Comparison

GroundZERO! vs Prolog Retro Notes

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

GroundZERO!

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
Read full description

Launch missiles to exterminate mankind! Rhythm and simulation combined in one!

About

Prolog Retro Notes

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
Read full description

_______________________________ Do you like retro graphics? ▼ Yes No _______________________________ For those who answered yes! Annotepad app that incorporates the nostalgic feeling of those days and reproduces the world has been born!! It's an app to remember the excitement of that day when your heart swelled with adventure into an unknown world. Today as well, let's choose a save data and head to the forest of sentences... In this memo app, you can record: - Memos - Playtime (editing time) - Level (varies depending on the amount of text) - Photos Let's level up and create great save data!! We paid special attention to the world view. We hope it can be of some use in your memo life. [Premium Service] ■ Unlocked Features - Hide in-app ads - Record photos - Unlock the record limit - Passcode lock function ■ Duration It will automatically renew every month starting from the application date. It will be charged to your iTunes account. ■ About Automatic Renewal You can stop automatic renewal if it is more than 24 hours before the end of the registration period. Automatic renewal procedures will be conducted from 24 hours before the end of the registration period. ■ Confirmation and Cancellation App Store App -> User icon at the upper right of the ToDay tab -> Subscription You can unsubscribe and set automatic renewal and check the update date here. ■ Notes - Automatic renewal of the premium plan cannot be canceled from within the app. - You will be charged to your iTunes account. - Cancellation for the current month is not accepted. ■ Terms of Use and Privacy Policy We will not provide information that can identify individuals to third parties. We manage personal information with great care and handle it as follows. - Support Correspondence No information that can identify individuals will be sent in support emails. - Details Link https://note.com/kojiro79/n/n7c8899db1c9b ■ Disclaimer We will do our best to support any problems or inconveniences in use, but the developer will not be held responsible for any damages caused by the user through this app. ----- Thank you for reading to the end! All reviews are read by the developer himself, and I always get energy from them. I also think about functions based on what you write in your review, so I would be happy if you could write a review when you have time! We will continue to update the app to make it comfortable for everyone, so please support us!

Screenshots

GroundZERO!3 screens
Prolog Retro Notes1 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard4 real differences · 6 level
GroundZERO! versus Prolog Retro Notes: the parameters behind the verdict, then further details
ParameterGroundZERO!Prolog Retro Notes
PriceFreeFree
Rating2.3 (3 ratings)5.0 (5 ratings) — better
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings35 — better
Update frequencyEvery 8 days — betterEvery 9 months
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPodiPhone, iPod
Requires iOS8.0 — better14.0
Further details — not scored
Size28 MB38 MB
Age rating12+4+
DeveloperRyo Shirakawayasuhiro kojima

Customer experience

GroundZERO!

All ratings3 ratings
Positive33.3%
Neutral0.0%
Negative66.7%
Written reviews3 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Prolog Retro Notes

All ratings5 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews4 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

3 purchases

GroundZERO!

One-time3
  • Gold Missile + 3$0.99
  • Gold Missile + 7$1.99
  • Gold Missile + 12$2.99
1 purchases

Prolog Retro Notes

Subscriptions1
  • Premium plan$0.991 Month

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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