# iSun vs Umi

The clearest difference is iOS requirement: Umi at 15.6 against iSun's 17.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. iSun sells 10 one-off in-app purchases and Umi sells 9 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

iSun ships an update every 6 days, Umi every 5 days. The most recent releases landed on October 27, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | iSun | Umi |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 6 days | **Every 5 days** |
| Size | 266 MB | 60 MB |
| Requires iOS | 17.0 | **15.6** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 9+ | 17+ |
| Developer | [成都二耶科技有限公司](https://appshunter.io/developer/1763409898) | [贵州柚米科技有限公司](https://appshunter.io/developer/1895140874) |

## What reviewers say

### iSun

[App page](https://appshunter.io/ios/app/isun/id6757897149)

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 6元购买 | $0.99 | one-time |
| 12元购买 | $1.99 | one-time |
| 18元购买 | $2.99 | one-time |
| 22元购买 | $2.99 | one-time |
| 30元购买 | $3.99 | one-time |
| 35元购买 | $4.99 | one-time |
| 38元购买 | $4.99 | one-time |
| 68元购买 | $9.99 | one-time |
| 98元购买 | $14.99 | one-time |
| 128元购买 | $19.99 | one-time |


### Umi

[App page](https://appshunter.io/ios/app/umi/id6763055704)

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

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| umi币充值 | $0.99 | one-time |
| umi币充值 | $1.99 | one-time |
| umi币充值 | $3.99 | one-time |
| umi币充值 | $6.99 | one-time |
| umi币充值 | $14.99 | one-time |
| umi币充值 | $24.99 | one-time |
| umi币充值 | $59.99 | one-time |
| umi币充值 | $79.99 | one-time |
| umi币充值 | $99.99 | one-time |


## Frequently asked questions

### Is iSun free?

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

### Is Umi free?

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

### Do iSun or Umi have ads?

Neither iSun nor Umi shows ads.

### Which is updated more often, iSun or Umi?

iSun ships an update every 6 days, and Umi every 5 days. Most recently, iSun was updated on October 27, 2026 and Umi on October 25, 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.*