# DREME Math Classroom Observer vs Liberty PS

The clearest difference is update cadence: Liberty PS at every 2 months against DREME Math Classroom Observer's every 4 months. 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.

DREME Math Classroom Observer ships an update every 4 months, Liberty PS every 2 months. The most recent releases landed on October 14, 2026 and September 28, 2026 respectively.

## The numbers

| Metric | DREME Math Classroom Observer | Liberty PS |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 months** |
| Size | 26 MB | 48 MB |
| Requires iOS | 14.0 | 14.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Kelley Durkin](https://appshunter.io/developer/1645908110) | [Liberty 53 School District](https://appshunter.io/developer/1420134084) |

## What reviewers say

### DREME Math Classroom Observer

[App page](https://appshunter.io/ios/app/dreme-math-classroom-observer/id6443436386)

**In-app purchases:** none


### Liberty PS

[App page](https://appshunter.io/ios/app/liberty-ps/id6747727462)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is DREME Math Classroom Observer free?

DREME Math Classroom Observer is free to download, with no in-app purchases.

### Is Liberty PS free?

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

### Do DREME Math Classroom Observer or Liberty PS have ads?

Neither DREME Math Classroom Observer nor Liberty PS shows ads.

### Which is updated more often, DREME Math Classroom Observer or Liberty PS?

DREME Math Classroom Observer ships an update every 4 months, and Liberty PS every 2 months. Most recently, DREME Math Classroom Observer was updated on October 14, 2026 and Liberty PS on September 28, 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.*