マイメダカ日記 vs JoyFish
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
マイメダカ日記
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「マイメダカ日記」は、メダカの飼育日記を簡単に書いて公開できるWebサービスです。「メダカのおうち」で提供しているもので、簡単に日記を書いて公開できます。「マイメダカ日記」アプリは、スマートフォンでより簡単にサービスを利用できるようになっています。日記を書こうと思ったその時に、簡単に投稿できます。
JoyFish
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The JoyFish (You are not a fish, how can you know the joy of fish?) is an iOS app designed specifically for aquarium enthusiasts, aimed at helping users record and track the growth and daily activities of their beloved fish. With this app, you can easily manage feeding and health screenings for your fish. You can also manage other aspects such as water quality and cleanliness of the tank, and enjoy the fun of recording the growth of your fish, witnessing every irreplaceable moment. Fish Joy offers a simple and intuitive interface with practical features, making fish care easy and fun. The activity log feature in the app helps you record the daily activities of your fish in detail, allowing you to better understand and optimize their living environment and health condition. The product has just been launched and hopes to receive feedback from fellow fish enthusiasts. If you have any comments or suggestions, feel free to contact me in various ways. I hope everyone can feel the joy of fishkeeping and experience the joy of life while using it. Current Main Features: Manage and record small fish and their activities Manage and record tank and tank activities Notifications for various types of activities Themes, category tags, and other settings User Rights: The basic version currently has some restrictions on entry recording, but other features are the same as the premium version. In-App Purchase: Payment will be charged to your Apple ID account at the confirmation of purchase. Subscription automatically renews unless it is canceled at least 24 hours before the end of the current period.Your account will be charged for renewal within 24 hours prior to the end of the current period. You can manage and cancel your subscriptions by going to your account settings in the App Store after purchase. Email jiangdi0924@gmail.com Terms: https://jdi-app.notion.site/Terms-5a99ba5bf942491b8299c07221bb5f7b Privacy: https://jdi-app.notion.site/Privacy-Policy-cdb1be6b87f64c06b7dbea6ffbbad83f
Screenshots
Verdict
The clearest difference is in-app purchases: マイメダカ日記 at none against JoyFish's 2. マイメダカ日記 also leads on device support (3 vs 1) and iOS requirement (10.0 vs 17.0). JoyFish's advantage is update cadence (monthly vs every 11 months). On price and ads 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. JoyFish sells 2 in-app purchases, starting at $0.99 per month. マイメダカ日記 asks for nothing beyond the download.
マイメダカ日記 ships an update every 11 months, JoyFish monthly. The most recent releases landed on October 26, 2026 and November 5, 2026 respectively.
| Parameter | マイメダカ日記 | JoyFish |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 11 months | Monthly — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 10.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 13 MB | 8 MB |
| Age rating | 4+ | 4+ |
| Developer | Satoru Nakamura | 笛 姜 |
In-app purchases
マイメダカ日記
No in-app purchases
JoyFish
- Monthly Premium$0.991 Month
- Lifetime Premium$3.99









