# SubSum vs Uni Studio

The clearest difference is in-app purchases: SubSum at none against Uni Studio's 3. Uni Studio's advantage is update cadence (every 3 days vs every 4 months) and iOS requirement (13.0 vs 17). On price, ads and device support there is nothing between them.

Both are free to download. Uni Studio sells 3 one-off in-app purchases. SubSum asks for nothing beyond the download.

SubSum ships an update every 4 months, Uni Studio every 3 days. The most recent releases landed on September 9, 2026 and September 7, 2026 respectively.

## The numbers

| Metric | SubSum | Uni Studio |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 days** |
| Size | 2 MB | 31 MB |
| Requires iOS | 17 | **13.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [桥 汪](https://appshunter.io/developer/1658027527) | [北京站狐科技有限公司](https://appshunter.io/developer/1858222100) |

## What reviewers say

### SubSum

[App page](https://appshunter.io/ios/app/subsum/id6754885566)

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

**In-app purchases:** none


### Uni Studio

[App page](https://appshunter.io/ios/app/uni-studio/id6756061730)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 50万 额度 | $0.99 | one-time |
| 120万 额度 | $2.99 | one-time |
| 300万 额度 | $4.99 | one-time |


## Frequently asked questions

### Is SubSum free?

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

### Is Uni Studio free?

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

### Do SubSum or Uni Studio have ads?

Neither SubSum nor Uni Studio shows ads.

### Which is updated more often, SubSum or Uni Studio?

SubSum ships an update every 4 months, and Uni Studio every 3 days. Most recently, SubSum was updated on September 9, 2026 and Uni Studio on September 7, 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.*