Walking! Earth Defense Force vs Deep Sky Diary
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Walking! Earth Defense Force
Walk to earn in-game currency and acquire villains to defend Earth. Develop equipment and expand your organization to restore peace. A casual patrol game with a compelling story.
- Earn in-game currency with steps
- Acquire aliens and villains
- Develop equipment
- Extend organization
- Casual patrol gameplay
- Engaging storyline
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Defend the Earth from the Mysterious Aliens and Villains! This application is a game that walks and protects the Earth. Earn "Steps" and get Aliens and Villains! Acquire "Fame" and extend the organization! Equipments and merchandise are developed by "Invention Seeds"! Let's take back peace in the Earth by casual patrol ! [ STORY ] A.D. 20XX. Mysterious aliens attack the earth. People were exposed to the threat of sent combatants ‘Villains’. One day. Mr. Akechi and dying Yuzu-Pon have asked help from you. They established the Earth Defense Force to protect people from the threats of aliens and Villains with your cooperation.
Deep Sky Diary
Record your thoughts and memories for your future self or send messages into the void. This app allows you to create regular diary entries, schedule future readings, or send messages that are permanently deleted.
- Regular diary entries
- Scheduled future readings
- Ephemeral black hole messages
- Optional black hole receipt
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Sometimes, you probably want to talk to your "future self", and sometimes, you probably want to just talk to nowhere. Deep Sky Diary is here for you. - Keep regular diaries - Write diaries for future you: set a date and read the diary after that day. - Write a diary and send it to the black hole (nowhere) * *: The message will be discarded and not saved on your local device. If you choose to save a receipt, a story with the title "Blackhole Receipt" will be saved.
Screenshots
Verdict
The clearest difference is ads: Deep Sky Diary at none against Walking! Earth Defense Force's shown. Deep Sky Diary also leads on update cadence (every 3 days vs every 5 weeks) and monetization model (free vs ad-supported). Walking! Earth Defense Force's advantage is ratings volume (7 vs 2). On price, rating 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 4.9 for Walking! Earth Defense Force against 5.0 for Deep Sky Diary. Both are backed by a comparable volume of ratings — 7 and 2 respectively.
Walking! Earth Defense Force ships an update every 5 weeks, Deep Sky Diary every 3 days. The most recent releases landed on October 24, 2026 and October 11, 2026 respectively.
| Parameter | Walking! Earth Defense Force | Deep Sky Diary |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (7 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 45.5% of reviews | — |
| Number of ratings | 7 — better | 2 |
| Update frequency | Every 5 weeks | Every 3 days — better |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Ad-supported | Free — better |
| Devices | iPhone | iPhone, iPad, iPod — better |
| Requires iOS | 18.6 | 14.1 — better |
| Further details — not scored | ||
| Size | 56 MB | 8 MB |
| Age rating | 4+ | 4+ |
| Developer | Tomoya Hasegawa | Shunzhe Ma |
Customer experience
Walking! Earth Defense Force
Deep Sky Diary
In-app purchases
Walking! Earth Defense Force
No in-app purchases
Deep Sky Diary
No in-app purchases
Questions
Is Walking! Earth Defense Force free?
Is Deep Sky Diary free?
Which has better reviews, Walking! Earth Defense Force or Deep Sky Diary?
Do Walking! Earth Defense Force or Deep Sky Diary have ads?
Which is updated more often, Walking! Earth Defense Force or Deep Sky Diary?
Other comparisons
