I asks for nothing beyond the download.

I ships an update every 3 months, 온돌 every 5 days. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | I | 온돌 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 5 days** |
| Size | 81 MB | 137 MB |
| Requires iOS | **13** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Gilon Inc.](https://appshunter.io/developer/1492224950) | [Hyun-Il Yoo](https://appshunter.io/developer/1683275732) |

## What reviewers say

### I

[App page](https://appshunter.io/ios/app/i-sol-care-i-sol/id1600595191)

**In-app purchases:** none


### 온돌

[App page](https://appshunter.io/ios/app/id6810575845)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 병원동행 뱃지 | $17.99 | per year |


## Frequently asked questions

### Is I free?

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

### Is 온돌 free?

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

### Do I or 온돌 have ads?

Neither I nor 온돌 shows ads.

### Which is updated more often, I or 온돌?

I ships an update every 3 months, and 온돌 every 5 days. Most recently, I was updated on November 3, 2026 and 온돌 on October 31, 2026.

---

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