# GroundZERO! vs Prolog Retro Notes

The clearest difference is rating: Prolog Retro Notes at 5.0 against GroundZERO!'s 2.3. GroundZERO!'s advantage is ads (none vs shown) and update cadence (every 8 days vs every 9 months). On price, review sentiment, ratings volume and in-app purchases there is nothing between them.

Both are free to download. GroundZERO! sells 3 one-off in-app purchases and Prolog Retro Notes sells 1 in-app purchase, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

Prolog Retro Notes holds the better App Store score, 5.0 against 2.3. Both are backed by a comparable volume of ratings — 3 and 5 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

GroundZERO! ships an update every 8 days, Prolog Retro Notes every 9 months. The most recent releases landed on October 3, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | GroundZERO! | Prolog Retro Notes |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.3 (3 ratings)](https://appshunter.io/ios/app/groundzero/id900284870/reviews) | **[5.0 (5 ratings)](https://appshunter.io/ios/app/prolog-retro-notes-8-bit-memo/id6468677672/reviews)** |
| Number of ratings | 3 | **5** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 8 days** | Every 9 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 28 MB | 38 MB |
| Requires iOS | **8.0** | 14.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Ryo Shirakawa](https://appshunter.io/developer/1381279784) | [yasuhiro kojima](https://appshunter.io/developer/1244729145) |

## What reviewers say

### GroundZERO!

[App page](https://appshunter.io/ios/app/groundzero/id900284870)

Engage in a unique blend of rhythm and simulation gameplay. Launch missiles to achieve a global objective. Experience a distinctive approach to entertainment.

**Highlights:** Rhythm gameplay, Simulation elements, Missile launching mechanics, Global extermination objective

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Gold Missile + 3 | $0.99 | one-time |
| Gold Missile + 7 | $1.99 | one-time |
| Gold Missile + 12 | $2.99 | one-time |


### Prolog Retro Notes

[App page](https://appshunter.io/ios/app/prolog-retro-notes-8-bit-memo/id6468677672)

This app offers a unique note-taking experience with a retro 8-bit aesthetic. It allows users to record memos, track editing time, and even attach photos, all within a nostalgic, game-like interface. Level up your notes and enjoy a blast from the past.

**Highlights:** Retro 8-bit graphics, Memo recording, Playtime tracking, Level-based text progress, Photo attachment, Passcode lock (premium)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium plan | $0.99 | per month |


## Frequently asked questions

### Is GroundZERO! free?

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

### Is Prolog Retro Notes free?

Prolog Retro Notes is free to download, with in-app purchases available.

### Which has better reviews, GroundZERO! or Prolog Retro Notes?

Prolog Retro Notes is rated higher. GroundZERO! averages 2.3 out of 5 from 3 ratings, while Prolog Retro Notes averages 5.0 from 5 ratings.

### Do GroundZERO! or Prolog Retro Notes have ads?

Prolog Retro Notes shows ads; GroundZERO! does not.

### Which is updated more often, GroundZERO! or Prolog Retro Notes?

GroundZERO! ships an update every 8 days, and Prolog Retro Notes every 9 months. Most recently, GroundZERO! was updated on October 3, 2026 and Prolog Retro Notes 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.*