ゼロカーボン・チャレンジ vs Takamaru
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。
Takamaru
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Takamaru is more than a countdown. It is a calm space to move toward something that matters. Choose a date. Add a title. Select an image that represents what you are waiting for. From that moment on, each day reveals one small piece of your image. One day. One piece. Behind a clean, structured grid lies your chosen picture. As time passes, the grid slowly opens. What was hidden becomes visible — step by step. Takamaru is built on a simple idea: Anticipation grows. Instead of watching numbers drop to zero, you experience progress visually. Each day brings you closer. Each day reveals a little more. Features: - Countdown to one meaningful date - Custom title and personal image - Daily image reveal through a minimal grid - Remaining days at a glance - Home and Lock Screen widgets - Apple Watch app with complications - Optional daily reminders Each grid cell represents one calendar day. The logic remains stable across time zones and daylight saving changes. If you skip a few days, the app catches up automatically. Takamaru is calm. It does not rush you. It lets anticipation rise — day by day. Takamaru – Waiting that grows.
Screenshots
Verdict
The clearest difference is in-app purchases: ゼロカーボン・チャレンジ at none against Takamaru's 2. ゼロカーボン・チャレンジ also leads on iOS requirement (15.6 vs 18.6). Takamaru's advantage is update cadence (every 4 days vs monthly). On price, ads 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. Takamaru sells 2 one-off in-app purchases. ゼロカーボン・チャレンジ asks for nothing beyond the download.
ゼロカーボン・チャレンジ ships an update monthly, Takamaru every 4 days. The most recent releases landed on November 4, 2026 and October 31, 2026 respectively.
| Parameter | ゼロカーボン・チャレンジ | Takamaru |
|---|---|---|
| Price | Free | Free |
| Rating | 1.0 (1 ratings) — better | — |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Monthly | Every 4 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Requires iOS | 15.6 — better | 18.6 |
| Further details — not scored | ||
| Size | 29 MB | 16 MB |
| Age rating | 12+ | 4+ |
| Developer | JAPAN ZERO CARBON SMART CITY FOUNDATION, GENERAL INC. ASSOCIATION - AXFG5J98TW | Daniel Kirstenpfad |
In-app purchases
ゼロカーボン・チャレンジ
No in-app purchases
Takamaru
- Individual Lifetime$1.99
- Family Lifetime$3.99









