# Centralia High School vs Pre

The clearest difference is in-app purchases: Centralia High School at none against Pre's 1. Pre's advantage is update cadence (monthly vs every 4 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Pre sells 1 one-off in-app purchase. Centralia High School asks for nothing beyond the download.

Centralia High School ships an update every 4 months, Pre monthly. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Centralia High School | Pre |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Monthly** |
| Size | 64 MB | 46 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Centralia High School](https://appshunter.io/developer/1584408869) | [Curriculum Technologies](https://appshunter.io/developer/1560552534) |

## What reviewers say

### Centralia High School

[App page](https://appshunter.io/ios/app/centralia-high-school/id1584408867)

**In-app purchases:** none


### Pre

[App page](https://appshunter.io/ios/app/pre-k-tests/id6787065346)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Access | $1.99 | one-time |


## Frequently asked questions

### Is Centralia High School free?

Centralia High School is free to download, with no in-app purchases.

### Is Pre free?

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

### Do Centralia High School or Pre have ads?

Neither Centralia High School nor Pre shows ads.

### Which is updated more often, Centralia High School or Pre?

Centralia High School ships an update every 4 months, and Pre monthly. Most recently, Centralia High School was updated on November 3, 2026 and Pre on October 31, 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.*