# Pixdo vs SubSum

The clearest difference is in-app purchases: SubSum at none against Pixdo's 1. Pixdo's advantage is update cadence (every 3 weeks 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. Pixdo sells 1 one-off in-app purchase. SubSum asks for nothing beyond the download.

Pixdo ships an update every 3 weeks, SubSum every 4 months. The most recent releases landed on October 2, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Pixdo | SubSum |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 4 months |
| Size | 50 MB | 2 MB |
| Requires iOS | **13.0** | 17 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [WenFeng Jia](https://appshunter.io/developer/1460552306) | [桥 汪](https://appshunter.io/developer/1658027527) |

## What reviewers say

### Pixdo

[App page](https://appshunter.io/ios/app/pixdo/id1460552307)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 解锁完整版 | $2.99 | one-time |


### SubSum

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

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

**In-app purchases:** none


## Frequently asked questions

### Is Pixdo free?

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

### Is SubSum free?

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

### Do Pixdo or SubSum have ads?

Neither Pixdo nor SubSum shows ads.

### Which is updated more often, Pixdo or SubSum?

Pixdo ships an update every 3 weeks, and SubSum every 4 months. Most recently, Pixdo was updated on October 2, 2026 and SubSum on October 12, 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.*