# Saigon School Bus vs PSO

The clearest difference is update cadence: PSO at every 2 weeks against Saigon School Bus's monthly. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Saigon School Bus ships an update monthly, PSO every 2 weeks. The most recent releases landed on October 13, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Saigon School Bus | PSO |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Every 2 weeks** |
| Size | 60 MB | 81 MB |
| Requires iOS | 13.0 | **12** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Khang Bui](https://appshunter.io/developer/1573573375) | [Beowulf Network Inc](https://appshunter.io/developer/1590801990) |

## What reviewers say

### Saigon School Bus

[App page](https://appshunter.io/ios/app/saigon-school-bus/id6443772201)

**Features:** macOS Compatibility

**In-app purchases:** none


### PSO

[App page](https://appshunter.io/ios/app/pso/id6469098136)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Saigon School Bus free?

Saigon School Bus is free to download, with no in-app purchases.

### Is PSO free?

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

### Do Saigon School Bus or PSO have ads?

Neither Saigon School Bus nor PSO shows ads.

### Which is updated more often, Saigon School Bus or PSO?

Saigon School Bus ships an update monthly, and PSO every 2 weeks. Most recently, Saigon School Bus was updated on October 13, 2026 and PSO on October 6, 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.*