ゼロカーボン・チャレンジ vs X
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ゼロカーボン・チャレンジ
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2025年4月~10月まで開催された大阪・関西万博を“きっかけ”に、個人の脱炭素行動を促すことを目的とした後継アプリです。万博のレガシーを引継ぎ個人のライフスタイルの転換を目指していきます。ひとりひとりが楽しみながら脱炭素な行動をすることでポイントが貯まり、そのポイントを利用することで景品の抽選に応募できます。 ちょっとした脱炭素行動を日常にプラスしてポイントを獲得し、貯めたポイントで景品抽選に参加しませんか? ~ゼロカーボンチャレンジアプリで日常生活に脱炭素とワクワクを~ 【ゼロカーボンチャレンジアプリに取り組むことでポイントをゲット】 アプリ内に設定されている「マイボトル」や「家庭系廃食用油の回収」等のチャレンジに取り組むことで、ポイントがゲットできます。 【貯めたポイントで景品抽選に参加】 チャレンジを実施して貯めたポイントで、景品抽選に参加することができます。
X
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"X-Year Diary" is a privacy-first memory app that lets you look back on your "on this day" posts using your downloaded X (formerly Twitter) archive data. What were you thinking or doing on this exact day 1, 3, or 5 years ago? Rediscover forgotten moments and memories effortlessly every day. 【Key Features】 ◆ Automatic "On This Day" Throwbacks Simply import your downloaded X archive, and the app automatically filters and displays posts you created on this exact date across past years. ◆ Privacy Guaranteed (On-Device Processing) Imported data is processed and displayed locally on your device and is never uploaded or saved to any external servers (excluding standard network requests to retrieve media content). Your personal archive remains completely private to you. ◆ Clean & Familiar Interface Designed with a intuitive layout, making it smooth and easy to scroll through your past posts and likes. 【How to Use】 Go to X (x.com) > Settings and privacy > "Download an archive of your data" to request and download your archive ZIP file. Open this app and import the downloaded ZIP file (or extracted JS file). Enjoy revisiting your past memories every single day!
Screenshots
Verdict
The clearest difference is update cadence: X at weekly against ゼロカーボン・チャレンジ's monthly. On price, ads, in-app purchases and device support 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.
ゼロカーボン・チャレンジ ships an update monthly, X weekly. The most recent releases landed on November 4, 2026 and November 6, 2026 respectively.
| Parameter | ゼロカーボン・チャレンジ | X |
|---|---|---|
| Price | Free | Free |
| Rating | 1.0 (1 ratings) — better | — |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Monthly | Weekly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 15.0 — better |
| Further details — not scored | ||
| Size | 29 MB | 29 MB |
| Age rating | 12+ | 12+ |
| Developer | JAPAN ZERO CARBON SMART CITY FOUNDATION, GENERAL INC. ASSOCIATION - AXFG5J98TW | SHINYA KUDO |
In-app purchases
ゼロカーボン・チャレンジ
No in-app purchases
X
No in-app purchases








