# EarthProject vs Memstar Book

The clearest difference is update cadence: EarthProject at every 3 weeks against Memstar Book's every 3 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.

EarthProject ships an update every 3 weeks, Memstar Book every 3 months. The most recent releases landed on June 1, 2026 and December 3, 2025 respectively.

## The numbers

| Metric | EarthProject | Memstar Book |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (4 ratings)](https://appshunter.io/ios/app/earthproject/id1580109940/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 60.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 3 months |
| Monetization | Free | — |
| Size | 93 MB | 79 MB |
| Requires iOS | **12.0** | 13.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [TAKE ACTION GLOBAL Inc](https://appshunter.io/developer/1580109942) | [66 ORIGIN](https://appshunter.io/developer/1547250216) |

## What reviewers say

### EarthProject

[App page](https://appshunter.io/ios/app/earthproject/id1580109940)

Learn and get motivated to reduce your carbon and plastic footprint. This educational app provides tools and encouragement for sustainable living.

**Highlights:** Learn waste reduction techniques, Motivation for sustainable living, Carbon footprint tracking, Plastic waste reduction guidance, Educational content

**Features:** macOS Compatibility

**In-app purchases:** none


### Memstar Book

[App page](https://appshunter.io/ios/app/memstar-book/id6480310013)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is EarthProject free?

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

### Is Memstar Book free?

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

### Do EarthProject or Memstar Book have ads?

Neither EarthProject nor Memstar Book shows ads.

### Which is updated more often, EarthProject or Memstar Book?

EarthProject ships an update every 3 weeks, and Memstar Book every 3 months. Most recently, EarthProject was updated on June 1, 2026 and Memstar Book on December 3, 2025.

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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.*